Reseller Carrier Preselection List
Version 142 - 26th February 2010
Not for commercial publication or use.
Permanent Carrier Pre-Selection is now available from BT, which means that's smartboxes and indirect access codes may be ignored because an Other Licensed Operator can now arrange with BT for all local, national, international NTS, mobile, page and personal calls to be 'diverted' without needing to dial any extra codes (different types of call may be routed to different OLOs) . If CPS is set-up, indirect codes may still be dialled to use alternate operators or to use BT (code 1280). CPS can be supplied on single or multiline PSTN or ISDN lines.
This list is compiled from information published by Ofcom and has not been checked by Magenta Systems.
A CPS guide is available from Ofcom.
| Communications Provider | Brand Name | Contact Address | Telephone |
| (aq) Ltd T/A aql | aql | 13-15 Hunslet Road Leeds LS10 1JQ | 0870 744 9227 |
| 08 Numbers Ltd | 08 Numbers Ltd | 100 Mount Pleasant Westerham KENT TN16 3TR | 0800 848 800 |
| 1 Telecom Ltd | |||
| 10 Telecom Ltd | |||
| 118 Group Ltd | 118 Group Ltd | 87 Waterhouse Business Centre Cromar Way Chelmsford Essex CM1 2QE | 01245 392172 |
| 121 Comms Ltd | 121 Comms Ltd | Newham Farm 5 Wales Street Rothwell Northants NN14 6JL | 08452 720 121 |
| 123Telecom Ltd | 123Telecom | 305 Vale Enterprise Centre Hayes Road, Sully Vale of Glamorgan CF64 5SY | 0870 871 0123 |
| 127 Solutions Ltd | 127 Solutions Ltd | Chatham House Dee Hills Park Chester CH3 5AR | 0845 8621 127 |
| 1st Advance Ltd | |||
| 1st Call Communications Ltd | 1st Call Com Ltd | Station House 6a Station Road Eckington Sheffield South Yorkshire S21 4FX | 01246 439 800 |
| 1st Connect Group Ltd | 1st Connect Group Ltd | 46 Cobham Road Ferndown Industrial Estate Dorset BH21 7QG | 01202 850 000 |
| 200connect Ltd | 200connect Ltd | 45 Weale Road London E4 6JL | 020 3411 5345 |
| 21 Next Gen Ltd | Orbit Talk | Unit 4 1 Oakwood Road Sparkhill Birmingham B11 4EX | 0871 971 0056 |
| 21 Plus Telecom Ltd | 21 Plus | Evans Business Centre Manchester Road Bolton BL3 2PY | 01204 368 636 |
| 21ip Ltd | 21ip | 8 North Hills Brill Aylesbury Bucks HP18 9TH | 01844-239750 |
| 21st Century Telecom.com Ltd | 21st Century Telecom.com Ltd | 23 Gaolgate Street Stafford ST16 2NT | 0870 777 2121 |
| 24 by 7 Communications Ltd | |||
| 24Talk | 24Talk | Unit 25, City Business Centre 6 Brighton Road Horsham West Sussex RH13 5BB | 0845 345 2889 |
| 360 Solutions (UK) Ltd | 360 Solutions Network Services | 360 House Newborough Road Needwood DE13 9PD | 0845 223 6360 |
| 360CRM Ltd | 360CRM | 2 Cockburn Place Irvine KA11 5DA | 01294 316504 |
| 365 Telecom Ltd | |||
| 3C Telecom | 3C Telecom | 67 Manor Road Romford Essex RM1 2RD | 0870 750 7088 |
| 3g Comms Ltd | 3g Landline | Cuckoo Wharf 427 Lichfield Road Aston, Birmingham B6 7SS | 0121 328 8444 |
| 3Mi Ltd | |||
| 3R Net Ltd | 3RNet | PO Box 42599 Wapping High Street London E1W 3LA | 0870 1748570 |
| 3R Telecom Ltd | 3R BUZZ | 28 Lindsey Street Epping Essex CM16 6RD | 01992 564644 / 07958 562413 |
| 4 Business Calls Ltd | 4 Business Calls Ltd | 282 Heywood Old Road Middleton Manchester M24 4QG | 0807 300 4299 |
| 4 Networks Ltd | 4 Networks Ltd | 95 Manchester Road Rochdale, Lancashire OL11 4JG | 0870 906 0066 |
| 42 Com Telecommunication Gmbh | 42com | Friedrichstrabe 231 D-10969 Berlin Germany | +49 (0)30-340 605 907 |
| 4Com Ltd | |||
| 4Com Network Services LLP | 4Com Network Services Ltd | 4Com House 2 Watt Road, Churchfields Sailsbury Wiltshire SP2 7UD | 0870 777 0700 |
| 4most Solutions LLP | 4most Solutions LLP | Boxhill Cottage Dorking Surrey RH5 6BS | 0870 111 0700 |
| 4Net Technologies Ltd | 4Net Technologies Ltd | Maclaren House Talbot Road Manchester M32 0FP | 0845 055 6366 |
| 4Sight UK Ltd | Freeman Telecom | 8 Anker Lane Fareham Hampshire PO14 3HF | 07866 564 021 |
| 4SQR | 4SQR | 92 Margate Road Herne Bay KENT CT6 7BJ | 0870 2247424 |
| 4tech Connect Ltd | 4tech Connect Ltd | 38 Morgan Way Bowthorpe Industrial Estate Norwich , Norfolk NR5 9JJ | 0870 167 2265 |
| 4tel Communications Ltd | 4tel Connect | Penstraze Business Centre Truro TR4 8PN | 0800 505 3210 |
| 4theNet Internet Ltd | 4theNET Call | The Old Bakery 61 High Street Rottingdean BN2 7HE | 0870 740 1619 |
| 4ward Communications | 4ward Communications | Unit G35 Hastingwood Trading Estate Harbet Road LONDON N18 3HT | 08700 411 005 |
| 5 Rings Telecom Ltd | 5 Rings Telecom Ltd | Findale House 151 Findon Road Worthing West Sussex BN14 0BQ | 0845 680 1555 |
| 5miles Communications Ltd | 5miles Communications Ltd | 67 London Road Bognor Regis West Sussex PO21 1DF | 08452 249 041 |
| 6 Communications Ltd | 6Comms | 6 Communications Ltd 2nd Floor 145-157 St John Street London EC1V 4PY | 08456 525603 |
| A4 IT Services Ltd | A4 IT Services Ltd | 54a Church Road Ashford Middlesex TW15 2TS | 08700 634 283 |
| AAC Services Ltd | AAC Services Ltd | Manton Lane Bedford Beds MK41 7TL | 01234 227 788 |
| Abacus Lloyd Ltd | Abacus Lloyd Communications | Daws House 33-35 Daws Lane London NW7 4SD | 08444 821 482 |
| Abica Ltd | abc | 72 Elderslie Street Glasgow G3 7AL | 0845 373 3622 |
| Abjak Ltd | Abjak Ltd | Unit 1a, Sovereign House Bramhall Village Centre Bramhall Stockport SK7 1BD | 07710 695006 |
| Abrient Ltd | Abrient Ltd | The Old Smithy Bath Road Oakhill Somerset BA3 5AQ | 01749 841525 |
| Absolute Numbers Ltd | Absolute Numbers Ltd | Forum House Stirling Road Chichester West Sussex PO19 7DN | 08454 501910 |
| Abtec Services UK Ltd | Abtec Communications | Quarry House Mill Lane Uckfield, East Sussex TN22 5AA | 0870 777 7030 |
| Abycom International Ltd | Abycom International Ltd | 7 Long Road Canvey Island Essex SS8 0JA | 01268 660600 |
| Abycom Ltd | Abycom Ltd | Daisy House Lindread Road Business Park Nelson Lancs BB9 5SR | 08456 777888 |
| Accent Telecom UK Ltd | Accent Telecom UK Ltd | PO Box 328 Witney OX28 1ZR | 0870 950 1630 |
| Access Telecommunications Retail Ltd | |||
| ACN European Services Ltd | ACN | ACN European Services Ltd AMS/AMS/136762/AUK PO. Box 66 Hounslow TW5 9RT | 0800 331 60 07 |
| Acomys Ltd | Acomys Ltd | 2 Church Street Wiveliscombe Taunton TA4 2LR | 01984 678 150 |
| Acorn Networks Services Ltd | Acorn Networks Services | Acorn House 5 French Place London E1 6JB | 020 7643 5900 |
| ACR Networks Ltd | |||
| ACT (Comms) Ltd | ACT | Hexagon House 71 Lower Road Kenley Surrey CR8 5NH | 08707 74 75 76 |
| Actimax PLC | Actimax plc | 1 Yardley Business Park Luckyn Lane Basildon Essex SS14 3GL | 01268 243 903 |
| Activ Communications | |||
| Active Comm.Solutions | |||
| Activtelecom Ltd | Activtelecom Ltd | 3 Atley Way North Nelson Industrial Est Cramlington Northumberland NE23 1WA | 0870 7871161 |
| Acuity Networks Ltd | Acuity Networks Ltd | Old Vicarage Market Street Castle Donington DE74 2JB | 03333 440 801 |
| ADA Networks Ltd | ADA StreamNET | 3 Mill Court Mill Lane Newbury Berks RG14 5RE | 01635 523131 |
| Adam Phones Ltd | |||
| adapt | IP Voice | 142-148 Goswell Road London EC1V 7DU | 020 7324 3700 |
| Adaptive Communication Solutions Ltd | Twenty First | 72 King Street Southport PR8 1LG | 0800 634 8889 |
| Add Communications Ltd | Yourtel | 27 Fishergate Hill Preston PR1 8JB | 0845 225 6006 |
| AdEPT Telecom | AdEPT Telecom | Customer Service 77 Mount Ephraim Tunbridge Wells, Kent TN4 8BS | 0870 190 9100 |
| AdEPT Telecom | Adept Telecom-Admiral | 77 Mount Ephraim Tunbridge Weels Kent TN4 8BS | 0870 190 9125 |
| ADK Communications | ADK Communications Ltd | 7a The Maltings Railway Place Hertford Herts SG13 7JT | 0845 345 9212 |
| Admiral Managed Networks | Admiral Managed Networks Ltd | Victory House Chobham Street Luton Beds LU1 3BS | 0870 330 7500 |
| Admiral Voice and Data Ltd | Admiral Voice and Data Ltd | Victory House Chobham Street Luton Bedfordshire LU1 3BS | 01582 557 925 |
| Adodo Communications Ltd | Adodo | The Howitt Building Lenton Boulevard Nottingham NG7 2BG | 0800 092 1471 |
| ADP Dealer Services UK Ltd | ADP Dealer Services Ltd | Herongate Charnham Park Hungerford RG17 0YU | 0845 30 31 300 |
| ADP Dealer Services UK Ltd | ADP Talk | Herongate Charnham Park Hungerford Berkshire RG17 0YU | 01635 523456 |
| Adtrak Services Ltd | Adtrak Services Ltd | Wayside 1 Hallfields Edwalton Nottingham NG12 4AA | 0800 542 0116 |
| Advance Network Services Ltd | |||
| Advancz Telecommunications Ltd | Advancz | 60 Bagley Lane Farsley Leeds LS28 5LY | 0870 0666 308 |
| Advantage Cellular Communications Ltd | Advantage Cellular Communications Ltd | Advantage House 3a Churchward Didcot Oxfordshire OX11 7HB | 0844 264 0300 |
| Advantage Telecom Ltd | Advantage Telecom | 164 Kensington High Street Kensington London W8 7RG | 0844 372 3460 |
| Aerofone (UK) Ltd | Aerofone | Aerofone (UK) Ltd Manton Lane Bedford MK41 7TL | 0845 330 7700 |
| Affinicom Ltd | Affinicom Ltd | Leeds Farm House Poplar Road Wittersham KENT TN30 7NT | 01797 270 441 |
| Affiniti Integrated Solutions Ltd | Affiniti | Customer Service Front Desk Melbourne House Brandy Carr Road Wrenthorpe, Wakefield WF2 0UG | 0800 138 48 58 |
| Affordable Digital Solutions Ltd | Affordable Digital Solutions Ltd | Tong Hall Tong Village Bradford BD4 ORR | 0870 6098041 |
| Afrigate Ltd | 21st Century Telecoms Ltd | Old Dominion House Gravel Hill Henley-on-Thames Oxfordshire RH9 2EG | 01491 637857 |
| Aggregated Telecom Ltd | 8elCPS | Aggregated Telecom Prophecy House 87 London Street Reading RG1 4QA | 0118 955 0800 |
| Agile Communications Ltd | Agile Communications Ltd | Qnet House Malleable Way Stockton-On-Tees TS18 2QX | 0871 700 4790 |
| AIC Telecom (UK) Ltd | AIC Telecom (UK) Ltd | 1st Floor 12-13 Little Newport Street London WC2H 7JJ | 0207 437 7123 |
| Air Net Services Ltd | Air Net Services Ltd | 62 St Philips Road Keyingham Hull HU12 9TD | 0800 916 8570 |
| Airmart Ltd | Cortel | 32 Shoreditch High Street London E1 6PG | 020 7247 0101 |
| Airphone Telecom Ltd | |||
| Airtime Express Ltd | |||
| AIS Communications Ltd | AIS Comms Ltd | Unit 3 The Redlands Centre Redlands Coulsdon CR5 2HT | 0845 4605000 |
| AJ Business Solutions Ltd | AJ Business Solutions | 16 Browning Street Stafford ST16 3AX | 08707 518 900 |
| Alban Telecom Ltd | Alban Telecom Ltd | The John Dickinson Enterprise Centre London Road Hemel Hempstead Hertfordshire HP3 9QU | 0845 0654 321 |
| Albion Computers Plc | Albion Computers Plc | 112 Strand London WC2R 0AG | 020 7212 9090 |
| Alcami Business Service Ltd | |||
| Alchemist Technologies Ltd | Alchemist Communications | Alchemist House Brownrigg Loaning Dumfries DG1 3JU | 01387 269 888 |
| Alertacall Ltd | Alertacall | Pit Farm Farmhouse Haggs Lane Cartmel Grange-Over-Sands LA11 6HE | 0845 094 5201 |
| Alertacall Ltd | Really Easy Calls | Pit Farm Farmhouse Haggs Lane Cartmel Grange-Over-Sands LA11 6HE | 0845 094 5201 |
| Alertacall Ltd | Whitefuse | Pit Farm Farmhouse Haggs Lane Cartmel Grange-Over-Sands LA11 6HE | 0845 094 5201 |
| Alfred Ashley Technical Services Ltd | Alfred Ashley Technical Services Ltd | (Business Phone Systems) 38 High Street Northwood Middlesex HA6 1BN | 08708 711 003 |
| Allcomm Communications Ltd | Allcomm Communications Ltd | 8-10 Compton Road Wolverhampton London WV3 9PH | 0845 8506107 |
| Allcooper Ltd | Allcooper Ltd | Connect Division 7 Hucclecote Road Gloucester GL3 3TQ | 01452 565 758 |
| Allenwood Enterprises Ltd. | smalltalk communications | Bourne House Milbourne Street Carlisle Cumbria CA2 5XF | 01228 635554 |
| Alliance Bell Communications Ltd | Alliance Bell Communications Ltd | BCR House Bredbury Business Park Stockport Chesire SK6 2SN | 08456 730 011 |
| Alliance Communication Solution Ltd | Alliance Communication Solution Ltd | Milton Heath House Westcroft Road Dorking, Surrey RH4 3NB | 0870 770 7370 |
| Alliance Communications Ltd | Alliance Communications Ltd (ACL) | Towerhurst Church Road Leigh Woods Bristol BS8 3PG | 0870 300 2022 |
| Alliance Communications Ltd | Tube Telecom | Towerhurst Church Road Leigh Woods Bristol BS8 3PG | 0870 300 2022 |
| Allied Network Services Ltd | Thus Plc | 1-2 Berkeley Square 99 Berkeley Street Glasgow G3 7HR | 0141 567 1234 |
| Alpha Business Communications Ltd | AlphaNet | Network Centre High Carr Business Park Newcastle-Under-Lyme Staffordshire ST5 7XE | 01782 576 000 |
| Alpha Overseas International Telecommunications Services Ltd (AOITSL) | Alpha Communications | 75 route de Longwy LU 8080 Bertrange Luxembourg | 0845 085 0250 |
| Alphatalk Ltd | |||
| Alternative Networks | Alternative Networks Ltd | Chatfield Court 56 Chatfield Road London SW11 3UL | 0800 816 8866 |
| AlwaysOn Ltd | AlwaysOn | 1 Napier Court Napier Road Reading RG1 8BW | 0845 241 8300 |
| AM Telecom Ltd | AM Telecom | Radclyffe House 66-68 Hagley Road Birmingham B16 8PF | 0121 456 3273 |
| Amcall Communications Ltd | |||
| Amerada Telecom | |||
| AMG Computer Services LTD | Efuse | AMG Computer Services LTD Unit 26 Winders Way Salford M6 6AR | 0844 8479707 |
| Amillan Ltd | Amillan Ltd | Connection House 3 The Parkway Centre Heneage Street Birmingham | 0121 260 8100 |
| Ampito Ltd | Matelco | 1 Farnham Road Guildford Surrey GU2 4RG | 0870 352 1004 |
| Andrews & Arnold Ltd | AAISP | Enterprise Court Downmill Road Bracknell RG12 1QS | 01344 400 009 |
| Angel Networks Ltd | |||
| Anglia Telecom Centres Plc | |||
| Anglo Telecom | |||
| ANH COMMUNICATIONS LTD | |||
| Annodata Business Communications | |||
| AOL Europe Services SARL | AOL | IDA Business Park Cork Road Waterford Ireland | 0800 376 5432 |
| Aonix (UK) Ltd | Aonix Connect Services | Select House Popes Lane Oldbury West Midlands B69 4PA | |
| APC Data Installations Ltd | APC Data | Bradstowe House Whitstable Kent CT5 1BF | 01227 774 850 |
| Appleacre Communications | Rocket Connect | Communications House 3-5 Aleandra Terrace Alexandra Road Alderhot GU11 3HU | 01252 669 220 |
| Applegarth Communications Ltd | Applegarth Communications Ltd | 375 Meanwood Road Leeds LS7 2LL | 0113 2441442 |
| Applica | applicahome | Willowbank House 84 Station Rd Marlow Bucks SL7 1NX | 0870 164 993 |
| Applied Voice and Data Solutions | Applied Voice and Data Solutions | Cathedral House 23/31 Waring Street Belfast BT1 2DX | 028 9043 6618 |
| Applinet Plc | Applinet Network Services | Unit 14, Thatcham Business Village Colthrop Way Thatcham Berkshire RG19 4LW | 01635 848900 |
| Appollo Ltd | Appollo Ltd | 9 Leasowe Close Great Haywood Stafford ST18 0RR | 08442 459123 |
| APT - Information & Communication Technologies Ltd | APT-ict | 1st Floor Offices, Haslemere Stn Lower Street Haslemere Surrey GU27 2PE | 08445 449 450 |
| Aquanet Communications Ltd | Aquanet Communications Ltd | Bredbury Parkway Stockport SK6 1SB | 0844 88 00 770 / 07595 043552 |
| Ardencom Ltd | Ardencom Ltd | Wellington House Starley Way Birmingham Int. Park Solihull B37 7HE | 0870 264 6465 |
| Arkadin UK Ltd | ARKADIN UK LTD | 26-28 Hammersmith Grove LONDON W6 7JA | 020 8742 6398 |
| Arkenis UK Ltd | Arkenis-Talk-Time | Arkenis House Brook Way Leatherhead Surrey KT24 7NA | 01372 204700 |
| Armstrong Bell Ltd | Armstrong Bell Ltd | Office 13, Greenbox Westonhall Road Stoke Prior Bromsgrove B60 4AL | 0845 050 5757 |
| Armstrong Bell Ltd | Armstrong Bell Ltd | Suite 1, Winwood Court Norton Road Stourbridge West Midlands DY8 2AE | 0845 0719444 |
| Armstrong Communications Plc | Armstrong Communications Plc | 4 Cody Court Kansas Avenue Salford Manchester M50 2GE | 0161 868 3003 |
| Arrow Communications Direct Ltd | Arrow Communications Direct Ltd | 102C Bancroft Hitchin Herts SG5 1NB | 01462 441 445 |
| Arrow Mobile Communications Plc | Arrow | Marine House Morton Peto Road Great Yarmouth Norfolk NR31 0LT | 01493 663 132 |
| Ashgoal Ltd | Ashgoal Ltd | Unit C, Queens Road Barnet Herts EN5 4DJ | 020 8275 5100 |
| Aspect International Telecoms Ltd | Aspect | Claredon House High Street Stockbridge SO20 6EY | 0845 634 5566 |
| Assembly Global Networks Ltd | Assembly Global Networks | 45 Conduit Street London W1S 2YN | 0844 871 8430 |
| Assuract Ltd | Access21 | 258 Belsize Road 26 York Road London NW6 4BT | 0333 240 0621 |
| Assure Telecom | Assure Telecom | 131 Stooperdale Avenue Darlington Co Durham DL3 0UD | 08701 903 060 |
| Ast Networks Ltd | AST Networks Ltd | Temple Court, Cathedral Road Cardiff CF11 9HA | 0870 1160110 |
| Aston Barclay UK Ltd | Aston Barclay UK Ltd | 38 Billing Road Northampton NN1 5DQ | 01604 603 066 |
| Astra Connect Services | |||
| Astron Communication & Information Services Ltd | Astron Communication & Information Services Ltd | PO Box 6379 Wimborne BH21 9BN | 0800 376 3113 |
| Astute Communications Ltd | Astute Communications | 323 Wilmslow Road Manchester M14 6NW | 0844 4068 714 |
| As-Voip Communications | As-Voip Communications | 20 Fletcher Gate Nottingham NG1 2FZ | 01159 838795 |
| AT Communications | |||
| Atech Network Services Ltd | Atech Network Services Ltd | Unit 5 Rotherbrook Court Bedford Road Petersfield Hampshire GU32 3QG | 0844 854 0054 |
| Atia Solutions Ltd | Atia Solutions | Tredomen Business and Technology Centre Tredomen Park Ystrad Mynach Hengoed CF82 7FN | 02920 022200 |
| Atlantic Solutions | |||
| Aurora Networks Ltd | Aurora Networks Ltd | 84-85 Long Lane London EC1A 9ET | 0870 410 0910 |
| Aurora UK Ltd | Aurora UK Ltd | Unit 7b Sherwood House Walderslade Centre Chatham Kent ME5 9UD | 01634 672 635 |
| Auto Personnel Ltd T/A Digi-tel Communications | Auto Personnel Ltd T/A Digi-tel Communications | 3 Mews House Princes Lane Muswell Hill London N10 3LU | 020 8444 7333 / 07887 867569 |
| Autovoice Ltd | AUT - Autovoice Ltd | 5 Rectory Lane Breadsall DERBY DE21 5LL | 0845 257 5632 |
| Avandda Ltd | Avandda Ltd | 820 Birchwood Boulevard Birchwood Warrington WA3 7QZ | 01925 250010 |
| Avenue UK Ltd | Southland UK | 60 Charlotte Road London EC2A 3QT | 020 7729 2857 |
| Avoco UK Ltd | Avoco | Unit 38 Derwentside Business Complex Villa Rental Consett, County Durham DH8 6BP | 0845 241 5500 |
| Avonline plc | |||
| Axamba Ltd | Axamba | 36 Davyhulme Road East Stretford Manchester M32 0DW | 0870 777 5215 |
| Axiom Business Systems Ltd | Axiom Business Systems Ltd | Wardens House 4 Broad Street Stamford Lincolshire PE9 1PB | 01780 484 160 |
| Axis Telecom Ltd | |||
| Axonex Ltd | Axonex | Sixth Floor, Eagle Tower Montpellier Drive Cheltenham Gloucestershire GL50 1TA | 01242 535 700 |
| Aztech Global Ltd | Aztech | Cart Lodge Bedlars Green Great Hallingbury Herts CM22 7TL | 0844 251 0506 |
| Azure Telecommunications Ltd | Azure Telecommunications Ltd | No 70, Annexe Four Technology Drive Batley WF17 6ER | 0845 634 1504 |
| Azzurri Communications Ltd | Azzurri Communications Ltd | Azzurri Hous Walsall Business Park Walsall Road, Aldridge West Midlands WS9 0RB | 01922 650111 |
| B C Computing Ltd | BCC Group | The Old Rectory Ferrybridge Road Castleford WF10 4JW | 01977 667777 |
| B.C.M. (Transport) Ltd | RHA Telecom | 28 Bouverie Road West Folkestone Kent CT20 2TG | 0870 870 3232 |
| Bandwidth Networks Ltd | BWN Telecom | Unit 16, Universal Marina Sarisbury Green Southampton S031 7ZN | 08700 33 0645 |
| Banner Business Supplies | talk2office | o2o House Bilton Road Kingsland Business Park Basingstoke, Hampshire RG24 8LJ | 0845 129 7230 |
| Barclay Telecom | Barclay Telecom | 145-149 Donegall Pass Belfast BT7 1DT | 0845 4504650 |
| Barker Telecommunications Ltd | Barker Telecommunications Ltd | Eagle Street Bury New Road Bolton BL2 2BU | 01204 380 002 |
| Barrington Technology Ltd | Barrington Technology Ltd | The Old Barn Cidermill Farm Partridge Lane, Newdigate Surry RH5 5BP | 0870 873 0055 |
| Bay Telecom Ltd | Bay Telecom Ltd | Suite 18 Henley House Queensway Swansea SA5 4DJ | 0844 66 99 111 |
| BCAS (UK) Ltd | Intouch4U | Communications House 143 Maidstone Road Rochester Kent ME1 1RR | 0845 468 6824 |
| BCH Digital Ltd | BCH Digital Ltd | 16a Portland Tower Portland Street Manchester M1 3LD | 0844 556 7722 |
| BDI CCTV Ltd | BDI CCTV Ltd | The Arches Trinity Business Park Fox Way Wakefield, West Yorkshire WF2 8EE | 01924 370900 |
| BDM Voice Ltd | BDM Voice Ltd | The Priory Centre Franklynn Road Haywards Heath West Sussex RH17 5DS | 0845 373 4100 |
| BDR Networks Ltd | |||
| Be Un Ltd | O2 | Wellington Street Slough SL1 1YP | 0777 177 5716 |
| Beagle Communications Ltd | |||
| Beaming Ltd | Beaming Ltd | Innovation Centre Highfield Drive St Leonards On Sea East Sussex TN38 9UH | 0800 027 2656 |
| Beanstalk Telecom Ltd | Beanstalk Telecom Ltd | 100 High Ash Drive Leeds LS17 8RE | 0845 130 5211 |
| Belcom Networks | Belcom Networks | 3 Wellington Park Belfast BT9 6DJ | 0845 270 4411 |
| Bellview Comms Ltd | BellView Comms | 22 Newlands Woods Bardolph Avenue Croydon CR0 9JR | 07734 046654 |
| Benison Communications Ltd | Benison Communications Ltd | The Beeches Station Road Laurencekirk Aberdeenshire AB30 1BE | 01561 377 660 |
| Berry Consultants Ltd | Berry Consultants (systems) Ltd | Units 17 & 18 Bradmarsh Business Park Bow Bridge Close Rotherham S60 1BY | 0845 121 7333 |
| Best 4 Business Communications Ltd | Best 4 Business Communications Ltd | 41 Conway Road Shirley Solihull B90 4RF | 0121 244 0787 |
| Best Communications | Best Communications | 82 Wykeham Street Kirkdale Merseyside L4 1QY | |
| Best Practice IFA Group Ltd | Best Practice | Old Bank Chambers 109-111 High Street Hurstpierpoint West Sussex BN6 9PU | 01273 837600 |
| Best Value Providers Ltd | Best Value Providers | 3 Trinity Street Stratford-upon-Avon Warwickshire CV37 6BL | 0871 4 25 27 29 |
| Better Telecom Ltd | Better Telecom Ltd | Unit 5 & 6 Greenline Business Park Wellington Street Burton-On-Trent Staffordshire DE14 2AS | 0845 652 0248 |
| Better Telecoms | Better Telecoms | 121 London Road Knebworth Herts SG3 6EX | 0870 758 2700 |
| Between the Lines Communication Ltd | Between The Lines Communication | Brackenmount House 58 Napier Road Crowthorne RG45 7EL | 0845 450 2100 |
| Bills R Us Ltd | Bills R Us Ltd | Abbey Mill, Station Road Bishops Waltham Southampton Southampton SO32 1GN | 01489 896021 |
| BillSmart Ltd | Bill Smart Ltd | Paragon House Lord Street South Leigh Lancashire WN7 1YB | 0800 096 0202 |
| BIS Ltd | BIS Ltd | The Baltic Exchange 38 St. Mary Axe London EC3A 8BH | 020 7861 9322 |
| BISCIT | Biscit Telecom | 9 Hale Lane Mill Hill London NW7 3NU | 0870 741 9214 |
| BisNet Ltd | BisNet Ltd | 137 Victoria Road Ferndown, Dorset BH22 9HX | 01202 863 246 |
| Black & White Telecom Ltd | Black & White Telecom | PO Box 13 Portrush County Antrim BR56 8WZ | 0870 872 1080 |
| Blacksheep Internet Marketing Ltd t/a Blacksheep Business Communications | Blacks Sheep Business Communications | 250 Swan Lane Hindley Wigan WN2 4EY | 0800 092 5439 |
| Blackstar Internet Ltd | Blackstar Internet Ltd | Unit 12 Joiners Square Industrial Estate Hampton Street Stoke-On-Trent ST1 3EX | 01782 279 333 |
| Blaze Networks Ltd | Blaze Networks Ltd | Beechfield House Lyme Green Business Park Winterton Way Macclesfield, Cheshire SK11 0LP | 01625 511475 |
| Blizzard Telecom Ltd | Blizzard Telecom ltd | Swan Court Waterhouse Street Hemel Hempstead Hertfordshire HP1 1DS | 0845 8737950 |
| Bloxham Mill Services Ltd | Bm-it | Bloxham Mill Barford Road Bloxham Banbury OX15 4FF | 01295 724545 |
| Blue & Red Ltd | Blue & Red Ltd | PO Box 1003 Peterborough PE1 9GG | 0845 603 0603 |
| Blue Diamond Telecommmunications Ltd | Blue Diamond Telecommunications Ltd | Alexander House 106 Pembroke Road Ruislip Middlesex HA4 8NW | 0870 055 4242 |
| Blue Line Communications | Blue Line Communications | Trewen The Street Motcombe Shaftsbury, Dorset SP7 9PF | 01747-854410 |
| Blue Ridge Telecom Systems LLC | |||
| Blue River Telecom LTD | Blue River Telecom LTD | 167 Dunstable Road Luton LU1 1BW | 0844 545 0808 |
| Blue Saffron Ltd | Blue Saffron Ltd | Shakespeare House 168 Lavender Hill Battersea LONDON SW11 5TF | 0870 891 0202 |
| Blue Sky Mangement Services Ltd | |||
| Blue Spot Technologies Ltd | Blue Spot Technologies Ltd | 100 Mount Pleasant Westerham, Kent TN16 3TR | 0870 950 5550 |
| Blue Square Telecoms Ltd | Eurotelecom | 1a Bow Lane London EC4M 9EE | 020 7618 1980 |
| Blue Telecommunications | |||
| Bluebell Telecom Ltd | Bluebell Telecom Ltd | Murlain House Union Street Chester CH1 1QP | 0870 770 8998 |
| Blueberry Connections Ltd | Blueberry Connections Ltd | 70-74 Brunswick Street Stockton on Tees TS18 1DW | 01642 345252 |
| BlueBill Ltd | BlueBill Ltd | 57 London Road Enfield Middx EN2 6DU | 020 8370 8370 |
| Bluecherry Telecom Ltd | Bluecherry Telecom Ltd | Queensway House 207-209 Queensway Bletchley MK2 2ED | 01908 632 943 |
| Bluevolution Ltd | Virtual Carrier Ltd | 61-71 Cornwall Street Birmingham B3 2EE | 0800 015 2772 |
| Boldfield Ltd | Boldfield Ltd | Cambridge House 91 High Street Longstanton Cambridge CB24 3BS | 01954 789 978 |
| Bon.net Systems Ltd | BON.net Systems Ltd | Bede House George Street Huntingdon Cambridgeshire PE29 3BT | 020 7049 0000 |
| Border Communications | BORDER CALL | LCR Administrator Unit 4, Sweetlake Bus. Village Longden Road Shrewsbury, Shropshire SY3 9EW | 01743 232316 |
| Boundary Networks Ltd | Boundary Networks Ltd | 20 Willowbrook Road Worthing West Sussex BN14 8NA | 01903 232222 |
| Bourke Telecomunicaoese Servicos LDA | TULIP M | Unit 21, Park Royal Metro Centre Britannia Way London NW10 7PA | 020 8965 8964 |
| B-Partners Ltd | Planet-B | 10 Barley Mow Passage Chiswick London W4 4PH | 020 8090 2971 |
| Brandford Consulting Ltd | Brandford Consulting | 41 Hartley Down Purley Croydon Surrey CR8 4EF | 020 8407 9034 |
| Breeze Telecom Ltd | Breeze Telecom Ltd | Moulsham Mill Parkway Chelmsford CM2 7PX | 0845 888 7800 |
| Brent Telecom | Brent Telecom | 1 Coalisland Road Dungannon Co Tyrone BT71 6JT | 02887 729580 |
| Bridgecom Networks Ltd | BRIDGECALL LTD | 2 Alexandra Gate Ffordd Pengam CARDIFF CF24 2SA | 02920 452 525 |
| Bridgwater Communications(South West) Ltd | Bridgwater Communications (South West) Ltd | 57 Eastover Bridgwater Somerset TA6 5AP | 01278 439 300 |
| Brighter Bills Ltd | Brighter Bills Ltd | Tarporley Business Centre Nantwich Road Tarporley Cheshire CW6 9UT | 07973 218341 |
| Brighter Connections | Brighter Connection Ltd | The Continental Suite Hill Top Road Huddersfield HD1 4SD | 01484 467840 |
| Brightview Internet Services | Greenbee Telecom | 9-10 Grafton Street, London W1S 4EN | 020 7665 3000 |
| Brightview Internet Services | Madasafish | 9-10 Grafton Street London W1S 4EN | 020 7665 3000 |
| Britannia Mobile Communications Ltd | Britannia Mobile Comms Ltd | 2 Thomas Holden Street Bolton BL1 2QG | 01204 550626 |
| Britannia Network Services Ltd | Britannia Network Services Ltd | Britannia House 2 Thomas Holden Street Bolton, Lancashire BL1 2QG | 0870 754 5556 |
| Britannia Telecommunications Ltd | Britannia Telecommunications Ltd | 15 Bishops Grange Rugeley Staffordshire WS15 3JY | 0800 012 6336 |
| Britannic Technologies Ltd | |||
| Britclick Telecom | Britclick Telecom | 40 Huddersfield Road Meltham Huddersfield West Yorkshire HD9 4AG | 0845 1 292922 |
| Britclick Telecom | InterVoip Ltd | 40 Huddersfield Road Meltham Huddersfield West Yorkshire HD9 4AG | 0845 1 292922 |
| Britclick Telecom | Telcoswitch Ltd | 40 Huddersfield Road Meltham Huddersfield West Yorkshire HD9 4AG | 0845 1 292922 |
| British Sky Broadcasting | Sky Talk | PO Box 43 Livingston West Lothian EH54 7DD | 0870 905 9051 |
| Broadband Boutique Ltd | Broadband Boutique | Branston Court Branston Street Birmingham B18 6BA | 0333 321 0446 |
| Broadtalk Communications Ltd | Broadtalk Communications Ltd | 3-5 Kewus Road Sidcup Kent DA14 4NB | 020 8309 1400 |
| Bruin Communications Ltd | Bruin Communications Ltd | PO Box 98 Leominster Herefordshire HR6 6AY | 0844 493 0455 |
| BT | BT Global Services | BT Centre 81 Newgate Street London EC1A 7AJ | 020 7356 5000 |
| BT | BT Retail | BT Centre 81 Newgate Street London EC1A 7AJ | 020 7356 5000 |
| BT | BT Wholesale | BT Centre 81 Newgate Street London EC1A 7AJ | 020 7356 5000 |
| BTT Network Solutions LTD | BTT Nework Solutions | Five Willows Farm Old Thrapston Road Cranford Northampton NN14 4AW | 01536 211100 |
| Budd Communications Ltd | Buddconnect.com | Unit 3 Willcock House Southway Drive Warmley Bristol BS30 5LW | 0845 130 2664 |
| Bulldog Communications Ltd | |||
| Business Efficiency Ltd | Business Efficiency | 8 Robin Crescent London E6 5XA | 07933 361504 |
| Business IT Experts Ltd | "USE MY" | First Floor 21 Kings Avenue Prestatyn Denbigshire LL19 9AA | 01745 886 954 |
| Business Network Services | |||
| Business Network Solutions Ltd | Busniess Network Solutions | 167 Stafford Street Walsall West Midlands WS2 8EA | 01922 471 890 |
| Business Phone Calls Ltd | |||
| Business Phones Ltd | Business Phones Ltd | The Stables Wassell Grove Lane Hagley Stourbridge DY9 9JH | 0844 822 1212 |
| Business Serve Plc | |||
| Business Solutions Telecom Ltd | Business Solutions Telecom Ltd | 134 Kennel Lane Gt Burstead Billericay Essex CM11 2SU | 01277 624657 |
| Business Systems (Scotland) | Business Systems (Scotland) | 2 Glenpark Ave Glasgow G46 7JF | 07850 760966 |
| Business Telecom Solutions Ltd | |||
| Business Telenet (UK) Ltd | |||
| Business Telephone Network Services Ltd | Business Telephone Network Services Ltd | 5 Fewster Road Nailsworth Glos GL6 0DH | 01453 833 684 |
| Business Transfer Communications Ltd | |||
| Business VoIP Communications | Business VoIP Communications | 85/12 Hopetoun Street Edinburgh EH7 4NJ | 0845 223 7251 |
| BusinessCall | BusinessCall | Newhaven Pyrford Woods Woking Surrey GU22 8QR | 01932 356 222 |
| BusinessWatch UK Fire & Security Ltd | Businesscoms | Unit 9 Swan Court Forder Way Peterborough PE7 8GX | 0845 290 3733 |
| Businesswatch UK Telecommunications Ltd | Businesswatch UK Telecommunications Ltd | Unit 6 Orton Enterprise Centre Bakewell Road Orton Southgate Peterborough PE2 6XU | 01733 239 997 |
| Buy Trade Phones Ltd | Buy Trade Phones Ltd | 91 Eldon Road Caterham Surrey CR3 5JU | 0845 658 2489 |
| Buzz Networks Ltd | Buzz Networks1 | Endeavout II Becketts Wharf Lower Teddington Road Kingston Upon Thames, London KT1 4ER | 020 8614 0700 |
| Bytebak Ltd | Bytebak Communications | 1b South Mill Warwick Mill Warwick bridge Carlisle CA4 8RR | 01228 562 666 |
| C2-UK Communications Ltd | C2-UK Communications | Ribble Court, 1 Mead Way Shttleworth Mead Ind Estate Padiham Lancashire BB12 7NG | 0845 458 6622 |
| C3 Ltd | C3 Ltd | The Jeffreys Building St. Johns Innovation Centre Cowley Road Cambridge CB4 0WS | 01223 427700 |
| Cable & Wireless Plc | |||
| Cable and Wireless (Energis) | Cable and Wireless (Energis) | Lakeside House Cain Road Waterside Park Bracknell, Berkshire RG12 1XL | 0800 316 1600 |
| Cable Direct Ltd | Cable Direct Ltd | 95 Manchester Road Rochdale, Lancashire OL11 4JG | 0870 906 0066 |
| Cable Direct Ltd | Cable Direct Ltd | Centenary House 95 Manchester Road Rochdale Lancashire OL11 4JG | 0870 906 0066 |
| Cable Telcommunications Ltd | Cable Telecommunications Ltd | 15 The Broadway Woodford Green Essex IG7 6LU | 020 8506 6481 |
| Cable Telecom (GB) Ltd | |||
| Cablestream Ltd | Cablestream Ltd | Glamorgan House Cardiff Gate Business Park Cardiff CF23 8RD | 02920 545 945 |
| Cad-Capture LTD | Airtime | Challenge Way Greenbank Technology Park Blackburn BB1 5RR | 01254 504420 |
| Cadenza Communications Consulting UK Ltd | Cadenza Voice | 27 Old Gloucester St London WC1N 3XX | 07788 975996 |
| CAE Communications Ltd | CAE Communications Ltd | CAE House Colonial House Watford Herts WD24 4PT | 08708 500 510 |
| Calibre Network Ltd | |||
| Call Connect Ltd | Call Connect | PO Box 8026 Reading RG6 9DR | 0800 197 3545 |
| Call Flow Solutions Ltd | Call Flow Solutions Ltd | 1st Floor, Cornwallis House Pudding Lane Maidstone Kent ME14 1NY | 01622 686 449 |
| Call Options Bristol & Bath Ltd | |||
| Call Portal Ltd | Call Portal Ltd | Lion House New Road Rougham Suffolk IP30 9LJ | 08000 776909 |
| Call Sense UK Ltd | Call Sense UK | Unit F19 Scope House Weston RD Crewe CW1 6DD | 08704 42 43 44 |
| Call Stream Ltd | Call Stream | Bordesley Hall The Holloway Alvechurch, Birmingham B48 7QA | 0870 787 7868 |
| Callagenix Ltd | |||
| Callmaster Ltd | Callmaster | Wrecclesham Road Wrecclesham Fernham, Surrey GU10 4PS | 01252 711 053 |
| Callmonitor Ltd | Callmonitor Ltd | 207 Regent Street London W1B 4ND | 0800 074 7456 |
| Calteq Ltd | Calteq Ltd | Weston Business Centre Parsonage Road Takeley Essex CM22 6PU | 0845 2000002 |
| Cambrian Communication Cyf | Cambrian Communications Cyf | 12 Hole in the Wall Street Caemarfon Gwynedd LL55 1RF | 01286 672866 |
| CANetworks Ltd | |||
| Capital Telecom (London) Ltd | Capital Telecom | 81 Chevening Road London SE19 3TD | 0845 688 3997 |
| Capital Telecoms Ltd | Capital Telecoms | 2A Forest Drive Theydon Bois Epping Essex CM16 7EY | 07737 273535 |
| Capito Holdings Ltd | Capito | Caputhall Road Deans Livingston EH54 8AS | 0845 644 3601 - 01506 472 492 |
| Capstan Communications Ltd | Capstan Communications Ltd | Unit B, Blatchford Road Horsham West Sussex RH13 5QH | 01403 221728 |
| Captive8 Ltd | |||
| Care Telecom Ltd | Care Telecom | 53 Whitefriars Wharf Tonbridge Kent TN9 1QR | 01732 358 864 |
| Carter Allen | Carter Allen | 4b The Listed Building 350 the Highway LONDON E1W 4HU | 0870 053 7000 |
| Catalyst Communications Networks Ltd | Catalyst Communications Networks Ltd | 5 Cartwright House County Street London SE1 6AN | 020 7787 4100 |
| Caudwell Communications Ltd | Caudwell Communications | Christie Fields Derwent Avenue Manchester M21 7QS | 0161 451 1000 |
| Caudwell Communications Ltd | Caudwell Communications/Homecall | Christie Fields Derwent Avenue Manchester M21 7QS | 0161 451 1000 |
| Caudwell Communications Ltd | Homecall | Christie Fields Derwent Avenue Manchester M21 7QS | 0161 451 1000 |
| Cause Call | |||
| Cavendish Maintenance Ltd | |||
| CECOM | CECOM | 11 Pyle Road Bishopton Swansea SA3 3HH | 0800 019 8333 |
| Cedar Telecom Ltd | Cedar Telecom | Innovation House Mill Street Oxford OX2 0JX | 01865 458 609 |
| Celcom Ltd | Celcom Ltd | 277-279 Wood Street London E17 3ND | 0845 021 2323 |
| CellCall Ltd | |||
| Cellsite Communications Ltd | Cellsite Communications Ltd | 7 Station Road Yate Bristol BS37 5HT | 01454 881 821 |
| Celltek Communications UK Ltd | Celltek | Globe House Moss Bridge Road Rochdale O46 5EB | 0870 905 0789 |
| Cellular Communications Ltd | |||
| Cellular Solutions & Services Ltd | Cellular Solutions & Services Ltd | Solutions House Knoll Business Park Old Shoreham Road Hove BN3 7GS | 01273 424220 |
| Cencion Communications Ltd | Cencion Communications Ltd | 6 Brewery Yard Deva Centre Trinty Way Manchester M3 7BB | 0870 7515555 |
| Central Technology Ltd | Central Technology | Central Technology Ltd Beresford Way Chesterfield S41 9FG | 08456 43 43 46 |
| Centrica Telecommunications | |||
| Centrin Ltd | Centrin | 76 Guinea Hall Lane Banks Southport PR8 8BT | 08442 451 555 |
| Centrix Ltd | Centrix Ltd | Winchfield Lodge Old Potbridge Road Winchfield, Hampshire RG27 8BT | 0870 143 4343 |
| Chalvington Communications Ltd | |||
| Chamber Communications Ltd | Chamber Communications Ltd | 40 Princess Street Manchester M1 6DE | 0845 6666551 |
| Change Implementations Ltd | Change Implementations Ltd | 5 Amhurst Road Telscombe Cliffs Brighton BN10 7AG | 0845 4506388 |
| Channel Force Ltd | Uscom Ltd | USC House Choseley Road Docking, Norfolk PE31 8LZ | 0870 750 8300 |
| Channel Media Communications | Channel Media Communications | 40 Hollerith Rise Bracknell Berkshire RG12 7GJ | 01344 670015 |
| Channel Networks Services Ltd | Channel Networks | Channel House 127 Duckmoor House BRISTOL BS3 2BJ | 0117 900 5000 |
| Channel Telecom Ltd | Channel Telecom Ltd | 9 Arlingham Mews Waltham Abbey Essex EN9 1ED | 0845 330 0017 |
| Charles Street Communications Ltd | Charles Street Communications Ltd | 6 Duke Street St Jame's London SW1Y 6BN | 020 7451 1313 |
| Charlton Networks Ltd | Charlton Telecom | The Canterbury Business Centre 18 Ashchurch Road Tewkesbury Gloucestershire GL20 8BT | 001684 856830 |
| Charterhouse Voice & Data PLC | Charterhouse Voice & Data PLC | Gate House 5 Chapel Place Rivington Street London EC2A 3DQ | 020 7613 7395 |
| Chase Telecom Ltd | Chase Telecom | 2/7 Canon Lane Edinburgh EH3 5HD | 0131 557 2771 |
| Check Communications Ltd | |||
| Cherry Telecom Ltd | Cherry Telecom Ltd | Suite 3 Pegasus House, Tilson Road Roundthorne Ind Est Manchester M23 9GF | 0161 945 6838 |
| Cherry Telecom Ltd | Least Cost Telecom Ltd | Manor Farm 12 Alder Drive, Timperley Altrincham Cheshire WA15 7YG | 0870 751 3292 |
| Cheshire Cricket Telecom Ltd | Cricket Telecom | The Pavilion 26 Oakwood Way Hamble Hampshire SO31 4HH | 0845 450 3413 |
| Cheshire Telecom Ltd | Cheshire Telecom Ltd | Fernessia House 29 Avon Road Hale Altrincham, Cheshire WA15 0LB | 0870 034 5050 |
| Chess plc | |||
| Chester Communications | Chester Communications | 225 Hoole Lane Chester Cheshire CH2 3EP | 01244 348667 |
| Chilli Telecom Ltd | Chilli Telecom Ltd | New Chartered House Centuriion Way Cleckheaton West Yorkshire BD19 3QB England | 0844 8710181 |
| Chime Telecom Ltd | |||
| Choice Numbers Ltd | Choice Non Geo & Choice Switch | Oakfield Wrotham Hill Road Wrotham Sevenoaks, Kent TN15 7PT | 020 7047 4446 |
| Choose Pure Solutions Ltd | Choose Pure Solutions Ltd | Imex Business Centre Brookfiled Road Arnold Nottingham NG5 7ER | 08700 116 383 |
| ChunkyChips.net Ltd | ChunkyChips.net Comms | ChunkyChips.net Ltd Units 1-2 Cornell Estate Navigation Road Chelmsford,Essex CM2 6HE | 0870 255 8000 |
| Churchill Office Solutions Ltd | Churchill Office Solutions Ltd | 381/385 Tyburn Road Erdington Birmingham B24 8HJ | 0121 6938208 |
| CI-Net Ltd | CI-Net | Network House Langford Locks Kidlington Oxford OX5 1GA | 01865 856 020 |
| Citicom Network Services (UK) Ltd | |||
| Citiwide Facilities Management Ltd | Citiwide | 6 & 7 Harbour Exchange Square London E14 9GE | 0207 419 5992 |
| Citrus Networks UK Ltd | Citrus Networks VoIP Services | Orchard House 85 Mosslea Road Whyteleafe Surrey CR3 0DS | 020 7100 2410 |
| Citrus Telecommunications Ltd | |||
| City Numbers Ltd | City Numbers Ltd | Office 22 27 Colmore Row Birmingham B3 2EW | 0845 366655 |
| City Telecom | City Telecom | CET House 36 Golders Gardens London NW11 9BU | 0808 129 6000 |
| Claranet | Claranet | 21 Southampton Row London WC1B 5HA | 020 7685 8310 |
| Clarion Communication Management Ltd | Clarion Communication Management Ltd | Unit 5 107 Freston Road London W11 4BD | 08456 444 585 |
| Claritas Solutions Ltd | Claritas Telecommunications Ltd | Bowcliffe Hall Bramham Wetherby LS23 6LP | 01937 849966 |
| Clarity Telecom | Clarity Telecom | First Floor 103-113 Ravenhill Road Belfast BT6 8DR | 0800 912 0999 |
| Clarus Business Solutions Ltd | Clarus Communications | Lakesview International Business Park Canterbury Kent CT3 4NH | 0844 858 9235 |
| Class Affinity Projects Ltd | Class Telecommunications | The White House Church Road Leatherhead, Surrey KT22 8BB | 0870 770 0321 |
| Clear Comms Ltd | Clear Comms Ltd | 26 York Street Westminster London W1U 6PZ | 0845 402 3002 |
| Clear Connect Ltd | Clear Connect | Connect House P.O. Box 143 Swansea SA2 0WT | 0870 990 9939 |
| Clear Digital Serives Ltd | Clear Digital Services Ltd | 4th Floor 72 Church Street Liverpool L1 3AY | 0151 7072125 |
| Clear Talk Telecom | Clear Talk Telecom Ltd | 60 Sherborne Street Manchester M8 8LR | 0844 225 1225 |
| Clear Telecom and Data Ltd | Clear Telecom and Data Ltd | 291 London Road Hadleigh Essex SS7 2BN | 01702 539896 |
| Clearcall 2000 Ltd | Clearcall 2000 | Unit 40 The Enterprise Centre Cranbourne Road Potters Bar, Hertfordshire EN6 3DQ | 0800 027 7066 |
| Clearly Connected Ltd | Clearly Connected Ltd | 15 Bishops Grange Rugeley Staffs WS15 3JY | 01889 574476 |
| ClearPath IP Ltd | ClearPath IP Ltd | Innovate Office Lake View Drive Sherwood Park Nottingham NG15 0DA | 01623 687777 |
| Clearstream technology Ltd | Clearstream Technololgy Ltd | Tredomen Innovation & Technology Centre Tredomen Business Park Ystrad Mynach Hengoed CF82 7FN | 0845 867 4075 |
| Clearvoice Communications Ltd | |||
| Clever IP Ltd | Clever IP | Bay Tree Cottage The Village Burton Neston CH64 5TH | 0845 270 2980 |
| Clickphone Ltd | Clickphone Ltd | Unit 9 17 Piries Place Horsham West Sussex RH12 1BF | 01403 339 809 |
| Club Call Management Ltd | Club Call Management Ltd | 69 North Lane Astley Tyldesley Manchester M29 7AB | 0845 056 5666 |
| Club Communications Ltd | |||
| Club Talk Ltd | Club Talk Ltd | Ailesbury Close Chippenham Wiltshire SN15 3TX | 08712 310 410 |
| Club-Tel Ltd | Club Tel | Club House 2 Brookfield Avenue Blackrock, Dublin | 00 (353) 1278 9 |
| CMR Consultants Ltd | |||
| C-Net Ltd | C-Net Ltd | 17 Oyster Place Montrose Road Chelmsford Essex CM2 6TX | 01245 451 651 |
| CNS Ltd | Connectacom Network Solutions Ltd | Bradley House St Albans Lane Golders Green, London NW11 7QE | 020 8455 6044 |
| CNW Communications Ltd | |||
| Coach House Communications Ltd | Coach House Communications Ltd | The Coach House Sherridge Leigh Sinton Malvern Worcs WR13 5DB | 0870 4440888 |
| Cobus Ltd | Cobus Communications | Empire House 22 Strickland Street Hull East Yorkshire HU3 4AQ | 01482 421070 |
| Cogent Business Ltd | Cogent Enterprise | 143e Arthur Road Windsor SL4 1SE | 01753 855 972 |
| Cole Robert & Co Ltd | CRC Telecom | 35 Marsh Parade Newcastle ST5 1BT | 0870 787 0387 |
| Colloquium Ltd | Colloquium | 101 Abercorn Street Paisley PA3 4AT | 08454 330 000 |
| COLT Telecommunications | |||
| Columbus Telecom Ltd | Columbus Telecom | Milngavie Enterprise Centre Ellangowan Court Glasgow G62 8PH | 0870 060 3602 |
| Columbus Telecom Solutions Ltd | Columbus Telecom Solutions | 1 Colquhoun Drive Bearsden, Glasgow G61 4NQ | 0141 943 1943 |
| Comcen Computer Supplies Ltd | Comcen Technology | Bruce Road Swansea West Ind Park Swansea SA5 4HS | 01792 515 566 |
| Commando Telecom Ltd | Commando Telecom | 724 Fulham road Fulham London SW6 5SF | 07952 717215 |
| Commexchange Ltd T/A Morden Networks | Modern Networks | Unit 2 Knowl Piece Wilbury Way Hitchin SG4 0TY | 01462 426 500 |
| Comms Direct Telecom Ltd | Comms Direct Telecom Ltd | Dominions House Dominions Arcade Queen Street Cardiff CF10 2AR | 0844 6331818 |
| Comms Factory Ltd | Comms Factory Ltd | Premium House The Esplanade Worthing West Sussex BN11 2BJ | 0870 990 5998 |
| Comms Factory Ltd | Lo-call Telecom Ltd | Premium House The Esplanade Worthing BN11 2BJ | 0845 450 0070 |
| Comms Factory Ltd | My Team | Premium House The Esplanade Worthing West Sussex BN11 2BJ | 0845-2410908 |
| Comms Factory Ltd | Your Team | Premium House The Esplanade Worthing West Sussex BN11 2BJ | 0845-2410908 |
| Comms Factory Ltd | YourCalls.Net | Premium House The Esplanade Worthing West Sussex BN11 2BJ | 08454 505 020 |
| Comms Management Ltd | Comms Management Ltd | Connaught House Riverside Business Park Benarth Road, Conwy North Wales LL32 8UB | 0845 450 3040 |
| Comms Solutions Ltd | CommsSolutions | 1 Sherman Road Bromley Kent BR1 3JH | 020 8313 6684 / 6680 |
| Comms Solve | Comms Solve | 1a Church Lane Sarratt Hertfordshire WD3 6HN | 0845 345 1454 |
| Comms Solve Support LTD | Comms Solve Support | 15 Bishops Grange Rugeley Staffs WS15 3JY | 01889 574476 |
| Comms Solve Technologies Ltd | Comms Solve Technologies Ltd | The Barn Maylons Bury Weir Lane Buckland SG9 0PU | 01763 275 801 |
| Comms Uk Ltd | Comms Uk | Comms House Collingwood Road West Morrs, Wimborne Dorset BH21 6QW | 01202 894222 |
| CommsFM Ltd | CommsFM Ltd | Caledonia House Lawmoor Street Glasgow G5 0US | 0800 975 0700 |
| Commsplus Ltd | Commsair | 51 Gazelle Road Weston-Super-Mare, North Somerset BS24 9ES | 01934 882 200 |
| CommsResources | CommsSolutions | Number One Sherman Roiad Bromley Kent BR1 3JH | 0208 313 6680 |
| Commsworld Ltd | Commsworld | Commsworld House Peffer Industrial Estate Peffer Place Edinburgh EH16 4BB | 0141 353 4211 |
| Commsworld Ltd | Commsworld | 100 Borron Street Port Dundas Business Park Glasgow G4 9XG | 0845 330 5033 |
| Comm-Tech Martam Ltd | Comm-Tech Data Solutions | Communications Centre Rollesby Road Martham Great Yarmouth, Norfolk NR29 4RU | 01493 748274 |
| CommuniCall (UK) Ltd | CommuniCall (UK) Ltd | Richmond House 570-572 Eturia Road Newcastle-under-Lyme Staffordshire ST5 0SU | 07779 219078 |
| Communicate Better Business Solutions | Communicate Better Business Solutions | 222 Manchester Road Worsely Walkden Manchester M28 3LU | 0845 273 6666 |
| Communicate Business Solutions Ltd | Triangle Telecom | 6 Hill Road Clevedon North Somerset BS21 7NE | 01275 871122 |
| Communicate Information Ltd | |||
| Communication Networks Ltd | |||
| Communication Solutions Ltd | Communications Solutions Ltd | 1 Rhiw Road Colwyn Bay Conwy North Wales LL29 7TE | 0845 2700 672/3 |
| Communications Consultants Ltd | |||
| Communications EBS Ltd | Intelicoms | KBC House 42-50 Hersham Road Walton on Thames KT12 1RZ | 0870 2 40 30 20 |
| Communications Interactive Management Ltd | Communications Interactive Management Ltd | 12 Shenval House Harlow Essex CM20 2BD | 0845 127 9818 |
| Communications One Ltd | Communications One Ltd | 15 Bishops Grange Rugeley Staffs WS15 3JY | 01889 574476 |
| Communications South Ltd | Communications South Network Services | 284 Hayling Avenue Portsmouth Hampshire PO3 6EF | 02392 833 993 |
| Communication-Stem | Communication-Stem | 15-16 Lower Park Row Bristol BS1 5BN | 0845 2410000 |
| Communication-Tech UK Ltd | Commtech | Commerce House Bridgeman House Bolton Lancs BL2 1DW | 08707 106 688 |
| Communication-Tech UK Ltd | Communication-Tech UK Ltd | Commerce House Bridgeman House Bolton Lancs BL2 1DW | 08707 106 688 |
| Communicoms Ltd | Communicoms Ltd | Suite 1, Swan Park Business Centre Kettebrook Road Tamworth Staffordshire B77 1AG | 0845 017 8811 |
| Communio Networks Ltd | Communio Networks | 1 Frogmore Road Hemel Hempstead Herts HP3 9TG | 0870 190 0870 |
| Company Communication UK Ltd | Company Communication UK LTD | 58 Buckinham Road Weston Industrial Estate West Super Mare North Somerset BS24 9BG | 0845 4021277 |
| Company Communications Ltd | Company Communications Ltd | Europa House Coppicemere Drive Crewe Business Park Crewe CW1 6GZ | 01270 503010 |
| Complete Business Solutions (NW) Ltd | Complete Business Solutions | 40 Devonshire Road Bolton BL1 4PQ | 01204-848414 |
| Complete Networks Ltd | Complete Networks Ltd | The New Media Center 36-42 New Tythe Street Long Eaton Nottingham NG10 2DB | 0845 070 4440 |
| Complete Systems | Complete Systems | Manor House Avenue Millbrook Southampton SO15 0LF | Unit 9 |
| Computacall | Computacall | Station House Midland Road Luton LU2 0HS | 01582 488885 |
| Computer Communications & Network Solutions Ltd | CCNS | Letchford House Headstone Lane Harrow Middx HA3 6PE | 0870 436 1821 |
| Computer Systems UK Ltd | Rapid ADSL | 15 Southmill Trading Centre Southmill Road Bishops Stortford Herts CM23 3DY | 0870 3866 222 |
| Computerease Ltd | Computerease Ltd | 4 Bramble Street Derby DE1 1HU | 0870 444 5414 |
| Computerised Business Systems Ltd | Computerised Business Systems Ltd | 554-556 Barton Road Stretford Manchester M32 9TD | 0161 755 9441 |
| Coms.Com Ltd | Coms.Net | 77 Queen Victoria Street London EC4V 4AY | 020 7148 3000 |
| Comtact Ltd | Comtact Ltd | 46-48 East Smithfield London E1W 1AW | 08452 757575 |
| Comtec Business Equipment Ltd | |||
| Comtec Telecom and Data Ltd | |||
| Comtxt Ltd | Comtxt | Cavell House Stannard Place St Crispins Road Norwich NR3 1YE | 01603 821 013 |
| Comvista Ltd | Worldtalk | Suite Six Buko Tower Dalton Road Glenrothes Fife KY6 2SS | 0845 130 2585 |
| Comxo TRIDrading Ltd | Comxo Trading Ltd | Pippin Grove 628 London Road Colnbrook Berkshire SL3 8QH | 01753 710 430 |
| Comxo TRIDrading Ltd | Perpetual Telecom Ltd | 3 Park Street Windsor Berkshire SL4 1LU | 01753 740 472 |
| Comxo TRIDrading Ltd | Swan Telecom | Pippin Grove 628London Road Colnbrook Berkshire SL3 8QH | 01753 710 430 |
| Concept 2000 Ltd | Concept 2000 Ltd | 72 New Bond Street Mayfair London W1S 1RR | 0870 199 3164 |
| Concept Coders Ltd | CC Telecoms | 105B The Big Peg 120 Vyse Street Hockley Birmingham B18 6NF | 0870 902 5580 |
| Concert Networks Ltd | |||
| Concise IT Ltd | Concise IT Ltd | No2 Royal Court Gadbrook Park Northwich Cheshire CW9 7UT | 01606 336200 |
| Concise Telecoms Ltd | Concise Telecoms Ltd | Cygnet Court Hawthorn Street Wilmslow Cheshire SK3 8UB | 01625 416218 |
| Conduit Networks Ltd | Conduit Networks Ltd | 4th Floor 22 Buckingham Gate London SW1E 6LB | 020 7100 5522 |
| Connaught Communication Systems Ltd | Connaught Communication Systems Ltd | 14 Systems House Reddicap Trading Estate Sutton Coldfield, Birmingham B75 7BU | 0121 311 1010 |
| Connaught Telecommunications Ltd | |||
| Connect B2B Ltd | Connect B2B Ltd | Northfield House Northfield End Henley-on-Thames Oxfordshire RG9 2JG | 0800 881 8881 |
| Connect Business Systems Ltd | Connect Business Systems Ltd | Connnect House Waterside Stoke Prior Bromsgrove B60 4FD | 08704 282828 |
| Connect Communications Group Ltd | CC Networks Ltd | Hertford House 1 Cranwood Street London EC1V 9QP | 020 7950 3200 |
| Connect Marketing (UK) Ltd | Connect Marketing (UK) Ltd | 1 Straiton View Straiton Business Parc Edinburgh EH20 9QZ | 0131 440 7777 |
| Connect The World Ltd | Connect The World Ltd | Suite 12 Towerside 148 Wapping High Street Wapping London E1W 3PF | 0870 174 8575 |
| Connected World Communications Ltd | Connected World Communications | 6 Webster Court Warrington WA5 8WD | 01925 467 500 |
| Connexions 4 London | Orbis Telecom | 22 St Peters Road Bournemouth Dorset BH1 2LE | 01202 299799 |
| Connexus Networks Ltd | Connexus Networks | Suite 2 Sperry House Bonds Mill Stonehouse Gloucestershire GL10 3RF | 0870 607 2121 |
| Consega Ltd | Consega Telecom | 7 Beechwood Road West Moors Dorset BH22 0BN | 01202 873783 |
| Consolidated Telecommunications Ltd | Consolidated Telecommunications Ltd | The Octagon Middleborough Colchester CO1 1TG | 0844 892 1498 |
| Consorte UK Ltd | Consorte UK Ltd | Pallinghurst Guildford Road Rudgwick West Sussex RH12 3BQ | 01403 824018 |
| Consortium (UK) Ltd | Consortium (UK) Ltd | Parkway Offices Moss Road Grimsby, North East Lincolnshire DN32 0LW | 0870 190 8900 |
| Consulting Networks Ltd | Consulting Networks Ltd | Customer Services Team 40 March Road Wimblington Cambridgeshire PE15 0RN | 0870 036 1234 |
| Consumer First Telecom Ltd | CF1 Telecom | PO Box 13 Portrush County Antrim BR56 8WZ | 0870 870 1125 |
| Contact Centre Communications Ltd | Contact Centre Communications Ltd | Bolney Place Cowfold Road Bolney, West Sussex RH17 5QT | 01444 880 301 |
| Contact Scotland Ltd | |||
| Continental Telecom Ltd | |||
| Continential Telecom | Continental Telecom | 2 The Close Richmond Surrey TW9 4QW | 0208 891 4791 |
| Continuity Telecom Ltd | Continuity Telecom Ltd | Coltwood House 2 Tongham Road Runfold, Farnham Surrey GU10 1PH | 020 8522 6000 |
| Converged Communication Solutions Ltd | Converged Communication Solutions Ltd | 35 Huntly Street Aberdeen AB10 1TJ | 0800 8620 999 |
| Converged Technologies Ltd | Converged Technologies Ltd | 12 High Street Oliham Hampshire RG29 1LG | 01256 393010 |
| Converged Voice Solutions | Converged Voice Solutions Ltd | 20 Eden Way Winnersh Wokingham Berkshire RG41 5PQ | 0870 4050115 |
| Converge-IT.net Ltd | Converge-IT | Barnett House 53 Fountain Street Manchester M2 2AN | 0870 770 0790 |
| Convergence (Group Solutions) Ltd | Convergence Group | 2 Lammas Centre Budbrooke Road Budbrooke Industrial Estate Warwick CV34 5WQ | 0845 270 2709 |
| Convergence Communications Ltd | Convergence Communications Ltd | 21 & 22 Hall Barn Road Isleham Cambridgeshire CB7 5RD | 08700 332400 |
| Convergent Networks Ltd | |||
| ConvergeOne Ltd | ConvergeOne Ltd | Office 9/10 Moorefield House 2a Moorside Road Swinton Manchester M27 0EW | 0161 793 9744 |
| Converse Telecom Ltd | Converse Telecom | Old Bank House 57 Church Street Staines Middx TW18 4XS | 0845 8739900 |
| Coralbridge Ltd | Coralbridge Ltd | 255/1 Silk House Park Green Macclesfield Cheshire SK11 7QJ | 01625 466 164 |
| Core Telecom Ltd | Outreach Services | Titan House Station Road Horsforth Leeds SL18 5PA | 0844 504 0000 |
| Corinthian Technical Solutions Co Ltd | Corinthian Technical Solutions Co Ltd | Southern Counties House 27-43 Ifield Road Crawley West Sussex RH11 7AT | 01293 434224 |
| Corporate Business Telecoms | Corporate Business Telecoms | 31 Kings Exchange Tileyard Road London N7 9AH | 020 7503 3000 |
| Corporate Communications Europe Ltd | |||
| Corporate Management Telecom Ltd | Corporate Management Telecom (CMT) | 4 Oak Park Hunsdon Nr Ware Herts SG12 8QA | 08707 526 050 |
| Correct Group Ltd | Phone Correct | 10-14 Interlink House 73A Maygrove Road West Hampstead London NW6 2EG | 020 7372 4106 |
| Cortex Communications | Cortex Communications | Whitehall Emine Way Arrington Cambridgeshire SG8 0AG | 0844 858 9223 |
| Countrywide Farmers Energy | Countrywide Farmers Energy | Utilities Dept Defford Earls Croome Worcs WR8 9DF | 01386 757 333 |
| County Autocall Ltd | Autocall | 144 Church Road Hove East Sussex BN3 2DL | 01273 740003 |
| CPS Telecom Ltd | CPS Telecom Ltd | 1st Floor 449-451 High Road Willesden, London NW10 2JJ | 0870 801 6060 |
| CPW Ltd | CPW | Technology House 9 Newton Place Charing Cross Glasgow G3 7PR | 08701 996 108 |
| Cranleigh Communications Ltd | ABS Technology Plc | Technology House Church Road Haslemere, Surrey GU27 1NU | 01428 664 900 |
| Creative Telecoms Ltd | Creative Telecoms Ltd | Studio 229 Great Gulidford Business Square 30 Great Guildford Street London SE1 0HS | 0871 222 7150 |
| Crimzon Communications Ltd | Crimzon Communications Ltd | Devonshire House Devonshire Lane Loughborough Leicestershire LE11 3DW | 01509 238233 |
| Crosscom Ltd | Crosscom Ltd | 3 Brook House Old Wool Lane Cheadle SK8 2PE | 0161 491 5571 |
| Crosscom Ltd | Crosscom Network Services | 3 Brook House Old Wool Lane Cheadle SK8 2PE | 0161 491 5571 |
| Crosscom Ltd | Digital Solutions UK | 3 Brook House Old Wool Lane Cheadle SK8 2PE | 0161 491 5571 |
| Crowthorne Associates Ltd | Crowthorne Associates Ltd | 8 Tavern Quay Rope Street London SE16 7TX | 0870 300 7000 |
| Crystaline Communications Ltd | Crystaline Communications | Boston House Business Centre 69-75 Boston Manor Road Brentford Middlesex TW8 9JJ | 0870 0666 016 |
| CSD Ltd | CSD Telecom | 10 New Road Rayne Braintree Essex CM77 6TG | 01376 333820 |
| CT Networks Ltd | CT Networks Ltd | 3 The Maltings Wetmore Road Burton-on-Trent Staffordshire DE14 1SF | 01283 560 500 |
| CTI Telecom Ltd | CTI Telecom | 8 North Hills Brill Bucks HP18 9TH | 01844 239 750 |
| Custard IT Ltd | Custard IT Ltd | 3 Innovate Mews Lake View Drive Sherwood Park Nottingham NG15 0DA | 0870 401 9966 |
| CWL Associates | CWL Associates | 51 Granby Avenue Harpenden Herts AL5 5QP | 07977 236 785 |
| CWNETWORKS Ltd | |||
| Cygnet Telecom Ltd | Cygnet Telecom Ltd | Warwick House 41 Spring Road Hall Green Birmingham B11 3EA | 0870 787 4710 |
| dabs.com plc | |||
| Daisy Communications Ltd | Daisy Communications | Daisy House Suite 1 Lindred Road Business Park Nelson, Lancashire BB9 5SR | 0845 450 4520 |
| Dalecom | Dalecom | Unit 1C Toll Bar Workshops Station Road Sedbergh, Cumbria LA10 5HA | 01539 622 300 |
| Daly Systems Ltd | Daly Systems Ltd | 9-10 St Matthews Business Centre Gower Street Leicester LE1 3LJ | 0116 242 6990 |
| DAM Telecommunications Ltd | DAMtel | DAMtel Telecommunications Ltd DAMtel House 18 Soho Square London W1D 3QL | 0871 995 5222 |
| Damovo UK Ltd | Damovo UK | Broadlands Business Park Langhurstwood Road Horsham West Sussex RH12 4QP | 01403 244000 |
| Database for Business Ltd | DBFB Communications | Cato House 5 Talavera Court Darnell Way, Moulton Park Northampton NN3 6RW | 0870 442 4924 |
| Dataflow Communications Ltd | |||
| Datasharp Technology Systems Ltd | Datasharp Technology | 11 Anderson Crescent Elgin IV30 4HJ | 01343 810831 |
| Datasharp UK Ltd | Datasharp Network Services | Woodland Court Truro Business Park Truro, Cornwall TR4 9NH | 01872 266 666 |
| Datatech UK LTD | Datatech UK Ltd | Brodesley Hall Alvechurch Birmingham B48 7QA | 0845 0515151 |
| Datatel Networks Ltd | Datatel | 19 Peel Road Douglas Isle of Man IM1 4LS | 0870 333 4947 |
| Datavoice Ltd T/A PositiveIT | Datavoice Ltd T/A PositiveIT | Bynea House Bynea Business Park Llanelli SA14 9SU | 0870 870 5097 |
| Datavox | Datavox Solutions | Saddleworth Business Centre Huddersfield Road Delph OL3 5DF | 0800 0831173 |
| Davria Communications Ltd | Davria Communications | 60 Bartley Road Bensfleet, Essex SS7 4EL | 01268 799 312 |
| DCFM Telecom Ltd | DCFM | DCFM Telecom Ltd 1 Bridge Street Boston PE21 8QF | 01205 310644 |
| DCS Ltd | DCS Ltd | C/o 69 Lane Field Road Bideford Devon EX39 3RD | 07950 371041 |
| DCS Voice & Vision Ltd | Radarpoint Ltd | Unit 7 Titan Court Laporte Way Luton Bedfordshire LU4 8EF | 0870 871 7373 |
| DCT Solutions | DCT Solutions | 167 High Street Strood ME2 4TH | 01634 226 580 |
| Deans Computer Services PLC | Deans Computer Services Plc | Boston Lodge High Street Boston Spa Wetherby LS23 6EA | 01937 541411 |
| Decorum Connect | |||
| Deep Blue Networks | Deep Blue Telecom | Unit 3B Rudgate Court Walton Wetherby LS23 7BF | 0870 224 6200 |
| Definite Networks Ltd | Definite Networks Voice | Definite Networks Ltd The Nova Building, Herschel Street Slough Buckinghamshire SL1 1XS | 01753 701 807 |
| Delta - T Ltd | Delta - T Ltd | 3 Cook Close Brompton on Swale Richmond North Yorkshire DL10 7TY | 0800 0972324 |
| Delta Partners Ltd | Delta Partners | 29 Harley Street London W1G 9QR | 0844 493 0000 |
| Denovo Communication Ltd | Denovo Communications | 33 Estelle Road LONDON NW3 2JX | 0207 424 9095 |
| Denovo Communication Ltd | Intelecom | 33 Estelle Road LONDON NW3 2JX | 0207 424 9095 |
| Denwa Ltd | Denwa Ltd | Lancashire Digital Technology Centre Bancroft Road Burnley Lancashire BB10 2TP | 01282 471857/0845 0761001 |
| Design Communications (UK) Ltd | Design Communications | Orchard Barn Apple Mount Farm Thorpe Morieux Burt St Edmunds IP30 0NQ | 0844 811 79 79 |
| Design Communications Systems Ltd | |||
| Design IT Solutions Ltd | TSFUSION | Unit C, Little Bramshot Farm Cove Road Fleet GU51 2RT | 01252 360480 |
| Design Telecommunications UK Ltd | Design Telecommunications UK Ltd | 136 Central Road Worcester Park Surrey KT4 8HT | 0800 008 7351 / 020 8329 9610 |
| DETEWE Ltd | |||
| Devil7 Ltd | Devil7 | 90-92 Pentonville Road London N1 9HS | 0870 777 5767 |
| Diacom UK Ltd | Diacom Uk Ltd | Unit A The Scotlands London Road Coalville Leicester, Leicestershire LE67 3JJ | 01530 274050 |
| Dial Associates Ltd | Dial Associates Ltd | Millbrook High Bickington Umberliegh Devon EX37 9BX | 0845 458 6994 |
| Dial Business Systems Ltd | Icat Solutions | 17c St Helens Gardens London W10 6LW | 020 3084 3214 |
| Dialect Telecom Ltd | Dialect Telecom Ltd | Tithe Barn Blisworth Hill Farm Stoke Road Blisworth, Northants NN7 3DB | 01604 768770 |
| Difference Corporation Ltd | Difference communications | Merlin House Langstone Business Park Newport NP18 2HT | 0844 4931100 |
| Digicomm BCS Ltd | Digicomm BCS Ltd | 468 Halliwell Rd Bolton Lancashire BL1 8AN | 0870 444 6540 |
| Digiquip Group Ltd | Digiquip Group Ltd | Unit 10 Northbrook Business Park Northbrook Road Worthing West Sussex BN14 8PQ | 0808 178 2769 |
| Digital ip | |||
| Digital Telecom Airtime | Digital Telecom Airtime | Unit 28, Salford University Business Park leslie House Way Salford M6 6AJ | 0845 873 8994 |
| Digital WWW Ltd | SIP Service | 29 Kestrel Avenue London SE24 0ED | 020 7147 7001 |
| Digitel Direct Ltd | Digitel Direct Ltd | Holmfeild Mills Holdsworth Road Halifax HX3 6SN | 08456 522 533 |
| Digitel Europe Ltd | Inet | Communications Centre 1 Ivy Street Priory Industrial Estate, Birkenhead Merseyside CH41 5EE | 0151 6500065 |
| Digitel Technology Ltd | Call-4-Less | 7 Cross Street Barnstaple, Devon EX31 1BA | 0870 750 0551 |
| Direct Communications International | DCI Telecom | Europa House Church Street Old Isleworth, Middlesex TW7 6DA | 0870 770 9901 |
| Direct Marketing Solutions Ltd | |||
| Direct Response Ltd | Direct Response Ltd | 9 Winchester House Kennington Business Park Cranmer Road London SW9 6EJ | 0870 414 9000 |
| Direct Telecom Ltd | Direct Telecom Ltd | 2D Belle Walk Moseley Birmingham West Midlands B13 9DF | 0121 552 6624 |
| Direct Telecommunications (London) Ltd | Direct Telecommunication (London) Ltd | 5 Drakes Courtyard 291 Kilburn High Road London NW6 7JR | 020 7328 0040 |
| Direct Telecommunications Systems Ltd | Direct Telecom | 16 Commercial Road Skelmanthorpe Huddersfield HD8 9DA | 01484 867 867 |
| Direct Telephone Services Ltd | |||
| Directory Business Services | Directory Business Services | Health Farm Wellingore Lincoln LN5 0DW | 01522 811 688 |
| Diva Telecom Ltd | Diva Telecom Ltd | 4100 Park Approach Thorpe Park Leeds LS15 8GB | 0844 873 23 53 |
| DM Business Solutions | Telstream | Patrick House 5 Maney Corner Sutton Coldfield West Midlands B72 1QL | 08707 525 354 |
| Docklands Telecom Centre Ltd | Docklands Telecom Centre Ltd | 9 Ashton Gate Ashton Road Romford Essex RM3 8UF | 01708 383 222 |
| Dolphin Com Ltd | Dolphin Com Discounted Calls | P.O. Box 157 Nantwich, Cheshire LW5 7XD | 0800 195 2544 |
| Dolphin Communication Solutions Ltd | Dolphin Communications Solutions Ltd | 509 Katherine Road Forest Gate London E7 8DR | 020 8586 6000 |
| Dot Comm Consultancy Ltd | |||
| DRD Communications Ltd | DRD Communications plc | Connect House 21 Willow Lane Mitcham CR4 4NA | 020 8288 1234 |
| Drumbeat Communications Ltd | Drumbeat Communications Ltd | Rowan House Sheldon Business Park Chippenham Wiltshire SN14 0SQ | 01249 467400 |
| Dtx Telecommunications Ltd | Dtx Network Services Ltd | Unit 24 President Buildings Savile Street East Sheffield S4 7UQ | 0845 125 61 61 |
| du Pré plc | du Pré plc | Vo-Tec Centre Hambridge Lane Newbury Berkshire RG14 5TN | 01635 555 555 |
| Dune Tele Ltd | DUNE | Suit 10, Eaton Place Business Centre 114 Washway Road Sale, Cheshire M33 7RF | 0161 374 4789 |
| DuoCall Communications Ltd | DuoCall Communications Ltd | Unit 6 Sycamore Centre Eastwood Trading Estate Rotherham S65 1EN | 08456 761000 |
| Du-Tel Ltd | |||
| DV02 Telecom Ltd | DV02 Telecom Ltd | Unit 12 - The Admiral Park Airport Services Road Portsmouth PO3 5RQ | 0870 300 1055 |
| DVM Solutions Ltd | DVM Solutions Ltd | 23 Mauncer Drive Sheffield S13 7JE | 08452 255883 |
| Dwarf Ltd | Dwarf | 60 Regent Place Birmingham B3 1UG | 0121 236 1888 |
| DX Telecom Ltd | DX Telecom Ltd | DX House P.O. Box 143 Swansea SA2 0WT | 0870 990 8008 |
| DX Tele-Solutions Ltd | DX Tele-Solutions | 4 Tansley View Wolverhampton WV2 1HT | 0870 896 4380 |
| DX Tele-Solutions Ltd | Talk Warehouse | 4 Tansley View Wolverhampton WV2 1HT | 0870 896 4380 |
| DXI Networks Ltd | DXI Networks | Service Management Centre DXI Networks Ltd 24 Chiswell Street London EC1Y 4TY | 020 7579 8299 |
| Dynamics Computer Consultants Ltd | Dynamics | 5e Longrock Industrial Estate Penzance Cornwall TR20 8HX | 01736-888123 |
| E7even UK Ltd | Touch Telecom | Suite C9 Powerhub Business Centre St. Peters Street Maidstone ME16 0ST | 0870 224 5122 |
| Easi-Call UK Ltd | |||
| Easi-tel Ltd | Easi-tel Ltd | 15 Riverside Studios Amethyst Road Newcastle Business Park Newcastle-Upon Tyne NE4 7YL | 0870 789 7788 |
| East Point Telecom Ltd | East Point Telecom | 15 Waveney Road Lowestoft Suffolk NR32 1SP | 01502 532732 |
| East Riding Telecom Ltd | East Riding Telecom Ltd | 4100 Park Approach Thorpe Park Leeds LS15 8GB | 08445 796979 |
| Easy Networks Ltd | Easy Networks Ltd | Unit 1.1 Central Point Kirpal Road Portsmouth PO3 6FH | 023 9277 8800 |
| Easy-Dial Ltd | Easy-Dial | P.O. Box 8213 Chiswick, London W4 3WR | 0870 120 2033 |
| Easynet | Easynet | 5 Thomas More Street Thomas More Square London E1W 1YW UK | 020 7032 5000 |
| Easynet Group Ltd | Picnic | Picnic PO Box 57952 London W4 5PD | 08702 222222 |
| Easynet Group Ltd | Skytalk | Head of Voice and Switch Development Easynet Ltd 1 Brick Lane LONDON E1 6PU | 020 7900 1226 |
| Easynet Ltd | Easynet Ltd | 5 Thomas More Street Thomas More Square London E1W 1YW | 0207 0325000 |
| Easytone Telecom (UK) Ltd | Easytone Telecom (UK) Ltd | 1st Floor 12-13 Little Newport Street London WC2H 7JJ | 0207 437 7123 |
| Ecam Solutions Ltd | Ecam Solutions Ltd | 289/293 Ballards Lane London N12 8NP | 0870 080 2333 |
| Echo Network Services | Echo Communications | Echo House 27-33 Burr Road London SW18 4SQ | 020 8870 4000 |
| Eclipse Networking Ltd | Eclipse Internet | Portland House Longbrook Street Exeter Devon EX4 6AB | 0845 122 4333 |
| Eclipse Telecom Networks Ltd | |||
| Ecocall Ltd | Ecocall Ltd | Ver House 23-25 High Street Redbourn, Hertfordshire AL3 7LE | 01582 793 007 |
| Ecomtel Ltd | Ecomtel | PO Box 5289 London SW11 3US | 020 7108 1678 |
| Economy Calls | Economy Calls | Churchill House Churchill Way Cardiff CF10 2HH | 0845 234 0200 |
| Ecosse Group Ltd | Openline Communications | Unit 7G Anniesland Ind. Estate Netherland Road Glasgow G13 1EU | 0141 950 2640 |
| ECS Telecommunications Ltd | Umer | 258 Hackney Road London E2 7SJ | 0870 145 8300 |
| ED Communications Ltd | ED Communications Ltd | Enterprise House Henfield Road Small Dole West Sussex BN5 9XH | 0870 010 7710 |
| Eden Business Support Ltd | Eden Business Support | Gibbs House Kennel Ride Ascot Berkshire SL5 7NT | 0870 224 0445 |
| Eden Communications | Eden Communications | 25 High Street Edenbridge Kent TN8 5AB | 01732 865 313 |
| Edge Solutions Ltd | |||
| Edirect Computers Ltd | |||
| Effective Communication Solutions Ltd | ECS Telecoms | 5 Gladstone Road Liverpool L19 1RR | 08450 515 030 |
| EFL Telecom Ltd | EFL Telecom | 5 Thursday Street Haydon End Swindon Wiltshire SN25 1RG | 0844 418 0188 |
| EIPS LTD | EIPS Ltd | 17 Lee Lane Horwich Bolton BL6 7BP | 08448 246060 |
| Eiretel | |||
| Eker International Ltd | Eker Telecom | Davina House 137-149 Goswell Road London EC1V 7ET | 0845 108 0557 |
| Elite Business Systems UK Ltd | Elite Business Systems UK Ltd | 26-27 Chartergate Quarry Park Close Moulton Park Northampton NN3 6QB | 0870 899 3355 |
| Elite Calls (UK) Ltd | Elite Calls | The Lockhouse Frogmore Road Aspley, Hemel Hempstead Herts HP3 9RW | 0870 0665651 |
| Elite Telecoms (Dorset) Ltd | Elite Telecoms (Dorset) Ltd | Suite 2, Cleveland Court Cleveland Road Bournemouth Dorset BH1 4QB | 01202 392 970 |
| Elitetele.com plc | Elitetele.com | Rainford Hall Crank Road Crank St Helens, Merseyside WA11 7RP | 0870 990 8000 |
| Elphinstone Communications Ltd | Elphinstone Communications | 295 Fenwick Road Giffnock, Glasgow G46 6UH | 0141 620 3000 |
| Emedia Telecom | Emedia Telecom | 32 Grove Place Bedford MK40 3JJ | 0845 226 0260 |
| Empha Tech Ltd | |||
| Emtel Ltd | Emtel | Mercury House Shipstones Business Centre Northgate Nottingham NG7 7FN | 0845 450 4556 |
| Enable Communications Ltd | Enable Communications | 27 Waters Edge Canterbury Kent CT1 1WX | 05602 963598 |
| Energy Telecom Ltd | Energy Telecom | Freepost Energy Telecom PO Box 6918 Derby DE1 9EL | 0870 755 6699 |
| Enhanced Network Services Ltd | Enhanced Networks Services Ltd | Trident One Styal Road Manchester M22 5XB | 020 3326 4231 |
| Enron Direct Ltd | |||
| Entacall Telecommunications Ltd | Entacall Telecommunications | Stafford Park 6 Telford Shropshire TF3 3AT | 08707 709 394 |
| Entanet International Ltd | Entacall Telecommunications | Stafford Park 6 Telford, Shropshire TF3 3AT | 0870 770 9656 |
| Enterprise Carrier Services Ltd | |||
| Entigy Ltd | Quik Talk | Imperial Chamber Prince Albert Street Crewe Cheshire CW1 2DX | 01270 212199 |
| Entrepreneur.com | |||
| Envy Telecom LTD | Envy Telecom Ltd | 169 New London Road Chelmsford Essex CM2 0AE | 0871 2241112 |
| E-Partner Telecom Ltd | E-Partner Telecom Ltd | Marathon House Olympic Business Park Drybridge Road Dundonald,Kilmarnock KA2 9AE | 01563 852230 |
| Equate Business Solutions Ltd | EQ8 Telecom | Suite 13 Pontsychan House Abersychan Industiral Estate Abersychan, Pontypool NP4 7BA | 0845 085 0052 |
| Equate Group Plc | Equate Group Ltd | 3 Watermill Way Weston Turville Bucks HP22 5SR | 01296 612 427 |
| Equip Communications Ltd | Equip Communications Ltd | Unit 8F Alder Road West Chirton (North) Ind Est NE29 8SD | 0191 270 8000 |
| Equip-IP Ltd | equ-IP | Albany House 14 Shute End Wokingham Berkshire RG40 1BJ | 0118 3231674 |
| Equitalk.co.uk Ltd | Equitalk | Innovation Centre Heyford Park Upper Heyford Oxon OX25 5HD | 0800 161 3837 |
| e-Shop UK Ltd | |||
| Essanet Ltd | BBTALK | 8 Cromwell Business Centre Howard Way Newport Pagnell Milton Keynes MK16 9QS | 01908 888327 |
| Esscom Communications Ltd | Esscom Communications Ltd | Century House Westcott Venture Park Westcott Bucks HP18 0XB | 08704 232 320 |
| Essensys Ltd | Essensys Ltd | 16th Floor Centre Point 103 New Oxford Street London WC1A 1DD | 020 3102 5252 |
| E-Tel Systems | E-Tel Systems | 1 Cwrt Pencoedtre Barry South Glamorgan CF62 9BS | 01446 741530 |
| Ethcom Ltd | |||
| Ethernet Communications | Ethernet Communications | Unit 9, Limefield House Limefield Brow Bury BL9 6QS | 0161 7633131 |
| Ethos Voice & Data - EVAD | EVAD | 124-128 City Road London EC1V 2NJ | 020 7253 4482 |
| ETS Communications Ltd | ETS Communications Ltd | Wakefield Road Horbury Wakefield West Yorkshire WF4 5HQ | 01924 237000 |
| Euphony Telecommunications Ltd | Euphony | Customer Services Department Euphony Telecommunications Ltd Belvedere, Basingstoke RG21 4HG | 01256 857000 |
| EurISP | EurISP Ltd | 6 Queensgate Huddersfield HD1 2RD | 0871 2202233 |
| Eurolink Telecom Ltd | Eurolink Telecom | Swan House Bonds Mill Estate Stonehouse Glos GL10 3RF | 08450 755 500 |
| Europa Network (UK) Ltd | Europa Networks | Warwick House 41 Spring Road Hall Green Birmingham B11 3EA | 0870 756 0646 |
| Europa.net Ltd | Europacom.net | The Rectory Stoneham Park Eastleigh S050 9NW | 023080 646 305 |
| European Communications | European Communications | Communications House 17 Chesham Avenue Flixton Manchester M41 8SS | 08709 500 074 |
| European Telecom Solutions | European Telecom Solutions | PO Box 104 Neath SA11 2WZ | 01639 814 800 |
| European Utility Management | European Utility Management | Liberty House 222 Regents Street London W1B 5TR | 0207 0601900 |
| Eurotel Communications Ltd | Eurotel Communications | HB House Foleshill Enterprise Park Courtaulds Way Coventry CV6 5NX | 0870 750 9999 |
| Eurotel Ltd | Eurotel Ltd | Empire House Mulcture Hall Road Halifax HX1 1SP | 01422 864 097 |
| Everlast Systems Ltd | Everlast Systems Ltd | 81 High Street Salisbury House Potters Bar EN9 5AS | 0845 2000512 |
| Evolution Voice and Data PLC | Evolution Global Networks | 36 Great St. Helens London EC3A 6AP | 020 7628 2800 |
| Evolve Telecom Ltd | Evolve Telecom | Suite 1-2 Chalkwell Lawns 648-656 London Road Westcliff on Sea Essex SS0 9HR | 0870 333 3734 |
| Excalibur Communications Ltd | Excalibur Communications | 6 Hill Road Clevedon N Somerset BS21 7NE | 0845 0179 535 |
| Excel Communications (UK) Ltd | |||
| Excel Telecom Ltd | |||
| Excel Telecommunications Network Ltd | Excel Telecommunications Network Ltd | Greenlands Business Centre Studley Road Redditch B98 0NZ | 01527 527 747 |
| Excell Network Solutions Ltd | |||
| Exchange Communications Ltd | Exchange Communications Ltd | Exchange House Kerr Street Kirkintilloch Glasgow G66 1LF | 0141 776 5851 |
| Exchange UK | |||
| Executel Ltd | Executel | West Wing Cameron House Metro Centre Gateshead NE11 9XW | 0191 493 1111 |
| Expanse (UK) Communications Ltd | ECL Telecom | The Old Rectory Church Road Sevington, Ashford Kent TN24 0LD | 0870 242 1718 |
| Expedite Total Office Solutions Ltd | Expedite Total Office Solutions Ltd | 9 Lynx Crescent Weston Super Mare BS24 9DJ | 01934 422 222 |
| Exstream Networks Ltd | |||
| Eze-Talk | |||
| F H Brown Office Technologies Ltd | |||
| F1 Comms Ltd | F1 Communications Ltd | 22 Chaldon Road Caterham-on-the-Hill Caterham Surrey CR3 5PE | 020 7101 7500 |
| Fab Spider | Fab Spider | Ripponden Mill Mill Fold Ripponden HX6 4DH | 01422 825712 |
| Face Value Ltd | Face Value Ltd | Charles House Toutley Industrial Estate Berkshire RG41 1QN | 0118 977 1010 |
| Facilities Management | FMUK | Saddleworth Business Centre Huddersfield Road Delph OL3 5DF | 01457 820022 |
| Fastnet International Ltd | Fastnet International | Shaftsbury Court 95 Ditchling Road Brighton East Sussex BN1 4ST | 01273 662 888 |
| Fax Information Services Ltd | Telfis | 7th Floor, Times House Throwley Way Sutton Surrey SM1 4AF | 0208 652 1100 |
| Fax2Mail Ltd | Fax2Mail | Venture West New Greenham Park Newbury Berks RG16 6HN | 0870 114 1140 |
| FCP Communications | FCP Communications | 19-20 Bourne Court Southend Road Woodford Green Essex IG8 8HD | 01279 60 32 91 |
| Fenix Networks Ltd | Fenix Networks Ltd | Unit 3 Montgomery Business Park 38 Montgomery Road Belfast BT6 9HL | 028 90400400 |
| FHTM Ltd | FHTM Ltd | United Business Centres Plc Midsummer Court 314 Midsummer Boulevard Central Milton Keynes MK9 2UB | 0870 141 9619 |
| Fibrestream Ltd | Fibrestream Ltd | Owthorne Manor Withernsea East Yorkshire HU19 2AT | 01482 778554 |
| Fidelity Group Ltd | Fidelity Group Ltd | Newton House Newtown Road Henley on Thames OXON RG9 1HG | |
| Fineline Communications Ltd | Tempest Telecom | Third Melrose Roxburghshire TD6 9DR | 08700 505 015 |
| Fintech Consultants Ltd | Fintech Communications | 5 St John's Lane London EC1M 4BH | 020 7549 1654 |
| Fire Telecom Ltd | |||
| Firefly Enterprises Ltd | Firefly Internet | Unit 12 Beckford Business Centre Beckford Street Hamilton ML3 6NN | 0870 141 7114 |
| First Active Communications Ltd | |||
| First Call Communications Ltd | i Communications | 3-4 Byron Place Clifton Bristol BS8 1JT | 0117 952 9189 |
| First Choice Communications Ltd | First Choice Communications Ltd | Oak Bank Business Centre Mickley Hall Lane Broomhall Nantwich, Cheshire CW5 8AH | 01270 440 141 |
| First Choice Mobiles Ltd | First Choice Mobiles First | Southern Gateway Speke Boulevard Liverpool | 01514 865 222 |
| First European Telecom Ltd | First European Telecom Ltd | Ramsay Court 111 Ecclesall Road South Sheffield S11 9PH | 0800 195 9200 |
| First Global Telecom Ltd | First Global Telecom Ltd | Tottenham Green Enterprise Centre Town Hall Approach London N15 4RX | 0870 224 1120 |
| First Group Dynamics Ltd | First Group Dynamics Ltd | Palehouse Barn, Palehouse Common Framfield Uckfield East Sussex TN22 5QY | 01825 890 099 |
| First Line Support Ltd | First Line IT | Hamilton House 1B Howard Street Oxford OX4 3AY | 01865 260 220 |
| First National Telecom Services Ltd | gotalk | 3rd Floor The Argyle Centre York Street Ramsgate CT11 9DS | 0800 097 7777 |
| First Voice Group Ltd | |||
| First4Telecoms Ltd | |||
| Fixed Line Solutions Ltd | Fixed Line Solutions Ltd | 7 Hunter Street Chester CH1 2HR | 0844 579 1581 |
| Fizz Telecom Ltd | Fizz Telecom Ltd | CBS House, The Courtyard Alban Park Hatfield Road St Albans, Hertfordshire AL4 0LA | 0845 672 7272 |
| Flat Rate Telecom | Flat Rate Telecom | 46 Clerkenwell Close London ECR1 0AT | 0845 223 7500 |
| Floyds Office Equipment Ltd T/A CCF Telecoms | CCF Telecoms | 139 Lynchford Road Farnborough Hants GU14 6HD | 0844 8269 654 |
| FLR Spectron Ltd | FLR Spectron | 4th Floor, Berwick House 8-10 Knoll Rise Orpington Kent BR6 0EL | 0870 997 0000 |
| Fluid Network Solutions Ltd | |||
| Fluidata Ltd | FLUIDATA | 300 Kensal Road London W10 5BE | 0845 868 7848 |
| Flying Dragon Ltd | Flying Dragon | 6 Sillwood Court Montpelier Road Brighton BN1 2NL | 01273 205435 |
| Flying Start Brokers Ltd | Flying Start Brokers Ltd | 97 Greenwood Ave Blackpool Lancashire FY1 6PR | 01253 769720 |
| FMI Ltd | FMI Telecom | Voice Support Queens House 1 Leicester Place London WC2H 7BP | 020 7758 0848 |
| Focus 4 U Ltd | Focus 4 U Ltd | Unit H, Hove Tech Centre St Josephs Close Hove East Sussex BN3 7ES | 0845 450 5225 |
| Foehn Ltd | Foehn Ltd | Marcar House Parkshot Richmond Surrey TW9 2RG | 020 8940 7919 |
| Fokus Network Solutions Ltd | Fokus Network Solutions Ltd | The Studio Quarry Hill Box Wiltshire SN13 8LP | 08713 101015 |
| Forces Communications Ltd | Forces Communications Ltd | Bradley Court Off Maple Road Castle Donington DE74 2UT | 0845 270 2476 |
| Forces Networks Ltd | Forces Networks Ltd | Office 1 The Barns Caddsdown Ind Park Bideford Devon EX39 3RD | 01237 426559 |
| Formjet Plc | Formjet Plc | Innovation House Windsor Place Faraday Road Crawley RH10 9TF | 0870 606 1670 |
| FP Telekom Ltd | FP Telekom | Hayleys Manor Upland Road Epping, Essex CM16 6PQ | 01992 563 840 |
| Fractal Telecom Services Ltd | Fractal Telecom | 240 Branston Road Burton Upon Trent DE14 3BT | 0870 410 8989 |
| FreeCall UK Ltd | |||
| FreeClix Ltd | Freeclix Ltd | 110 Prince of Wales Road Norwich NR1 1NS | 0870 987 3000 |
| Freecom Internet Services Ltd | Freecom.net | Freecom Internet Services Ltd E4 Hagley Court North The Waterfront, Level Street Brierley Hill DY5 1XF | 08444 720022 |
| Freecomm Services | Freecomm Services | 64 Fairfield Green Whitley Bay Tyne & Wear NE25 9SD | 0191 252 1543 |
| Freedom Technology | Freedom Technology | Wixford Business Park George Elm Lane Alcester B50 4JS | 01789 772 009 |
| FreedomCall Ltd | FreedomCall | Withypitts Farmhouse Selsfield Road Turners Hills West Sussex RH10 4PP | 0800 279 6050 |
| FreedomConnect Ltd | FreedomConnect Ltd | Olds Approach Tolpits Lane Watford, Hertfordshire WD18 9RX | 01923 654 097 |
| Freedomtel Ltd | Freedomtel | 18 Hanover Square London W1S 1HX | 020 3008 2566 |
| Freestyle Communications | Freestyle Communications | 37 Alexander Gibson Way Motherwell ML1 3FA | 0870 403 0121 |
| Freetime Communications Ltd | |||
| Frontier Systems Ltd | Frontier Systems Ltd | Warwick House 9 Warwick Street London W1B 5LY | 020 7440 1811 |
| Frontier Systems Ltd | Voiceflex | Warwick House 9 Warwick Street London W1B 5LY | 020 7440 1811 |
| Frontier Voice and Data Ltd | Frontier Voice and Data Ltd | Longleys Rye Road Sandhurst, Cranbrook Kent TN18 5PG | 0845 301 4100 |
| Fujitsu Services Ltd | Fujitsu Services Ltd | 51 Homer Road Solihull 6 Homer Road West Midlands B91 3QJ | 0843 354 7442 |
| Fusion Media Networks Ltd | Fusion Media Networks Ltd | 33/41 Thamesgate House Victoria Avenue Southend on Sea Essex SS2 6DF | 08707 709101 |
| Future Data Networks Ltd | Future Data Networks Ltd | Trafalgar House Trafalgar Wharf 223 Southampton Road Hampshire PO6 4PY | 02392 808 100 |
| Future Reliance Ltd | Future Reliance | 119 Richmond Road Kingston Upon Thames Surrey KT2 5BX | 0845 450 3880 |
| Future Technologies | Future Technologies | Waterside House Cliffe Commercial Park Huddersfield HD1 3JD | 01484 345400 |
| Futures Capital Ltd | |||
| G3 Network Services Ltd | G3 Network Services Ltd/G3NS Ltd | 3rd Floor Harling House 47-51 Great Suffolk Street London SE1 0BS | 020 7075 1400 |
| G4orce Telecom Ltd | G4 | PO Box 69 London NW6 2JS | 020 7419 7528 |
| Gage Networks LLP | Gage Networks | Burley House Burley Rutland LE15 7TE | 0800 0155989 |
| Gamma Telecom Holdings Ltd | |||
| Garnell Corporate Communications Ltd | Garnell Corporate Communications Ltd | Arundel House Garnell Business Park Brownfields Welwyn Garden City, Herts AL7 1AY | 01707 321100 |
| Gateway Telecom Ltd | Gateway Telecom Ltd | Ephraim Phillips House 54-76 Bissell Street Birmingham B5 7HP | 0845 456 1092 |
| GB Phone Solutions | |||
| GB Telecom (Scotland) Ltd | GB Telecom (Scotland) Ltd | Galamoor House Netherdale Galashiels TD1 3EY | 01896 752 607 |
| GCI Communications Ltd | GCI Com | Global House Allenby Business Village 2a Crofton Close Lincoln LN3 4NT | 08700 808080 |
| GCI Communications Ltd | Talk Talk Business | Global House Allenby Business Village 2a Crofton Close Lincoln LN3 4NT | 0870 6071038 |
| GCM Services Ltd | GCM Services Ltd | Unit 40 Greenway Business Centre Harlow Essex CM19 5QE | 01889 574476 |
| Gee2Gee Ltd | Gee2Gee Telecom | 70 Godstow Road Abbey Wood SE2 9AZ | 0844 8733604 |
| GEM Communications | GEM Communications | The Bank 97 Buttermarket Street Warrington WA1 2NL | 0151 495 2154 |
| Gemini Communications | Gemini Communications | Unit 11 Petteril Side Harraby Green Business Park Carlisle CA1 2SQ | 01228 516 500 |
| Gemini Telecom Ltd | Gemini Telecom Ltd | Waterside Trafford Park Manchester M17 1WD | 0870 224 2031 |
| Gemini TML Ltd | Gemini TML Ltd | Unit 11, Harraby Green Business Park Carlisle Cumbria CA1 2SQ | 01228 516500 |
| Gemini UK Solutions | Gemini | 306 East Wing Sterling House Loughton Essex 1G10 3TS | 020 3328 3404 |
| General Telecom (UK) Ltd | Nexus | P.O. Box 126 St Helens WA11 7FL | 0870 758 5555 |
| General Telephone & Telegraph Ltd | |||
| Generation Telecom | |||
| Genesis Communication Ltd | Genesis Communications | Waterforld Park Rochdale Road Bury BL9 7BJ | 0870 4427070 |
| Genesis Voice and Data Ltd | Genesis Voice and Data Ltd | Trevelyan House 117 Chorley Road Swinton, Greater Manchester M27 4AA | 0870 750 2336 |
| Genzee Ltd | Genzee Voice | 31 Twickenham Gardens Harrow HA3 6BG | 0800 047 0390 |
| GET Communications | GET Communications | Pendle Innovation Centre Brook Street Nelson Lancashire BB9 9PU | 0845 838 9840 |
| GHM Communications | GHM Communications | Unit 5 TBAC Business Centre Osney Mead Oxford OX2 ODR | |
| GIOTECH LTD | UK1 Internet | Bryson House, 1st Floor 131 Church Elm Lane Dagenham Essex RM10 9RR | 020 7183 2494 |
| GJ Beckett and Associates Ltd | Beckett Telecom | Gj Beckett & Associates Ltd Units 6-7 Saturn House Calleva Park, Aldermaston Berkshire RG7 8HA | 0118 9409000 |
| GlemNet Ltd | GlemNet Ltd | 112 Beckenham Road Beckenham, Kent BR3 4RH | 020 8639 0230 |
| Glide Utilities Ltd | Glide | Cornwall House 31 Lionel Street Birmingham B3 1AP | 08006 348 631 |
| Global 4 Communications Ltd | Global 4 Communications Ltd | Global House Rusper Road Horsham RH12 4QR | 01403 272 910 |
| Global Affinity Plc | Global Affinity | GA House 16 Mandeville Close Watford Herts WD7 4SF | 01923 448 840 |
| Global Business Technology Ltd | Global Business Technology | Hornby Street Bury BL9 5BN | 0161 705 6200 |
| Global Comms & Consulting Ltd | GCC Networks | Wardens House 4, Broad Street Stamford Lincolnshire PE9 1PB | 0870 420 4013 |
| Global Crossing (UK) Ltd | Global Crossing CPS | Oakwood Chineham Business Park Clockford Lane Basingstoke, Hants RG24 8WB | 0800 528 5028 |
| Global Networks International Ltd | Global Networks International Ltd | 16 Commercial Way Abbey Road London NW10 7XF | 0845 2418000 |
| Global Nomi Telecomunicacoes E Servicos LDA | Nomi | Global Nomi c/o 4th Floor, The Tower Building 11 York Road London SE1 7NX | 020 7620 0700 |
| Global Telecom Ltd | Global Telecom Ltd | PO Box 2059 Watford Herts WD17 1XR | 08700 55 56 57 |
| Global Telecoms Partners Ltd | |||
| Globalink Telecommunications Ltd | |||
| Globalnet Telecom | Globalnet Telecom Ltd | Swan Court Waterhouse Street Hemel Hempstead Herts HP1 1EA | 0870 9502400 |
| Globe Connect Ltd | Globe Connect Ltd | 90 Worcester Road Hagley Stourbridge West Midlands DY9 0NJ | 01562 888215 |
| Glow Telecom Ltd | |||
| GM Convergence Ltd | GM Convergence Ltd | 113 Lillie Road Fulham London SW6 7SX | 020 3080 0707 |
| Go Worldwide Communications Ltd | |||
| Gold Telecom Ltd | Gold Telecom | Unit 1 St John's Mews 13 St John's Road Hampton Wick Kingston Upon Thames, Surrey KT1 4AN | 0870 264 4111 |
| Gooch ICT Ltd | Gooch ICT Ltd | Services Division ICT Warehouse 56 Coulson Road Lincoln LN5 8BH | 01522 546624 |
| Goodman Blue Ltd | |||
| Gordon Harwood Computers Ltd | Gordon Harwood Computers Ltd | Derwent House NewStrewet Alfreton Derbyshire DE55 7BP | 0870 774 1234 |
| GOUK Ltd | Equant | 217 Bath Road Slough SL1 4AA | 020 8321 4000 |
| GP Network Solutions Ltd | GP Network Solutions Ltd | 56a Albury Road Merstham Surrey RH1 3LS | 01737 646 770 |
| GP Telecom Ltd | GP Telecom Ltd | 75-77 Drake Street Rochdale Lancs OL16 1SB | 0845 3456787 |
| GPS Telecoms Ltd | GPS Telecoms Ltd | Suite 9 Stowmarket Business Centre Ernest Nunn Road Stowmarket Suffolk IP14 2ED | 0870 730 7000 |
| GR Comms Ltd | GR Comms Ltd | Peter House Oxford Street Manchester M1 5AN | 08704 232320 |
| Gradwell dot com Ltd | Gradwell dot com Ltd | 26 Cheltenham St Bath BA2 3EX | 01225 800800 |
| Graphta Ltd | GRAPHTA LTD | Blenheim House Broomhill Road Kimberley Nottingham NG16 2LZ | 0845 058 5001 |
| Green Fields Technology | Green Fields | 93-99 Upper Richmond Road London SW15 2TG | 0845 200 7800 |
| Green House Telecom | Green House Telecom | Green House Hebden Bridge HX7 7JR | 01422 844431 |
| Green Planet Communications Ltd | Green Planet Communications Ltd | 1 Yr Hen Felin Castlemorris Haverfordwest Pembs SA62 5EN | 0844 880 1122 |
| Green Rate Telecom Ltd | Green Rate | 1 Innova Business Park Elecric Avenue Enfield Middlesex EN3 7XU | 0845 0268912 |
| Greencom Europe Ltd | Greencom Europe Ltd | 1 Innova Business Park Electric Avenue Enfield Middlesex EN3 7XU | 08458 722 080 |
| Greendog Networks Ltd | Greendog Networks Ltd | Barking House Farndon Road Market Harborough Leicetershire LE16 9NP | 0845 303 8335 |
| Greenstock Ltd | |||
| Greystone Telecom Ltd | |||
| Griffin Information Systems Ltd | Griffin Internet | 20 St Christopher's Way Pride Park Derby DE24 8JY | 0870 8040804 |
| GTEQ Solutions Ltd | GTEQ Solutions Ltd | Global House Adlington Estate Adlington SK10 4BF | 0844 811 0844 |
| Hale Network Solutions Ltd | Hale Network Solutions Ltd | 23 Ashley Road Altrincham Cheshire WA14 2DP | 0161 929 1580 |
| Halo Communications Ltd | |||
| Harmony Solutions Ltd | Harmony Solutions Ltd | Unit 9A, Building 2 Shamrock Quay William Street Southampton SO14 5QL | 0870 423 4200 |
| Hartel Communications Ltd | Hartel Communications Ltd | Hartel House 395 Birmingham Road Great Barr Brimingham B43 7AR | 0121 357 0707 |
| Hartwood Services | Hartwood Communications | 70 Armstrong Road Old Basing Basingstoke RG24 8NU | 01256 334755 |
| HashNine Managed Communications Ltd | HashNine Managed Communications Ltd | 22 Chaldon Road Caterham-on-the-Hill Caterham CR3 5PE | 0207 101 7500 |
| Haven Communications | Haven Communications | 97 Charles Street Milford Haven Pembrokeshire SA73 2HL | 0870 78 79 700 |
| HB Telecom (UK) Ltd | HB Communications | HB House Foleshill Enterprise Park Courtaulds Way Coventry CV6 5NX | 0870 750 3666 |
| HCC.UK.COM Ltd | HC Communications | The Old School School Road Miskin Pontyclun, RCT CF72 8PG | 01443 449987 |
| HCS Telecom Ltd | HCS Telecom | 11 Silver Lane West Sussex RH14 9RP | 0800 018 2770 |
| HD Telecom Ltd | HD Telecom Ltd | Trident House 596-598 High Road Woodford Green Essex IG8 0PS | 0870 3004545 |
| Heart Telecom Ltd | Heart Telecom | 11 Faraday Building Nottingham Science and Technology Park Nottingham NG7 2QP | 0845 644 7750 |
| Heathrow Communications Ltd | |||
| Hello Telecom Ltd | |||
| HFH Communications | |||
| High Span Networks Ltd | High Span | 14 Alban Park Hatfield Road St. Albans Herts AL4 0JJ | 01727 810 860 |
| Highland Network Ltd | Highland Network Ltd | 10 Lotvand Street Inverness, Highland IV1 1PA | 01463 712 045 |
| HighSpeed Office Ltd | hSo | Epworth House 25 City Road London EC1Y 1AA | 020 7847 4500 |
| Hiline Communications Ltd | Hiline Communications Ltd | Woodgates Pardhouse Lane Stanford Bridge Worcester WR6 6RX | 01886 812731 |
| Hi-Tech Communications Services Ltd T/A net:telecom | net:telecom | The Chase Business Centre 39-41 Chase Side Southgate London N14 5BP | 0870 872 0202 |
| HJS Essentia Ltd | HJS Essentia Ltd | 12-14 Carlton Place Southampton SO15 2EA | 023 8023 4222 |
| Hobbs Parker 2000 Ltd | |||
| Holistic Telecom Ltd | CallSpend | c/o Holistic Telecom Ltd 2nd Floor 145-157 St John Street London EC1V 4PY | 0845 838 6370 |
| Holistic Telecom Ltd | Holistic Telecom Ltd | 2nd Floor 145-157 St John Street London EC1V 4PY | 0870 432 8370 |
| Horizon Telecom Networks Ltd | Horizon Telecom Networks Ltd | Unit 4, Longwood Court Love Lane Cirencester Gloucester GL7 1YG | 01285 656 421 |
| Hotline Energy Plc | |||
| Housing Communications Ltd | Housing Communications | Bridge Suite, Severnside House Brassey Road Old Potts Way Shrewsbury SY3 7FA | 01743 356 999 |
| Hubtel Communications Ltd | Hubtel Communications Ltd | Unit C6 HRS House Garretts Green Lane Garretts Green Birmingham BB33 0UE | 0870 7744075 |
| Hugh Symons | Hugh Symons | Alder Hills Park 16 Alder Hills Park Poole Dorset BH16 4AR | 01202 714316 |
| Hughes Network Systems Ltd | HughesNet | Sunrise Parkway Linford Wood Milton Keynes MK14 6LS | 01908 425300 |
| Hullabaloo Communications Ltd | Hullabaloo Communications Ltd | Nelson House 1a Church Street Epsom KT17 4PF | 0845 612 8585 |
| Hutchison Ports UK Ltd | COMTEL | Tomline House The Dock Felixstowe IP11 3SY | 01394 604611 |
| I Active | I Active | 225 Norberry Road Norberry London SW16 4TU | 07932 017 575 |
| I -NAP LTD | SURELINE | 16 Old Bailey London EC4M 7EG | 020 7537 8003 |
| I.net Internet Services Ltd | I.net | 1B Market Place Grantham Lincolnshire NG31 6LQ | 01476 512 920 |
| I3c Ltd | |||
| Icom | Icom | Unit 3 Brent Mill Business Park South Brent TQ10 9YT | 01364 649310 |
| ICOM Ltd | |||
| Icom Telecommunications Ltd | Icom Telecommunications Ltd | 3 Kings Row Armstrong Road Maidstone Kent ME15 6AQ | 01622 655218 |
| iCommunicate Group Ltd | iCommunicate Group Ltd | 40 Marsh Wall London E14 9TP | 0845 1740010 |
| ICS 1989 Ltd | |||
| ICS Call Options Ltd | ICS Call Options | 40 Devonshire Road Bolton BL1 4DQ | 01204 848 414 |
| ICS Intelligent Communication Services Ltd | ICS Intelligent Communication Services Ltd | Norlands Colham Green Road Hillingdon, Middlesex UB8 3QQ | 01895 232 917 |
| ICS Networks Ltd | ICS Networks Ltd | The Granary 50 Barton Road Worsley Manchester M28 2EB | 0845 017 9000 |
| ICUK | ICUK | 240a Pampisford Road Croydon Surrey CR2 6DB | 0845 0099175 |
| i-dash Ltd | i-dash Ltd | Suite 3 Orchard House Tebbutts Road St Neots Cambs PE19 1AW | 0845 026 1145 |
| iData Solutions (UK) Ltd | I Data Solutions (UK) Ltd | Parkgate House Welsh Road Deeside Flintshire CH5 2LR | 084444 180266 |
| Ideal Converged Technologies Ltd | Ideal Converged Technologies Ltd | 10 Bridge Street Thetford Norfolk IP22 1DY | 01842 822 485 |
| Ideal Telecoms Ltd | Ideal Telecoms Ltd | HPF House Park Road Toddington Bedfordshire LU5 6HG | 08006 529 863 |
| IDN Telecom Plc | |||
| IDNet | IDNet | The Spirella Building Letchworth Herts SG6 4ET | 0800 0267 237 |
| IDT Direct Ltd | |||
| Ifon Ltd | Ifon Broadband Communication | The Old Printworks Wellington Street Thame Oxon OX9 3BN | 00844 220001 |
| IGC Fixed Line Ltd | IGC Fixed Line Ltd | 8&9 Horsted Square Bellbrook Business Park Uckfield TN22 1QG | 0845 257 7003 |
| Ignite Service Provider Ltd | Ignite Service Provider Ltd | 3 Buckingham Court Rectory Lane Loughton Essex IG10 2QZ | 0845 9000 417 |
| iHub Ltd | iHub Ltd | Long Barn Amport Hants SP11 8JB | 01264 889 094 |
| Image Telecom Solutions Ltd | ITS | 14 Market Street Marple, Stockport SK6 7AD | 0845 345 3600 |
| Imagine Media Ltd | Imagine Media | 2nd Floor 145-157 St John Street London EC1V 4PY | 020 7100 5531 |
| Imanage Ltd | Imanage Communications | 370-372 Manchester Road Oldham OL9 7PG | 0870 9500150 |
| Imerja Ltd | Imerja Ltd | Hallmark House, Paragon Business park, Chorley New Road Horwich Bolton BL6 6HG | 0870 8611488 |
| Impact Business Services Ltd | IMPACT TELECOM | Dyehouse Drive Cleckheaton West Yorks BD19 4TY | 0870 0433 796 |
| Impello Ltd | First Telecom | Olympus Plaza Olympus Business Park Gloucester GL2 4NG | 0845 215 1640 |
| In Call Solutions Ltd | In Call Solutions Ltd | Suite 3, The Granary 50 Barton Road Worsley Manchester M28 2EB | 0845 017 9000 |
| Inbound Solutions Ltd | Inbound Solutions Ltd | 8 Greenham Park Common Road Witchford Ely CB6 2HY | 0800-0776907 |
| Incom Business Systems | Incom Business Systems | Waterside, Trafford Wharf Road Manchester M17 1WD | 0161 876 5353 |
| Incom Network Services | BBI | Incom House Waterside Trafford Park Manchester M17 1WD | 0161 875 6353 |
| incovo Ltd | incovo Ltd | Almondview Park Livingstone West Lothian EH54 6QB | 0845 450 1780 |
| Independent Telecom Brokers Ltd | Independent Telecom Brokers Ltd | ISDN Buildings Ingatestone Road Stock Essex CM4 9PD | 08456 126 123 |
| Independent Telecommuications Consultants Ltd | Independent Telecommunications Consultants Limted | Chaucer House 4-6 Upper Marlborough Road St Albans Hertfordshire AL1 3UR | 08451 270 270 |
| Indexscope Ltd t/a ABC NET | ABC TEL | Hillingdon House 386-388 Kenton Road Harrow Middlesex HA3 9DP | 0845 004 6006 |
| Indiecom Ltd | Indiecom | 24 Great Chapel Street London W1F 8FS | 0207 439 0116 |
| Indigo IT Ltd | Indigo TeamCall | Unit 12e The Lansbury Estate Lower Guildford Road Knaphill, Surrey GU21 2EP | 0870 8987089 |
| Indigo Telecom Group | Indigo Telecom Group | Castlegate Business Park Caldicot Monmouthshire NP26 5AA | 01291 435500 |
| Inenco Group Ltd | |||
| INET Telecoms Ltd (Voipfone) | VOIPFONE | Inet Telecoms Ltd 227 Marsh Wall London E14 9SD | 020 7043 5555 |
| INFOMEDIA TELECOM LTD | |||
| Information Technology Communications Ltd | BT Support Services Ltd | 2-8 Park Road Lytham St Annes Lancashire FY8 1QX | 01253 783990 |
| Information Technology Communications Ltd | Information Technology Communications Ltd | 2-8 Park Road Lytham St Annes Lancashire FY8 1QX | 01253 783990 |
| Infosystems Ltd | Infosystems Ltd | The Barn, Bridge Farm Holt Lane, Ashby Magna Lutterworth Leicestershire LE17 5NJ | 01455 201 000 |
| Inframatic Ltd | Inframatic Telecom | 6 Beech Tree Glade London E4 6BG | 020 8529 4901 |
| Ingenitech Ltd | Ingenitech Ltd | 11a ladybridge Road Cheadle Hulme Cheshire SK8 5LL | 0161 485 5464 |
| Initial Technologies Ltd | Initial Technologies Ltd | 65 Long Meadows Chorley Preston Lancs PR7 2YB | 01257 263 768 |
| Innotech Consultants Ltd T/A CTI | CTI Connections | 27 Trinity Street St. Austell Cornwall PL25 5LS | 01726 879 285 |
| Innzone Ltd | Innzone Ltd | Premier House 112 Station Road Edgware Middx HA8 7BJ | 0870 9919205 |
| Insite Management Services Ltd | Insite Management Services Ltd | 3 Birkheads Road Reigate RH2 0AR | 0845 070 0103 |
| In-Tech Telecom Ltd | In-Tech Telecom Ltd | Astro House 16 Brunel Way Segenworth East Industrial Estate Fareham, Hampshire PO15 5TX | 0870 607 060 |
| InTechnology Plc | InTechnology | Nidderdale House Beckwith Knowle Otley Road Harrogate HG3 1SA | 01423 850000 |
| InTechnology Plc | Intechnology Plc | Commensus House Worton Drive Reading Berks RG2 0TG | 01189 168 850 |
| Integra-ICT Ltd | Integra-ICT Ltd | T/A Anglia Telecoms Gateshead Close Sandy Beds SG19 1RS | 01767 692 792 |
| Integrated Business Systems Ltd | Integrated Business Systems Ltd | 24 Cottesbrooke Park Heartlands Business Park Daventry Northamptonshire NN11 8YL | 01327 302999 |
| Integrated Business Telecommunications Ltd | Integrated Business Telecommunications Ltd | Charles House Lower Road Great Amwell Ware, Hertfordshire SG12 9TZ | 0845 678 0777 |
| Integrated Communications for Business (UK) Ltd | Integrated Communications for Business (UK) Ltd | Highlands house Basingstoke Road Spencers Wood Reading, Berkshire RG7 1NT | 0870 848 5600 |
| Integrated Digital Services Ltd | IDS | Grange Court Raby Mere Road Raby Wirral CH63 4JH | 0151 353 3838 |
| Intel Ltd | Intel Ltd | 16 Shearway Business Park Folkestone Kent CT19 4RH | 0845 869 5253 |
| Intelesis Ltd | Billsavers.co.uk | Unit 7, First Floor Offices Canal Works Cadman Street Sheffield S4 7ZG | 0870 4609967 |
| Intelligent Network Services (UK) Ltd | Freephone Marketing | 50-52 Chorley Road Westhoughton Bolton BL5 3PR | 01942 845 503 |
| Intelligent Network Services (UK) Ltd | Intelligent Network Telecom | Wingates House 50-52 Chorley Road Westhoughton Bolton BL5 3PR | 0871 871 6781 |
| Intelligent Networks Ltd | INW | Upper Floors 10/12 Hightown Sandbach Cheshire CW11 1AE | 0845 456 5544 |
| Interactive (Telecoms) Ltd | Interactive (Telecoms) Ltd | Vittoria House 1-7 Vittoria Street Birmingham B1 3ND | 0845 300 8998 |
| Interactive Call Centre Solutions Ltd | Interactive Call Centre Solutions Ltd | Pavailion Buildings 20 Old Steine Brighton & Hove City East Sussex BN3 2PD | 01273 845 599 |
| Intercity Mobile Communications Ltd | Intercity | 101-114 Holloway Head Birmingham B1 1QP | 0121 643 7373 |
| Interface Advantage Ltd | Interface Advantage | Abbey House 1650 Arlington Business Park Theale Reading RG7 4SA | |
| Intergr8 Voice and Data Ltd | INTEGR8 | 5 Tempo House 15 Falcon Road LONDON SW11 2PJ | 0845 225 2202 |
| Intergrate (Europe) Ltd | Intergrate | Dominions House Queen Street Cardiff CF10 2AR | 0870 899 1010 |
| Inter-Group Communications Ltd | Inter-Group Communications Ltd | 113a Norwood Road Southport Merseyside PR8 6EL | 0800 919306 |
| International Business Networks Ltd | IBN Connect | Seven, The Power House Higham Mead Chesham HP5 2AH | 0800 9555 300 |
| International Telecom Brokers Ltd | |||
| International Telecom Plc | IT plc | 46 Clerkenwell Close London EC1R 0AT | 020 7216 9000 |
| Internet For Business Ltd | IFB Telecom | 387 Union Street Aberdeen Aberdeenshire AB11 6BX | 0800 027 0110 |
| Internet Projects Ltd | Internet Projects Ltd | European Communications Centre Flag Business Exchange Vicarage Farm Road Peterborough PE1 5TX | 0870 8922 111 |
| Internet Services (EU) Ltd | Internet Services | Internet Service (EU) Ltd 196 High Road Wood Green London N22 8HH | 0870 0053147 |
| Internetworks Mobile Ltd | Shropshire Telecom Ltd | Maxi House Halesfield 20 Telford TF7 4QU | 01952 684 333 |
| Internetworks Telecom Ltd | |||
| Interoute Communications Ltd | Interoute Communications Ltd | Walbrook Building 195 Marsh Wall London E14 9SG | 020 7025 9000 |
| Intersonic Ltd | Int2one | Intersonic House 10 Vincent Street Bradford West Yorkshire BD1 2NT | 08456 44 3733 |
| Intouch Advance Ltd | Intouch Advance Ltd | Mercury Quays Ashley Lane Shipley West Yorkshire BD17 7DB | 0844-5680000 |
| IntraLAN Telecom Ltd | IntraLAN Telecom Ltd | Kings Avenue House Kings Avenue New Malden Surrey KT3 4DY | 020 8401 7000 |
| Intramation Ltd | Intramation Ltd | 8 Durham Lane West Moor Park Armthorpe Doncaster DN3 3FE | 01302 836090 |
| Introcom Corporation | Introcom | 21 Turvey Lane Long Whatton Loughborough LE12 5DN | 0870 7946601 |
| Intuitive Systems & Networks Ltd | Intuitive Systems & Networks Ltd | PO Box 6215 Greenham Thatcham Berkshire RG19 9GD | 020 3276 2476 / 01635 490 42 |
| InUtil Communications Ltd | InUtil Communications Ltd | Ty Cornel, 2 Llys Armon Lixwm Holywell CH8 8PG | 0845 121 6672 |
| Inverclyde Telecommunications Ltd | Inverclyde Telecom | 3 Finbraken Drive Gourock Inverclyde PA19 1BF | 01475 632 152 |
| Investroute Ltd | Investroute | The Old Barrel Store Draymans Lane Marlow SL7 2FF | 08453 700 800 |
| Invomo Ltd | Invomo Ltd | Cavallino House Corsley Heath Warminster BA12 7PL | 08700 707070 |
| IP First Ltd | IP First Ltd | St. James Court Wilderspool Causeway Warrington WA4 6PS | 0845 330 0207 |
| IP Infrastructures Ltd | IP Infrastructures Ltd | Denby Dale Road Calder Grove Wakefield WF4 3QZ | 0870 160 3537 |
| IP Integration Ltd | IP Integration Ltd | Attenborough House 15 Bennet Road Reading RG2 0QX | 0118 918 4640 |
| IP Integration Network Services Ltd | IP Intergration Network Services Ltd | Attenborough House 15 Bennet Road Reading RG2 0QX | 0118 918 4600 |
| IP Office Northwest Ltd | IPNW | 48-52 Penny Lane Mossley Hill Liverpool L18 1DG | 0845 009 5544 |
| IP Phone Solutions Ltd | IP Phone Solutions | 77a King Street Knutsford Cheshire WA16 6DX | 0844 2570179 |
| IP Telecommunications LTD | |||
| iPinnacle Ltd | iPinnacle | 60 Southwark Bridge Road London SE1 0AS | 020 7401 4780 |
| Ipitomi Ltd | Ipitomi Ltd | 45 Moorfields London EC2Y 9AE | 020 31594530 |
| IPLYNK Limted | IPLYNK Ltd | Upper Floor 202 Cirencester Business Park Love Lane, Cirencester Gloucestershire GL7 1XD | 0800 434 296 |
| IPV6 Ltd | IPV6 Telecoms | 255 Silk House Park Green Macclesfield Cheshire SK11 7QJ | 0871 237 7577 |
| IPX Telecom Ltd | Amber Telecom | Hallmark House Downham Road Ramsden Heath RM11 1PU | 0808 178 8940 |
| IP-Xchange | IP-Xchange | Unit 7, Manor Court Barnes Wallis Rd Fareham PO15 5TH | 0870 871 4141 |
| ISC Networks Ltd | ISC Networks Ltd | Solar House Stukeley Business Centre Huntingdon Cambridgeshire PE29 6EF | 01480 421000 |
| isdn datacom Ltd | |||
| ISDN Media Ltd | ISDN Media Ltd | 94 Whitehorse Road Windsor Berkshire SL4 4PH | 0870 7775 225 |
| ISDN Media Ltd | KEYLIME Group | 94 Whitehorse Road Windsor Berkshire SL4 4PH | 0870 7775 225 |
| Isis Telecommunications Ltd | Isis Telecommunications | 92-98 Warwick Road London W5 5PT | 0845 456 3515 |
| IT Assist | IT Assist Comm's | The Tek-Centre 187 Baker Street Enfield Middx EN1 3JT | 0870 7771763 |
| Italk Affiliate Telecommunications Ltd | Italk Affiliate Telecommunications Ltd | Unit 6, Gemini Business Centre 136/140 Old Shoreham Road Hove East Sussex BN3 7BD | 0845 373 4290 |
| italk Ltd | Italk | 44 Springfield Road Horsham West Sussex RH12 2PD | 01273 827246 |
| Itec Support Ltd | Itec Support Ltd | 3 Fountain Street Nailsworth Gloucestershire GL6 0BL | 0845 057 0570 |
| IT-Initiative Ltd | IT-initiative Ltd | 5 Dicker Mill Hertford Hertfordshire SG13 7AE | 0844 933 0735 |
| ITLab Direct | ITLab.net | 309 Scott House Gibb Street Birmingham West Midlands B9 4AA | 0121 607 4140 |
| ITR Telecom Ltd | |||
| ITS Telecoms Ltd | ITS Telecom Ltd | Unit 20 Brookside Centre Sumpters Way Southend on Sea Essex SS2 5RR | 08700 420 580 |
| ITSOS | ITSOS | Unit 8 Brannam Crescent Roundswell Business Park Barnstaple N.Devon EX31 3TD | 01271 852970 |
| ITsynergy Ltd | ITsynergy Ltd | PO Box 50283 London EC2P 2WS | 0800 583 9103 |
| ITVET Ltd | Torch Internet (CPS) | 4 London Road Bishops Stortford Herts CM23 5ND | 0870 423 2757 |
| Ivory Billing Ltd | Ivory Billing Ltd | Springsteen House 497 Warrington Road Rainhill Merseyside L35 0LR | 0871 277 6630 |
| IZR Solutions Ltd | IZR Soloutions Ltd | 41 Rushington Business Park Chapel Lane Totton Hampshire SO40 9LA | 02380 427 300 |
| JC Technologies | JC Technologies | C209 MK:TWO Business Centre 1-6 Barton Road Water Eaton Milton Keynes MK2 3HU | 01908 631 075 |
| Jcom UK Ltd | Jcom UK Ltd | 63-67 High Street Teddington Middlesex TW11 8HA | 020 8943 2222 |
| Jet Telecom Ltd | Jet Telecom Ltd | Suite 6 Chineside Heights 5 Earle Road Bournemouth Dorset BH4 8QJ | 08450 700 808 |
| JHL Communications Ltd | JHL Communications | 16 Fitzroy Place Sauchiehall Street Glasgow G3 7RW | 0141 572 1624 |
| JL Data Solutions Ltd | JL Data Solutions Ltd | Unit D12 David Street Bridgend Industrial Estate Bridgend CF31 3SA | 01656 653352 |
| Jomble Ltd | Keypoint Communications | 59 High Street Sittingbourne Kent ME10 4AW | 0845 4210630 |
| JTML.com | JTML.com | Clomar House Jubys Hill Witnesham Ipswich IP6 9EN | 01473 286666 |
| Julton Ltd | Julton | The Bearings Bowbridge Road Newark Nottinghamshire NG24 4BZ | 08700 505013 |
| Jungle Networks Ltd | Jungle Networks Ltd | The Granary 4 Stebbing Farm Fishers Green Stevenage, Hertfordshire SG1 2JB | 07973 164 628 |
| Jupiter Telecom Services Ltd | |||
| Just Utilities Ltd | Just Telecoms | Gibson House Hemswell Cliff Gainsborough, Lincolnshire DN81 8LE | 01427 667 070 |
| JVH Communications Ltd | JVH Communications | Blakedown House Village Farm Estate Bridgend CF33 6BJ | 01656 303030 |
| JVH Voice & Data plc | |||
| KBS Communications | |||
| KCOM Group PLC | Talkmore | Customer Services Kingston Communications (HULL) plc 37 Carr Lane Kingston Upon Hull HU1 3RE | 0800 915 5222 |
| KCT Group | KCT Group Ltd | Cheshire House Market Street Disley Cheshire SK12 2AA | 0844 277 7777 |
| KDDI Europe Ltd | Call127 | Atlas House 1 King Street London EC2V 8AU | 0800 631 3131 |
| Kee Support Ltd | KEE | Broughton Grange Business Centre The Headlands Kettering Northants NN15 6XA | 01536 311640 |
| Kent telephones Ltd | Kent Telephones Ltd | Unit A5 Continental Approach Westwood Ind Estate, Margate Kent CT9 4JG | 01843 232777 |
| Kenton Research Ltd | Easy Access | Innovation House Unit 19 Bourne Ind Park Crayford Kent DA1 4BZ | 01322 552000 |
| Key Account Management Ltd | |||
| Key Telecoms Ltd | Key Telecoms Ltd | PO Box 465 Bury BL8 9BT | 0161 796 3372 |
| Keynote Technologies Ltd | Keynote Technologies Ltd | 271 Regent Street London W1B 2ES | 0845 6522040 |
| Keysystems EC2 Ltd | Lines Ltd | 7 Cuckoo Hill Road Pinner Middlesex HA5 1AS | 020 8866 5698 |
| Keytel Direct Ltd | Keytel Direct Ltd | The Levels Redbrook Lane Rugeley Staffordshire WS15 1RD | 0844 669 3666 |
| Keytel Ltd | Keytel Ltd | The Studios Lea Hall Enterprise Park Rugeley Staffordshire WS15 1LH | 08707 333 111 |
| Keytel Media Ltd | Keytel Media Ltd | The Studios Lea Hall Enterprise Park Rugeley Staffs WS15 1LH | 08707 333 111 |
| Kilbryde Communications Ltd | |||
| Kingdom Telecom Ltd | Kingdom Telecom Ltd | 7 Oaksmead Caterton Oxon OX18 1JX | 01993 846 008 / 07506 405 852 |
| Kiss Telecom Ltd | Kiss Telecom | Suite 3 Wilmslow House Grove Way, off Water Lane Wilmslow, Cheshire SK9 5AG | 0870 750 0300 |
| KLCO Ltd | KLCO Ltd | 23a Ongar Road London SW6 1RL | 0845 880 3939 |
| Known Future Ltd | VoxHub | Harvard House 29 Cornwall Road Harpenden Hertfordshire AL5 4TQ | 020 7100 6370 |
| Koris Ltd | Koris Ltd | 1 Poultry London EC2M 8JR | 0845 094 8484 |
| KT Information Technology Ltd | KT Information Technology Ltd | 228 Merton Road South Wimbledon London SW19 1EQ | 020 8543 9118 |
| KTALK2 Ltd | KTalk2 Ltd | Oakpark Business Centre Alington Road St Neots Cambs PE19 6WA | 07850 706235 |
| Lake Technologies | Lake Technologies | Woodville House Woodville Street St Helens WA10 1ET | 01978 858541 |
| LAKESIDE BUSINESS SERVICES Ltd | Lakeside IT & Telecom | Keepmoat Stadium Stadium Way Doncaster DN4 5JW | 01302 590001 |
| Lancehawk Ltd T/A ETS | ETS | 11a Regent Street East Briton Ferry Neath SA11 2RR | 01639-814800 |
| Lansdowne Telecom Ltd | Lansdowne Telecom Ltd | 3, Bowood Close Derry Hill Calne SN11 9QZ | 0845 241 1166 |
| LANtec Services Ltd | Lantec Services Ltd | Vicotria LC Gedling Street Nottingham NG1 1DB | 0870 7879 989 |
| Lanz Ltd | Lanz Ltd | 37 East Road London N1 6AZ | 020 7251 2000 |
| Lascom Communications | Lascom Communications | Second Floor, One Crown Square Church Street East Woking Surrey GU21 6HR | 0870 890 1156 |
| Last Word Communications | Last Word Communications | Century Place Lamberts Road Tunbridge Wells, Kent TN2 3EH | 0845 070 9007 |
| Lawyers On Line Ltd | Intraspace | Hereford House 3 Offa Street Hereford Herefordshire HR1 2LL | 0870 2247923 |
| Lawyers On Line Ltd | Lawyers Online | Hereford House 3 Offa Street Hereford Herefordshire HR1 2LL | 0870 7778980 |
| LB Telecom & Data Ltd | LB Telecom & Data Ltd | Redfern House Dawson Street Hyde Cheshire SK14 1RD | 0845 296 2261 |
| LCC Communications Ltd | Low Cost Calls | 10A High Street Stokesley, Middlesborough TS9 5DQ | 01642 711 260 |
| Leading Edge Technology Ltd | LET Net | 5 The Atrium 31 Church Road Ashford Middlesex TW15 2UD | 08456 447 949 |
| Leeds Telecom Centre Ltd | Avant (UK) Ltd | 1st Floor Wellington House Sweet Street Leeds, West Yorkshire LS11 9DB | 0870 751 2828 |
| Leisure Link Group Ltd | ITBox | 3 The Maltings Wetmore Road Burton-on-Trent Staffordshire DE14 1SE | 01283 512777 |
| Lekker-Tel | |||
| Lemon Computing Ltd | Lemon Computing | Unit 9 26-28 Priests Bridge London SW14 8TA | 020 8878 2138 |
| Leycom Network Services Ltd | Leycom Network Services Ltd | The Cambrian Complex Ystrad Road Fforestfach Swansea SA5 4HJ | 01792 564 341 |
| Liberty Bell Network Services Ltd | Liberty Bell Network Services | Liberty Courts Chapel Street Dukinfield, Cheshire SK16 4DT | 0161 609 1213 |
| Liberty Bell Voice & Data Ltd | Liberty Bell Voice & Data Ltd | 24 Fielden Court 245 Barlwo Moor Road Chorlton Manchester M21 7AY | 0161 6091234 |
| Liberty Solutions | Liberty Solutions | 11 Pyle Road Swansea SA3 3HH | 0845 077 0794 |
| Liberty-izone Ltd | Liberty-izone Ltd | Rivendell House 10 Church Road Guildford Surrey GU1 4NG | 0870 243 0465 |
| Lifestyle Communication Ltd | Lifestyle Communications | 33 The Hawthorns Outwood Wakefield West Yorkshire WF1 3TL | 07799 348 611 |
| LifestyleIT Ltd | LifeStyleIT Ltd | 106 High Street Harrow on the Hill Middlesex HA1 3LP | 020 8423 2244 |
| Lily Systems Ltd | Lily Systems Ltd | Bedders Lodge Leicester Lane Great Bowden Leicestershire LE16 7HA | 01858 450441 |
| Linco Communications | Linco Communcations | Balmers Farm Plumpton Penrith CA11 9NP | 0870 7775888 |
| Linctel Ltd | |||
| Link Connect Services Ltd | LINK-CONNECT | Moor Park House Moor Park Lane Farnham Surrey GU10 1QP | 08707 433 100 |
| Link Telecom Holdings Ltd | Link Telecom | Airedale Buildings Scott Street Keighley West Yorkshire BD21 2SP | 07870 266612 |
| Lion House (UK) Ltd | Lion House (UK) Ltd | 1 The Granary Court Lodge Horton Road, Horton Kirby Dartford DA4 9BN | 01322 868606 |
| Liquid Telecommunications Ltd | Liquid Telecom | 1 Kingsway London WC2B 6XF | 0845 241 4252 |
| Liquid Telecommunications Ltd | Telecom New Zealand | 1 Kingsway London WC2B 6XF | 0845 241 4252 |
| Liquidite Communications Ltd | Liquidite Communications Ltd | 10 Stonor Henley-On-Thames Oxon RG9 6HE | 0870 085 7224 |
| Lister Communications Ltd | Lister Communications | Brunel Way Stonehouse, Gloucester GL10 3SX | 01453 829 200 |
| LIVEWIRE | Livewire Telecom | 87-89 Chapel Street Salford, Manchester M3 5DF | 0870 750 760 |
| Lixxus Ltd | Lixxus Ltd | 1 Dufferin Street London EC1Y 8NA | 0845 4566313 |
| LLG Solutions Ltd | LLG Solutions Ltd | 21 Kings Avenue Prestatyn Denbighshire LL19 9AA | 01745-886954 |
| Lloyd Network Services Ltd | Lloyd Network Services Ltd | Unit 3 Montgomery Business Park 38 Montgomery Road Belfast BT6 9HL | 028 9040 0400 |
| Lloyds Business Communications Ltd | Lloyds Business Communications Ltd | 109 Mere Grange Leaside Road St Helens WA9 5GG | 0870 232 4500 |
| Lloyds Business Networks Ltd | Lloyds Business Networks Ltd | 861-865 Birchwood Boulevard Birchwood Warrington Cheshire WA3 7QZ | 0870 232 4500 |
| Lloyds TSB Bank plc | Ideal | Customer Care Ideal from Lloyds TSB PO Box 5875 Forres IV36 2YB | 0845 900 9000 |
| Logical Focus Ltd T/A Logical Telecom | |||
| Logicom Systems Ltd | |||
| LogicStar Ltd | Use Your Noodle | 3rd Floor Dean Park House 8010 Dean Park Crescent Bournemouth BH1 1HL | 01202 370 000 |
| loko365 Ltd | ioko | Ioko365 Ltd 1 Innovation Close York Science Park York YO10 5ZD | 01904 438000 |
| London Central Communications Ltd | LCC London Central Communications | 81 Southwark Street London SE1 0HX | 020 7981 0800 |
| London Executive | Home-Saver | 65 York Street London W1H 1PQ | 0870 334 4550 |
| London Facilities Ltd | |||
| Lo-Rate Telecom | Lo-Rate Telecom | Telecom House 158 Marlowes Hemel Hempstead HERTS HP1 1BA | 0870 112 7181 |
| Lowcoms Ltd | Lowcoms | Commerce House Bridgeman Place Bolton BL2 1DW | 01204-396140 |
| LTT PLC | |||
| Lycatel Services Ltd | Residential 18500 | Walbrook Building 195 Marsh Wall London E14 9SG | 0800 652 7566 |
| Lynx Business Solutions Ltd | Lynx Business Solutions Ltd | 8c Chelsfield Road Orpington Kent BR5 4DN | 0871 575 2360 |
| Lyonsdown | Lyonsdown | 10 A Millway London NW7 3RE | 020 8906 9011 |
| M 12 Solutions Ltd | Comm 21 | 6 Manor Court Barnes Wallis Road Fareham Hants | 0845 408 1212 |
| M 12 Solutions Ltd | Island Telecom | 6 Manor Court Barnes Wallis Road Fareham Hants PO15 5TH | 0845 408 1212 |
| M 12 Solutions Ltd | M 12 Solutions | 6 Manor Court Barnes Wallis Road Fareham Hants PO15 5TH | 0845 408 1212 |
| M&M International | M&M International | 10 Burnham Lodge Oaksted Close Ipswich Suffolk IP4 4HJ | 01473 434 909 |
| MA Global Ltd | Desinet | 53 Monument Chase Whitehall Hampshire GU35 9QS | 07884 310 963 |
| MA Global Ltd | MAG | 53 Monument Chase Whitehall Hampshire GU35 9QS | 07884 310 963 |
| MA Global Ltd | Tamilarmobile | 53 Monument Chase Whitehall Hampshire GU35 9QS | 07844 310 963 |
| Mac Systems Ltd | Mac Systesm Ltd | Newlands House 3 Carmunnock Road Glasgow G44 4TZ | 08718 711 992 |
| Macfarlane Telesystems Ltd | NetPlus | 22-26 Albert Embankment London SE1 7TJ | 020 7314 1300 |
| MacLellan IT Ltd | MacLellan | Kathellan House Home Farm Kelty KY4 0JR | 0845 833 1677 |
| MacNeil Training & Developments Ltd | MAC Billing Services | 3 Carmunnock Road Glasgow G44 4TZ | 0871 871 1992 |
| Magicall Ltd | |||
| Magma Business Solutions Ltd | Magma Business Solutions Ltd | 49 Austin Edwards Drive Warwick CV34 5GW | 01926 350035 |
| Magnetic North Software Ltd | Magnetic North OnDemand | Solutions House Meridian East Leicester LE19 1TP | 0870 112 4950 |
| Magrathea Telecommunications Ltd | Magrathea | Albany House 14 Shute End Wokingham Berkshire RG40 1BJ | 0870 068 0068 |
| Mainlink Communications Ltd | Mainlink Communications Ltd | Unit 19, Hedge End Business Centre Botley Road Southampton Hampshire SO30 2AU | 0845 345 3995 |
| Mainstream Digital Ltd | Mainstream Digital Ltd | 201 Cirencester Business Park Love Lane Cirencester Glos GL7 1XD | 01285 644 858 |
| MAIN-TEL (NE) LTD | Main-Tel (N.E) Ltd | Thorntree Farm Bassleton Lane Thornaby Stockton on Tees TS17 0PN | 01642 762202 |
| Maintel Voice & Data Ltd | Maintel Voice and Data Ltd | 61 Webber Street London SE1 0RF | 0870 401 5600 |
| Mallott Installations | Mallot Installations | 28 Milton Avenue Braintree Essex CM7 1AD | 0870 444 1041 |
| Managed Broadband Services | Managed Broadband Services | 1st Floor, Crown House Crown Road Grays Essex RM17 6JH | 0870 251 2599 |
| Managed Business Communications Ltd | MBC | Unit 2 Tennis Court Little Tennis Street Nottingham NG2 4EW | 0871 222 2290 |
| Manchester Metronet Ltd | |||
| Mango Com Ltd | Mango Com Ltd | 1075 Finchley Road London NW11 0PU | 020 3026 1120 |
| Mango Telecommunication Ltd | Mango Telecommunication Ltd | 5 North End Road London NW11 7RJ | 020 8455 1997 |
| Maple Communications | Maple Communications | 73 Northease Drive Hove BN3 8PP | 01273 417 170 |
| Marketing Initiatives | |||
| Marketstats Ltd | Marketstats Ltd | 74 Bentley Road Uttoxeter Staffordshire ST14 7EN | 0870 1284333 |
| Marstons Telecoms Ltd | Marston's | IT and Telecoms Dept Marston's House Brewery Road Wolverhampton WV1 4JT | 01902 711811 |
| Mason Information Technologies Ltd | Mason Information Technologies Ltd | 9 Churchill Park Colwick Nottingham NG4 2HF | 0845 8800 635 |
| Mastercom Telecommunications Ltd | |||
| Matrix Platinum Ltd | |||
| Max Talk Ltd | Max Talk | 2 Hillmans Court Coleraine Co. Londonderry BT52 2DF | 02870 208 003 |
| Max Telecom UK Ltd | Max Telecom UK Ltd | PO Box 608 Stalybridge SK15 2WB | 0161 304 7731 |
| Maxim Eyes Ltd | Maxim Eyes Ltd | 3rd Floor 56-58 High Street Sutton Surrey SM1 1EZ | 0870 753 2160 |
| Maxim Solutions Ltd | Maxim Networks | 36 Bruton Street Mayfair London W1J 6QZ | 020 7016 5180 |
| Maximum Maintenance Uk Ltd | Maximum Maintenance UK Ltd | Holly House Shady Lane Great Barr Birmingham B44 9ER | 0121 3603775 |
| Maximum Networks (UK) Ltd | |||
| Maximus Communications Ltd | FLR Spicer | Unit 4 Orpington Trade Centre Murray Road Orpington Kent BR5 3SS | 0870 997 0000 |
| Maximus Communications Ltd | Maximus Communications Ltd | 4th Floor Berwick House 8-10 Knoll Rise, Orpington Kent BR6 0EL | 08704 445 560 |
| Maxteleco Ltd | Chumi.net | Suite 3 Rays House North Circular Road London NW10 7XP | 020 8965 9999 |
| Maxx Communication Ltd | |||
| Mayflower plc | Mayflower plc | Communications House 61-65 Chapel Street Billericay Essex CM12 9LT | 01277 630 444 |
| MB System Networks Ltd | |||
| MBE Communications | MBE Communications | Midland House 58 Carlton Road Nottingham NG3 2AP | 0115 9599 555 |
| MDS Telecommunications | |||
| Medhurst Communications Ltd | |||
| Media & Communications Ltd | Best4systems.co.uk | Unit 10, Riverside Business Centre Brighton Road Shoreham-by-Sea West Sussex BN43 6RE | 0870 770 1890 |
| Media Centre Network Ltd | The Media Centre | Media Centre Network Ltd 7 Northumberland Street Huddersfield HD1 1RL | 0870 990 5049 |
| Megacall Ltd | Megacall Ltd | The Mamor House 10 St. Margaret's Green Ipswich Suffolk IP4 2BS | 01473 281000 |
| Melbek Telecom | Melbek Telecom Ltd | Bay House 20-22 Market Place Saxmundham Suffolk 1P17 1AG | 0151 326 2240 |
| Melrose Next Ltd | MelroseNeXT | Cambridge House, 67-69 Woodham Lane New Haw Surrey KT15 3ND | 0870 111 8080 |
| Meppen Services Ltd | MSL Telecom | Weetwood Grove Mansion Weetwood Lane Leeds LS16 5PJ | 0113 2300297 |
| Mercury Telecom Ltd | Mercury Telecom Ltd | Unit 6 Trinity Business Park Wakefield West Yorkshire WF2 8EJ | 01924 334550 |
| Mercury UK | Mercury UK | 3 Rosewood Westhoughton Bolton BL5 2RX | 0844 412 8580 |
| Mercury3 Ltd | Mercury3 Ltd | 206 White Lane Sheffield S12 3GL | 0870 4204858 |
| Merula | Merula | 25-31 Huntingdon Street St Neots Cambridgeshire PE1 1BG | 01480 222940 |
| MHA Trading Ltd trading as MHA Telecom | MHA | MHA Trading Ltd, trading as MHA Telecom Building 3, Chiswick Park, Chiswick High Road London W4 5YA | 020 3008 2567 |
| Micron Communications | Micron Communications | Unit 5&6, Bartlett Court Lynx Trading Estate Yeovil Somerset BA20 2NZ | 0870 787 2001 |
| Microtalk UK Ltd | Microtalk | 8 Houslow Road Hanworth Middlesex TW13 6QH | 0800 814 4404 |
| Microtec 99 Ltd | Microtec 99 Ltd | Unit p1/6 Heywood Distribution Park Lancs | 01706 694 000 |
| Midas Telecom Ltd | Midas Telecom | 82-84 York Road Bristol BS3 4AL | 0117 9638249 |
| Midland Communications Company Ltd | Midland Network Services (MNS) | Orchard Works Backfields Upton upon Severn Worcestershire WR8 OJH | 0800 138 3227 |
| Midland Phone Services Plc | MPS plc Voice and Data Networks | Shaw House Wychbury Court Brierley Hill West Midlands DY5 1TA | 01384 47888 |
| Midland TML Ltd | Midland TML | 255 Hospital Street Birmingham B19 2YG | 0121 333 3488 |
| Midlands Finance Ltd | Parrot Telecom | West Midlands House Gipsy Lane Willenhall WV13 2HA | 0871 310 8308 |
| Midnight-online (UK) Ltd | AusTel Communications | Midnight-online (OK) Ltd 16 Greenlands Flackwell Heath Bucks HP10 9PL | 07958 103764 |
| Midshire Business Systems (Communications) Ltd | Legal TX | 95-97 Cato Street Nechells, Birmingham B7 4TS | 0121 359 5559 |
| Midus Communications Ltd | Midus Communications Ltd | Midus House 9 Hummingbird Close Bury St Edmunds Suffolk IP32 7GR | 01284 704 339 |
| Milcomonline Communications Ltd | Milcomonline Communications Ltd | Jupiter House Drummond Road Astonfields Industrial Estate Stafford ST16 3HJ | 01785 244 255 |
| Milenta Ltd | |||
| Millennium Telecom Ltd | Millennium Telecom Ltd | 17 Midland Court Oakham Rutland LE15 6RA | 0870 179 0870 |
| Millfield Management Services Ltd | |||
| MINT network Ltd | MINT Network | 10 Beaumont 6 St. John's Avenue London SW15 2AF | 07810 433 939 |
| MinuteBuyer Corporate Services Ltd | MINUTEBUYER | 64 Lower Mount Street Dublin 2 Ireland | +353+1 661 4697 |
| Minutes Ltd | Minutes Ltd | 2nd Floor 40-46 Dale Street Liverpool L2 5SF | 0870 755 5175 |
| Minutes Telecom | Minutes Telecom | Imperial Court 124 Exchange Street East Liverpool L2 2AB | 0151 421 2600 |
| M-Line Telecoms Ltd | |||
| MLM Messaging Ltd | MLM Messaging Ltd | Studio House, Mount Street New Basford Nottingham NG7 7HX | 0115 9192030 |
| MM Communications Ltd | MM Communications Ltd | Blythe Valley Innovation Centre Central Boulevard Blythe Valley Park Solihull, West Midlands B90 8AJ | 08700 621035 |
| Mobifon Ltd | Mobifon | The Millhouse Station Road Castle Donington Derbyshire DE74 2NJ | 0845 270 2480 |
| Mobifone Ltd | Mobifone Ltd | Bradley Court Off Maple Road Castle Donington Leicestershire DE74 2UT | 0845 2702476 |
| Mobile Account Solutions Ltd | Mobile Account Solution Ltd | Suckling's Yard Church Street Ware Hertfordshire SG12 9EN | 01920 466 466 |
| Mobile Communications 2000 Ltd | Mobile Communications 2000 Ltd | Four Oaks House 160 Lichfield Road Four Oaks Sutton Coldfield B74 2TZ | 0871 288 5158 |
| Mobilshop.com Ltd | Pure Telecom Ltd | Millenium House Fox Covert Lane Misterton Doncaster, South Yorkshire DN10 4ER | 0844 544 9030 |
| Mobotel Ltd | Mobotel Ltd | 91 Peterborough Road Matrix Studio Complex London SW6 3BU | 0870 264 7770 |
| Modern Communications Ltd | Modern Communications Ltd | 26 Grays Inn Road London WC1X 8HR | 0870 444 9891 |
| Modrus Ltd | Modrus Voice | 9 Nimrod Way Wimborne Dorset BH21 7SH | 0845 22 55 016 |
| Modus Telecom Ltd | Modus Telecom | 93-95 Gloucester Place London WIU 6JQ | 0870 871 7871 |
| Mondial Services Ltd | Mondial Services Ltd | Unit 112 94 Londno Road Headington Oxford OX3 9FN | 01865 750 869 |
| Moneypenny | Moneypenny | Elice House Elice Way Wrexham LL13 7YT | 01978 367400 |
| Moorecom Ltd | Moorecom Ltd | The Old Granary 29 Churchgate Street Old Harlow Essex CM17 0JT | 01279 429222 |
| Morgan Brookes Networks | Morgan Brookes Networks | 207 Marsh Wall Docklands London E14 9YT | 020 7001 9999 |
| Morgan Telecom | Morgan Telecom | 254 Dublin Road Kileen Newry BT35 2NL | 0044 77885 86230 |
| Morpheus Computer Technologies Ltd | mint networks | Liss BusinessCentre Station Road Liss Hampshire GU33 7AW | 01730 894 834 |
| MotionTel Ltd | MotionTel Ltd | 27 Redan Place London W2 4SA | 020 7727 0222 |
| Mountain Telecom | |||
| MPC London Ltd | MPC London Ltd | 2 The Drive Rickmansworth Herts WD3 4EB | 01923 779777 |
| MPC London Ltd | Virtual Office | 2 The Drive Rickmansworth Herts WD3 4EB | 01923 779777 |
| MTC Communications | MTC Communications | King Buildings 152 Albertbridge Road Belfast BT5 4GS | 02890 460 440 |
| M-Tech Systems Ltd | M-Tech Systems Ltd | Red Lion House Magham Down Hailsham BN27 1PN | 08450 511155 |
| Multilink Business Communications Ltd | Multilink Business Communications Ltd | 10 Ladysmith Road Enfield, Middlesex EN1 3DT | 020 8350 2120 |
| Mundio Mobile Ltd | UK01 | 8 Station Road Watford Herts WD17 1EG | 0845 305 0600 |
| Murphx Innovative Solutions Ltd | Murphx Innovative Solutions | Eastleigh House Upper Market Street Eastleigh Hants SO50 9FD | 0870 034 9100 |
| MX Digital Ltd | M X Digital | Suite1 Gatwick House Peeks Brook Lane Horley RH6 9ST | 0870 777 2008 |
| MyComms Ltd | MyComms | 2 Primrose Close London N3 2RU | 08709 196 535 |
| Mynd Communications Ltd | Mynd Communications Ltd | 41 Bancroft Avenue LONDON N2 0AR | 0870 0600 610 |
| MyOnlineSpace.Com | MyOnlineSpace.com | Elm Field Toddington Lane Littlehampton West Sussex BN17 6JX | 0845 450 8586 |
| NAC Communications Ltd | NAC Communications Ltd | Suite S6 26 Forth Street Edinburgh EH1 3LH | 0131 550 3742 |
| NAC Networks Ltd | NAC Networks Ltd | 9/10 St Andrews Square Edinburgh EH2 2AF | |
| Namesco Ltd | Namesco Ltd | Acton House Perdiswell Park Worcester WR3 7GD | 0845 3633630 |
| National Comserv | |||
| NationTel Ltd | NationTel Limted | 27 Redan Place London W2 4SA | 020 7727 0222 |
| Nationwide Telephone Assistance Ltd | NTA Ltd | Ivy Lodge Farm 179 Shepherds Hill Harold Wood Romford, Essex RM3 0NR | 01708 320000 |
| NBCN plc | NBCN plc | Unit 8 Scotlands Industrial Estate London Road Coalville LE67 3JJ | 0844 375 5730 / 01332 647716 |
| NCS Group Ltd | NCS Group Ltd | 65 Rodney Street Glasgow G4 9SQ | 0141 353 0000 |
| NDV Solutions Ltd | NDV Solutions Ltd | 27 Old Gloucester Street LONDON WC1N 3XX | 0870 389 0010 |
| Nemesis Networks Ltd | Nemesis Networks Ltd | Switch House Northern Perimeter Road Netherton Liverpool, Merseyside L30 7PT | 0151 5317733 |
| Nene Communications Ltd | Nene Valley Communications Ltd | Unit 8 Orton Enterprise Centre Bakewell Road Orton Southgate Peterborough PE2 6XU | 01733 235 000 |
| Nessco Ltd | Nessco Ltd | Willow House Kestrel View Bellshill ML4 3PB | 01698 741 510 |
| Net Logix Ltd | Net Logix Ltd | 32 Threadneedle Street London EC2R 8AY | 020 7709 9033 |
| Netcall Communications | Charitel | Netcall House 1 Warrior Square Southend Essex SS1 2JN | 01702 615 715 |
| Netcall Communications | Netcall Communications | Netcall House 1 Warrior Square Southend Essex SS1 2JN | 01702 615 715 |
| Netco Networks Ltd | Netco Networks Ltd | 101 High Street Tring Herts HP23 4AB | 01442 381 381 |
| Netcom (Wales) Ltd | Netcall | Unit 27 Enterprise Way Newport Gwent NP20 2AQ | 0844 967 0900 |
| Netcom Technologies Ltd | Netcom Technologies Ltd | 2 Brookfield Yard Sheffield S7 1DW | 0871 2300417 |
| Netcomm UK Ltd | Netcomm UK Ltd | Unit 1 Landown Industrial Estate Gloucester Road Cheltenham GL51 8PL | 01242 539 523 |
| Netkonect Communications Ltd | |||
| Netplan Internet Solutions Ltd | Netplan | The Techno Centre Puma Way Coventry CV1 2TW | 08707 518 345 |
| Netpremacy Ltd | Netpremacy | 100 Wellington Street Leeds LS1 4LT | 0113 237 3072 |
| NetServices Plc | NetServices Plc | 30 Mowden Rd Sandpiper Quay Salford M3 3EZ | 0870 1630 143 |
| Network Billing Services (NBS) Ltd | NBS Network Solutions | Network House 36-38 Thornhill Park Road Southampton SO18 5TQ | 023 8047 5900 |
| Network Business Call Ltd | Network Business Call Ltd | 57 London Road Enfield, Middlesex EN2 6SW | 020 8370 8370 |
| Network Business Call Ltd | Network Voice & Data | 57 London Road Enfield Middlesex EN2 6DU | 020 8370 8370 |
| Network Connect Ltd | Network Connect Network Services | Egret Mill 162 Old Street Ashton Under Lyne Lancashire OL6 7ST | 0161 2142000 |
| Network Europe Group Ltd | NEG | 14 The Capricorn Centre Cranes Farm Road Basildon Essex SS14 3JJ | 08444 771 771 |
| Network I Ltd | Network I | 227 Berwick Avenue Slough Berkshire SL1 4QT | 020 8230 2113 |
| Net-Work Internet Ltd | Net-Work Internet Ltd | Technology House Rhewl Ruthin Denbighishire LL15 1TN | 01824 708 780 |
| Network Partners Ltd | Matrix Communications | Innovation House Millbrook Business Park Mill Lane Rainford WA11 8LZ | 01744 887950 |
| Network Services | Time Solutions | Sarisbury Business Park 33a Painswick Close Sarisbury Southampton SO31 7EQ | 08000 747700 |
| Network Services.com Ltd | NSL Telecom Management | 73 Appletree Walk Watford WD25 0DE | 0845 678 6656 |
| Network Services.com Ltd | Saints Communications | 73 Appletree Walk Watford WD25 0DE | 0845 678 6656 |
| Network Telecom | |||
| Network Telecom (Europe) Ltd | |||
| Net-Work-M Ltd | Net-Work-M Ltd | Saffron House Gaddum Road Altrincham Cheshire WA14 3PD | 0870 444 6564 |
| Networks Direct plc | Networks Direct | P.O. Box 378 Peterborough PE2 6FY | 08708 100 000 |
| Networth Telecom | Networth Telecom | 33 Avenue Duquesne 75007 Paris France | +33 144 117115 |
| New England Telephone Company Ltd | New England Telephone Company Ltd | 101 High Street Tring Herts HP23 4AB | 01442 383 381 |
| New Forest Telecom | New Forest Telecom | 1st Floor, Coronation House Queen Street Lymington Hampshire SO41 9NH | 01590 688 666 |
| New Prospect Business Solutions Ltd | Trusted Telephony | 29 Welbeck Road Maidenhead Berkshire SL6 4EB | 0870 116 7676 |
| New World Network Services Ltd. | New World Network Services Ltd | 177 Hook Road Surbiton Surrey KT6 5AR | 0208 407 5757 |
| New World Telecom (UK) Ltd | |||
| NewNet plc | NewNet plc | Carnac Lodge Cams Hall Estate Fareham PO16 8UJ | 01329 226 722 |
| News Optimus Ltd | News Optimus | Customer Services News Optimus Ltd 14 Flood Walk, Chelsea London SW3 5RG | 0870 901 4294 |
| News Optimus Ltd | Sundial | 14 Flood Walk London SW3 5RG | 0845 3000 175 |
| NewTel Communications Ltd | Newtel | 29 Harley Street London W1G 9QR | 0800 279 3596 |
| NewWave Broadband Ltd | NewWave Broadband | 93 George Street Edindurgh EH2 3ES | 0131 240 1232 |
| Nexcom Communications Ltd | Nexcom Communications Ltd | 5 Cumbrian House 217 Marsh Wall London E14 9FJ | 020 7517 0990 |
| NeXT I.S. Ltd | NeXT I.S. Ltd | Cambridge House 67-69 Woodham Lane New Haw Surrey KT15 3ND | 0870 111 8080 |
| Nextiraone UK Ltd | Nextiraone UK Ltd | Aldershaw Hill Claypit Lane Lichfield WS14 0AQ | 01276 804 074 |
| Nexus Telecommunications plc | |||
| Nexus Unity Ltd | Nexus Unity Ltd | Lower Ground Floor Zicon House Belgrave Street Leeds LS2 8DD | 08701 22 33 23 |
| NGC Network Services Ltd | NGC Network Services Ltd | 1285 Century Way Thorpe Park Leeds LS15 8ZB | 0844 980 0340 |
| NIAD Communications Ltd. | |||
| Nine Telecom Ltd | Nine Telecom | Marlbridge House Enterprise Way Edenbridge Kent TN8 6HF | 0800 970 2999 |
| Nine Telecom Wholesale Ltd | Nine Telecom Wholesale Ltd | Marbridge House Enterprise Way Edenbridge Kent TN8 6HF | 0800 970 2999 |
| NJP Services | Free Calls Direct | 61 London Road Blackwater Camberley GU17 0AB | 0871 424 0185 |
| NM2 Ltd | The Number Exchange | Number Exchange Half Moon House Barrows Lane Heysham LA3 2RP | 0844 4488505 |
| No Bill | |||
| Noble IT Solutions Ltd | Noble IT solutions | Summersong Ashburton Road Bovey Tracey Newton Abbot TQ13 9BZ | 0845 868 5140 |
| Nomis Connections Ltd | Nomis Connections Ltd | 17 The Enterprise Centre Coxbridge Business Park Alton Road Farnham GU10 5EH | 0845 4505065 |
| Noodle Telecom Ltd | TeING | 203 Marsh Wall E14 9YT | 020 8114 1009 |
| Norcom Direct Ltd | Norcom Direct | 3 Charter Gate Moulton Park Northampton NN3 6QF | 01604 679 250 |
| Norisco Ltd | Norisco Telecoms | 60 Tabernacle Street London EC2A 4NB | 020 7324 2200 |
| North East Communications Ltd | North East Communications Ltd | Unit 5 Fairfield Ind Park Bill Quay Gateshead NE10 0UR | 0191 4697945 |
| North London Telecom Services Ltd | |||
| North West Telecom Ltd | North West Telecom | New Brunswick Street Horwich, Bolton BL6 7JB | 0870 872 4130 |
| North West Telecommunications Ltd | |||
| Northamber PLC | |||
| Northern Telecom Ltd | Northern Telecom Ltd | 23 Glencroft Avenue Uddingston Lanarkshire G71 6EF | 01698-305285 |
| Northern Telecommunications Ltd | |||
| Northway Communications Services (UK) Ltd | Northway | Unit 1 Stations Drive Bredon Tewkesbury Gloucestershire GL20 7HH | 01684 878060 |
| Nouveau Solutions Ltd | Nouveau-NET | Technology House 15 Headley Road Woodley Berks RG5 4JB | 0845 055 6066 |
| Nova Communications Ltd | Novacomms | Bridge Street Derby DE1 3LA | 0845 413 0128 |
| Novarise Associates Ltd | NOVACOM | 2 China Street Fenton Stoke on Trent ST4 3NJ | 01782 450311 |
| Novatech Ltd | Novatech Ltd | Harbour House Hamilton Road Cosham Hampshire PO6 4PU | 023 9232 2762 |
| NT Independent Networks Ltd | NT Independent Networks Ltd | The Business Park Technology Drive Beeston, Nottingham NG9 2ND | 01159 517 000 |
| NT Telecom Ltd | NT Telecom | 15 Titan Way Britannia Enterprise Park Lichfield Staffordshire WS14 9TT | 01543 305050 |
| NTE Ltd | NTE Ltd | 1 Faraday Road Northeast Industrial Estate Peterlee County Durham SR8 5AP | 0191 518-8008 |
| NTTCable UK Ltd | NTTCable UK | Cilpost Farm Cwmfelin Boeth Whitland Carns SA34 0RP | 01944 241315 |
| Number Portability Company Ltd (NPC) | |||
| Numeric Futures Ltd | Numeric Futures Ltd | 170 Holliday Street Birmingham B1 1TJ | |
| NWP Spectrum Ltd | Spectrum Interactive | PO Box Hemel Hempstead Herts HP2 4WA | 01442 205 500 |
| O2 (UK) Ltd | O2 | 260 Bath Road Slough Berkshire SL1 4DX | 01753 628835 |
| Oak Telecom Ltd | Oak Telecom | 7 Albany Park Cabot Lane Poole Dorset BH17 7BX | 01202 607 000 |
| Oakstream Communications Ltd | |||
| Oasis Communication Services Ltd | Get Connected | 27 Nevill Street Abergavenny NP7 5AA | 029 2061 5588 |
| Oasis One Ltd | Oasis One | Oak House Groes Lwyd Abergele Conwy LL22 7SU | 01745 828428 |
| O-Bit Telecom Ltd | O-bit | 2 Fagnall Lane Winchmore Hill Bucks HP7 0PG | 0870 7870 223 |
| O-Bit Telecom Ltd | Teletalk | 2, Fragnall Farm Barns Fragnall Lane Winchmore Hill Bucks HP7 0PG | 0870 787 0223 |
| O-Bit Telecom Ltd | Teletalk | 2 Fagnall Farm Barns Fagnall Lane Winchmore Hill Bucks HP7 0PG | 0870 787 0223 |
| O-Bit Telecom Ltd | World Telecom Global Calling Card | 2, Fragnall Farm Barns Fragnall Lane Winchmore Hill Bucks HP7 0PG | 0870 787 0223 |
| O-Bit Telecom Ltd | World Telecom Global Calling Card | 2, Fagnall Farm Barns Fagnall Lane Winchmore Hill Bucks HP7 0PG | 0870 787 0223 |
| Ocean Data & Voice Services Ltd | Ocean Data and Voice Services Ltd. | 2 Ocean Quay Marina Belvidere Road Southampton SO14 5QY | 0845 050 5656 |
| Ocean Voice and Data Ltd | Ocean Voice and Data Ltd | 6 The Matlings Hoe Lane Ware Hertforshire SG12 9LR | 0870 2202768 |
| Oceanlight Communications Ltd | |||
| OCIS LITE | O.C.I.S. Lite | Communications House 95 Boston Road Leicester LE4 1AW | 0870 165 0005 |
| OciusB2 Ltd | OciusB2 Ltd | The Heath Runcorn Cheshire WA7 4QF | 08707 578700 |
| Octagon Communications Ltd | Octagon Communications Ltd | Octagon House 2 Astley Court Lockett Road Ashton-in-Makerfield WN4 8DE | 08456 787878 |
| Odyssey Systems Ltd | |||
| OERS Ltd | Gatley Communications | 32 Birchdale Avenue Heald Green Cheadle Stockport SK8 3ST | 0161 436 0625 |
| Office Communications (Wales) Ltd | Office Communications (Wales) Ltd | Unit 22, Brynmenyn Business Centre St Theodores Way Brynmenyn Ind Est Bridgend CF32 9TZ | 08444 990010 |
| OHS Technology Ltd | NGR Technology Group | St George's Tower Hatley St George Sandy Beds SG19 3SH | 08702 430 861 |
| Olive Fixed Line Services Ltd | Olive Fixed Line Services | 1st Floor, Tal House 575 North End Road Wembley Middx HA9 0UU | 0870 444 1083 |
| Omega Telecom Ltd | Omega Telecom Ltd | 111 Victoria Road East Thronton - Cleveleys Lancs FY5 5HQ | 0870 046 0050 |
| Omnitech Integrations Ltd | |||
| On Air Telecom Ltd | On Air Telecom Ltd | Westpoint 501 Chester Road Manchester M16 9HU | 0161 9060845 |
| On Line Systems (Northern) Ltd | |||
| On-Communications Ltd | On-Communications Ltd | The Quadrant 99 Parkway Avenue Sheffield S9 4WG | 08704 296745 |
| One 4 Telecom | One 4 Telecom | 11 Grosmount Way Coedkernew Newport NP10 8UQ | 01633 816080 |
| One Comm Ltd | One Comm | Suite 3, 2nd Floor Orbit House Albert St Eccles M30 0BL | 0870 232 2099 |
| One Point Telecom | One Point Telecom | One Point Telecom 9 Sundial Court Tolworth Rise Tolworth, Surrey KT5 5RN | 08704 424 343 |
| One Source Communications Ltd | One Source Communications Ltd | 16 Commerce Road Peterborough PE2 6LR | 0845 127 1421 |
| One World Telephony Ltd | Intellicoms | B;lcoks D& G, The Heath Business and Technical Park Runcorn Cheshire WA7 4QF | 0845 072 0094 |
| One2One Telecoms Ltd | One 2 One Telecoms | Unit R2 Innsworth Technology Park Innsworth Lane Gloucester GL3 1DL | 0844 2091599 |
| OneBill Telecom | OneBill Telecom | Premium House The Esplanade Worthing, West Sussex BN11 2BJ | 01903 836 700 |
| Onega Ltd | Onega | Studio H, Container City 2 Trinity Buoy Wharf Orchard Place, Docklands London E14 0JY | 0870 060 1310 |
| Onestop ITS Ltd | Onestop IT Solutions | 32/6 Hardengreen Industial Estate Dalhousie Road Eskbank Midlothian EH22 3NX | 0131 510 0100 |
| Onetalk Ltd | Onetalk Telecom | Globe House Colwick House Nottingham Nottinghamshire NG2 4GB | 01159 478 910 |
| Onetel Business Communications Solutions Ltd | Ontel Business Communications Solutions Ltd | 3 Tenterton Street Mayfair London W1S 1RR | 0870 199 3164 |
| Onsite Connect Ltd | Onsite Connect | 40-44 Arundel Street Portsmouth PO1 1RT | 0845 077 7071 |
| Oosha Ltd | Oosha Ltd | Suite 2 The Chubb Buildings Fryer Street Wolverhampton WV1 1HT | 01902 702233 |
| Opal Telecom Ltd | Opal Telecom | Stanford House Garret Field Birchwood Warrington, Cheshire WA3 7BH | 0845 330 3456 |
| Opal Telecom Ltd | Opal Telecom Indirect | Northbank Irlam Manchester M44 5BL | 0845 330 6725 |
| Open IP Ltd | Open IP Ltd | CPA House 49 Bolton Road Famworth Bolton BL4 7JN | 0845 868 7263 |
| Open-Link Technology Ltd | Open-Link | Open-Link Technology Ltd Archway House Padworth Near Reading RG7 5HR | 08700 500 771 |
| Opex Hosting Ltd | Opex Hosting | Operations Service Centre 462 London Road Isleworth Middlesex TW7 4ED | 020 8326 8200 |
| Optimal Communications Services Ltd | Optimal Communications Services Ltd | 49 Station Road Gerrards Cross Buckinghamshire SL9 8ES | 01753 482946 |
| Optimity Ltd | |||
| Optimum Calls Ltd | Optimum Calls Ltd | 164 Kensington High Street Kensington London W8 7RG | 0844 3723410 |
| Option Telecom Plc | Option Telecom Plc | Elstree Business Centre Elstree Way Borehamwood Hertfordshire WD6 1RX | 0208 238 7873 |
| Opus Network Services Ltd | |||
| Opus Telecom Ltd | Opus Telecom (Berkshire) Ltd | No 30 Tamworth Bracknell Berkshire RG12 0TU | 0845 0742932 (Tony Bassett) |
| Opus Telecom Ltd | Opus Telecom (Bucks) Ltd | 6 Eskdale Lodge Lexham Gardens Amersham HP6 5JJ | 01494 727930 |
| Opus Telecom Ltd | Opus Telecom (Central London) Ltd | 7 Margherita Place Waltham Abbey Essex EN9 3TT | 0845 0742990 (Sanjay Gurewan) |
| Opus Telecom Ltd | Opus Telecom (Derbyshire) Ltd | 15 Montpelier Ambergate Belper DE56 2GU | 0845 0705850 |
| Opus Telecom Ltd | Opus Telecom (Dorset) Ltd | 10 Hornbeam Way Wimbourne Dorset BH21 2QE | 0845 676 0711 (Shaun Steger Lewis) |
| Opus Telecom Ltd | Opus Telecom (Leicestershire) Ltd | 31 Robinia Close Lutterworth Leicestershire LE17 4FS | 0845 074 2993 (Bharat Rathod) |
| Opus Telecom Ltd | Opus Telecom (Oxfordshire) Ltd | 7 Oaksmead Caterton Oxforshire OX18 1JX | 0845 257 5490 (Mark Stanton) |
| Opus Telecom Ltd | Opus Telecom Ltd | Alresford House Mill Lane Alton Hants GU34 2QJ | 01420 567 600 |
| Orange | Orange | St James Court Great Park Road Almondsbury Park Bradley Stoke Bristol BS32 4QJ | 07973 202 039 |
| Orange Home UK Plc | Orange Broadband | Orange Customer Care PO Box 486 Rotherham S63 5ZX | 08700 102 462 |
| Orb Communications Ltd | |||
| Orbex Solutions Ltd | Orbex Solutions Ltd | Accurist House 44 Baker Street London W1U 7AL | 0870 0411 411 |
| Orbtalk Ltd | Orbtalk | Unit 4 Hove Technology Centre Hove BN3 7ES | 0845 868 8557 |
| Origin Telecom Ltd | Origin Telecom | 19 Hereward Rise Halesowen B62 8AN | 0044 870 199 3164 |
| Ortiga Ltd | Ortiga Ltd | Vienna House Birmingham International Park Bickenhill Lane Solihull B37 7GN | 0845 055 6545 |
| Otra Dia Ltd | Otra Dia | 2nd Floor 145-157 St John Street London EC1V 4PY | 0800 0336 444 |
| Outburst Ltd | |||
| Outburst Services Ltd | VoIP-Express Broadband | PO Box 25 Winchester SO21 2BH | 0800 804 8310 |
| Outsourcevoice Ltd | Outsourcevoice | Eagle Tower Montpellier Drive Cheltenham Gloucestershire GL50 1TA | 01242 244843 |
| Overline Network Consultants | Overline Network Consultants | Unit 8, The Quoin Estate Marlborough Road, Lancing Business Park Lancing West Sussex BN15 8AD | 0870 891 9001 |
| Ovious Solution Ltd | Ovious Solution | 9 Cork Street London W1S 3LL | 0800 063 3100 |
| Oxygen8 Communications UK Ltd | Opera Telecom | 19 Cato Street Birmingham B7 4TS | 0808 131 3131 |
| P S Hanford Ltd | P S Hanford Ltd | Eagle Tower Montpellier Drive Cheltenham Gloucestershire GL50 1TA | 01242 516759 |
| p2p Communications Ltd | p2p Communications Ltd | Ashlea House 323 North Road Manchester M11 4NY | 0870 755 1171 |
| Pace Telecom Ltd | Pace Telecom Ltd | Unit 2, Zenith House Gresford Industrial Park Wrexham LL12 8LX | |
| Packet Media Ltd | Packet Media Ltd | Enterprise House Trentham Business Quarter Trentham Lakes South Stoke on Trent ST4 8GB | 01782 463838 |
| Pan Telecom | Pan Telecom Ltd | Communicate House Allenby Business Village Crofton Road Lincoln LN3 4NL | 0870 757 7001 |
| Panther Telecom Ltd | Panther Telecom Ltd | Winston House 2 Dollis Park London N3 1HF | 08456 777 666 |
| Panztel (UK) Ltd | Panztel (UK) Ltd | Raglan House Llantarnam Business Park Cwmbran NP44 3AB | 0845 453 4150 |
| Paramount Telematics Ltd | Paramount Telematics T/A Fleetcall | The Old Post Office 28 - 29 Haigh Road Aspull Wigan WN2 1YA | 0870 766 8867 |
| Parrish Communications Ltd | Parrish Communications | 37-39 Eastcheap LONDON | 020 7648 0770 |
| Part Two Ltd | Touch Communications | M.I.O.C Styal Road Manchester M22 5WB | 0845 673 0025 |
| PAS Partnership Ltd | PAS Partnership Ltd | Unit 11 LDTC Bancroft Rd Burnley Lancashire BB10 2TP | 01282 872361 |
| PC Store Ltd | PC Store Ltd | PO Box 6568 Newark NG23 7ER | 01522 704777 |
| Peach Telecom Ltd | Peach Telecom Ltd | Unit 17 Hedge End Business Park Botley Road Hedge End Southampton SO30 2AU | 0845 688 8776 |
| Peakweb Ltd | Peakweb | 15 Dale Close Fritchley Belper Derbyshire DE56 2HZ | 01773 856872 |
| Pearl Telecom Ltd | Pearl Telecom | Barnett House 53 Fountain Street Manchester M2 2AN | 0845 456 6543 |
| Pegasus Communications (uk) Ltd | Pegasus Communications (uk) Ltd | 206 White Lane Sheffield S12 3GL | 0870 4441408 |
| Pennine Telecom Ltd | Pennine Telecom | Pennine House Salford Street Bury Lancashire BL9 6YA | 0161 763 3333 |
| Pentagon Systems | Pentagon Systems | Darley Court 1 Alfreton Road Derby DE21 4AA | 08451 662358 |
| Pentel Communications Ltd | Pentel Communications Ltd | Camellia House Water Lane Wilmslow Cheshire SK9 5BB | 0845 230 0011 |
| Performance Telecom Ltd | Performance Telecom Ltd | Unit 63 17 Holywell Hill St Albans AL1 1DT | 0845 456 1500 |
| Peterborough Telecoms Ltd | Peterborough Telecoms Ltd | 12 Mary Walsham Close Stanground Peterborough PE2 8RT | 01733 890074 |
| PGL Com Ltd | PGL Com | Unit A, ARC Progress Beckering Park Lidlington Beds MK43 0RD | 08445 449 330 |
| PGL IT Ltd | PGL | Unit A, ARC Progress Beckerings Park Lidlington Beds MK43 0RD | 08445 449330 |
| Pheonix Corporate Communications Ltd | |||
| Phitel Communications | Phitel Communications | 42 Glebe Road Hertford Herts SG14 3JY | 01992 550498 |
| Phoenix Call Ltd | MJM Billing | 96 The London Fruit & Wool Exchange Brushfield Street London E1 6EP | 0870 855 4344 |
| Phoenix Call Ltd | Phoenix Call | 96 The London Fruit & Wool Exchange Brushfield Street London E1 6EP | 0845 052 3344 |
| Phoenix Link | Damski Ltd T/A Phoenix Link | Albion Chambers 1 Albion Road Birchington Kent CT7 9DN | 01843 844 180 |
| Phone Buddy Ltd | |||
| Phone Direct | |||
| Phonebox Communications Ltd | |||
| Phones 4 Business Ltd | Phones 4 Business Ltd | Suite 5, Cleveland Court 3-5 Cleveland Road Bournemounth Dorset BH1 4QB | 01202 705 030 |
| PiaTel Communications Ltd | PiaTel | 302 Regent Street London W1B 3HH | 020 7979 1700 |
| Pineapple Communications Ltd | Pineapple CPS | Top Floor Edwards Corner Regents Street Hinkley, Leicester LE10 0BB | 01455 616 010 |
| Pink Connect Ltd | Pink Connect Ltd | 2 West Street Chipping Norton Oxfordshire OX7 5AA | 0845 450 9393 |
| Pinnacle Telecommunications Plc | |||
| Pinnacle Telecoms Wales | |||
| Pipemedia Ltd | Pipecall | Pipemedia House Units 1-2 Warren Park Way, Enderby Leicestershire LE19 4SA | 0871 4251111 |
| Pipex Internet Ltd | Freedom2Surf | 1 Triangle Business Park Stoke Mandeville Buckinghamshire HP22 5BL | 08701 608 600 |
| Pipex Internet Ltd | Nildram | 1 Triangle Business Park Stoke Mandeville Buckinghamshire HP22 5BL | 08701 608 600 |
| Pipex Internet Ltd | Pipex | Fred Hills The Hinshelwood Building Edmund Halley Road Oxford OX4 4GB | 01865 381 564 |
| Plain Sailing Communications Ltd | Plain Sailing Communications Ltd | PO Box 335 Sevenoaks KENT TN13 3ZX | 01732 743 746 |
| Planet Numbers Ltd | Planet Numbers Ltd | 3rd Floor, Bristol & West House Post Office Road Bournemouth BH1 1BL | 08450 666 666 |
| Planet Telecommunications Solutions Ltd | |||
| Platinum Telecom | Platinum Telecom Customer Services | 145-157 St John Street LONDON EC1V 4PY | 0870 167 2114 |
| Plaza Telecom Ltd | Norbridge Telecom Ltd | Barrack House Barrack Square Chelmsford, Essex CM2 0UU | 0870 255 5555 |
| Plum Communications Ltd | Plum Communications | Bright Street Oldham OL8 4AB | 0870 750 4730 |
| PlusNet PLC | Force 9 | Technolgoy Buildings Terry Street Sheffield South Yorkshire S9 2BU | 0114 220 0072 |
| PlusNet PLC | Free Online | Technology Buildings Terry Street Sheffield South Yorkshire S9 2BU | 0114 220 0072 |
| PlusNet PLC | Plus Net | Technology Buildings Terry Street Sheffield South Yorkshire S9 2BU | 0114 220 0072 |
| Pneuma Global Networks | Pneuma Global Networks | Brookmans Park Teleport Gt North Road Brookmans Park Herts AL9 6NE | 01707 648316 |
| Poidon Ltd | Poidon Ltd | Raymac House 152-158 Park View Road Welling Kent DA16 1SR | 020 8303 8668 |
| Pointel Communications Ltd | Pointel Communications Ltd | 42 Bloomsbury Street London WC1B 3QJ | 020 7299 4299 |
| Polaris Telecommunications Ltd | Polaris Telecoms | St John's Innovation Centre Cowley Road Cambridge CB4 0WS | 08707 651654 |
| Pond Group Ltd | Pond Group | 17 Widmore Road Bromley BR1 1RL | 020 8466 6043 |
| Poplar Ltd | |||
| Portal Voice & Data Ltd | Portal Voice & Data Ltd | Unit 2a, Saphire Estate Roundtree Way Norwich Norfolk NR7 8SQ | 01603 785300 |
| Positive ICT Ltd | Positive ICT | PO Box 3866 Wolverhampton West Midlands WV6 8ZT | 0870 873 4610 |
| Post Office Ltd | Post Office HomePhone | 80 Old Street London EC1V 9NN | 020 7320 7242 |
| Post Office Ltd | Post Office® HomePhone | P.O. Box 250 Brighton BN1 32L | 0800 092 0511 |
| Power Internet Ltd | PoweNet | 249 Midsummer Boulevard Milton Keynes MK9 1EA | 01908 605 188 |
| Powerdial Services Ltd | Powerdial | East Batterlaw Farm Hawthorn County Durham SR7 8RP | 01915275000 |
| Powertel Communications Ltd | |||
| Preferred One Stop Technologies Ltd | Preferred One Stop Technologies Ltd | Priority House Grove Park Court Harrogate HG1 4DP | 01423 534 560 |
| Premier Choice Telecom Ltd | |||
| Premier Mobile Phones Ltd | |||
| Premier Talk Ltd | Premier Talk Ltd | 19 Boxgrove Priory Riverfield Bedford MK41 0TQ | 0871 425 0524 |
| Premier Telecommunications Ltd | Premier Telecommunications | The Old Chapel Main Street Branston Burton-on-Trent DE14 3EY | 01293 568301 |
| Premier Voice & Data Ltd | |||
| Primus Telecommunications | Primus Telecommunications Ltd | Athenaeum Building 2nd Floor South 8 Nelson Mandela Place Glasgow G2 1BT | 0800 036 3839 |
| Principal IT Ltd | Principal IT Ltd | The Red House 119 Fore Street Hertford Herts SG14 1AX | 08704 103 232 |
| Proactive Networks Ltd | Proactive Networks Ltd | Suite 16, Floor 6 St James House Penedelton Way M6 5FW | 0870 224 2890 |
| Procom Europe Ltd | |||
| Pro-eco | Pro-Purchasing | Newspaper House Tannery Lane Warrington WA5 2UD | 01925 416784 |
| Progressive Communications Ltd | Progressive Communications Ltd | 25 Groves Business Centre Shipton Road Milton-under-Wychwood OXON OX7 6JP | 01993 831 222 |
| Progressive Consulting Ltd (PCL) | Progressive Consulting Ltd (PCL) | 46 Hyde Road South Croydon Surrey CR2 9NP | 020 8657 4666 |
| Property Hunt Ltd T/A 21c | 21c Voice and Data | 6 Ellsmere Court Manners Industrial Estate Ilkeston Derbyshire DE7 8EF | 0845 223 2200 |
| Protel UK Ltd | Protel UK Ltd | 44-48 Paul Street London EC2A 4BL | 020 7965 5000 |
| Pro-Voice Ltd | Pro-Voice Ltd | Unit 6, Solent Industrial Estate Southampton Hampshire SO30 2FX | 0870 803 0836 |
| Pro-Voice Network Ltd | Pro-Voice Network Ltd | Unit 8, Solent Industrial Estate Hedge End Southampton Hampshire SO30 2FX | 0870 8030836 |
| Proweb (UK) Ltd | Proweb (UK) Ltd | 18 Mansfield Road Daybrook Nottingham NG5 6AA | 0115 920 2010 |
| PRS TELECOM LTD | 247telecoms | 16a Middleton Gardens Middleton Manchester M24 4DF | 0845 8694320 |
| PRS TELECOM LTD | PRS TELECOM LTD | 16a Middleton Gardens Middleton Manchester M24 4DF | 0161 6534141 |
| PSIFX Networks Ltd | PSIFX Networks | 3 Somerset Mews Loch Street Runcorn Cheshire WA7 1LP | 01928 574026 |
| PSU Talk Ltd | PSU Talk Ltd | 3 Manchester Park Tewkesbury Road Cheltenham, Gloucester GL51 9EJ | 0870 112 1128 |
| Public Internet Ltd | Public Internet | Unit 6, Boundary Park Wheatley Road Garsington Oxfordshire OX44 9EJ | 01856 594 000 |
| Pulse Business Solutions Ltd | |||
| Pulse Media (UK) Ltd | Pulse Media | Media House The Lansbury Estate Knaphill Woking, Surrey GU21 2EP | 0870 750 4002 |
| Pure Comms Bristol Ltd | Pure Comms | 41 Southfield Road Nailsea North Somerset BS48 1JB | 0800 6344733 |
| Pure Communications UK Ltd | |||
| Pure Talk Ltd | Pure Talk Ltd | The Bridges Centre Birches Head Road Stoke-on-Trent ST2 8DD | 0870 3307431 |
| Pure Telecom Ltd | Pure Telecom Ltd | Aspen Court Comelscourt Dublin 19 Ireland | +353 1 2895555 |
| Pure Wire Ltd | Pure VOIP | Solutions House Blisworth Hill Farm Northampton NN7 3DB | 0870 192 2000 |
| Pureglow Ltd | |||
| Pure-IP Ltd | PURE IP Ltd | The Granary 113 Lavender Walk London SW11 1JS | 020 7801 3280 |
| purple comms ltd | |||
| Q Communications | Q Communications | 109 Park Avenue Mitcham Surrey CR4 2ES | 0800 090 1212 |
| Q\DOS Networks Ltd | Q\DOS Network Services Ltd | Manor Farm Business Centre Manor Lane Stutton Ipswich IP9 2TB | |
| QiComm Ltd | FONE2 | QiComm Ltd 2nd Floor, Challenger House 42 Adler Street London E1 1EE | |
| Qnet Group Ltd | Qnet Networks Ltd | Qnet House Malleable Way Stockton On Tees Cleveland TS18 2QX | 08708 503 027 |
| Quadium Ltd | Quadium Ltd | The Sussex Innovation Centre University of Sussex Science Park Square East Sussex BN1 9SB | 0845 330 3331 |
| Qualicom Solutions | Qualicom Solutions | 82 Greenbank Road Watford Hertfordshire WD17 4FL | 01923 229166 |
| Qualitel Business Telecoms Specialists | Qualitel Business Telecoms Specialists | Brampton House 10 Queen Street Newcastle Staffs ST5 1ED | 01782 622288 |
| Qualitel International Ltd | Qualitel International Ltd | Carrick Business Centre Commercial Road Penryn, Cornwall TR10 8AR | 01326 378 999 |
| Qubic Ltd | Qubic Ltd | Priory House Marsh Road Alperton Lane Wembley, Middlesex HA0 1ES | 020 8601 7000 |
| Quest Comms Services Ltd | QuestComms | 21 Ilex Court Emscote Road Warwick CV34 4PJ | 01926 776 909 |
| Quest Communications Ltd | Quest Communications | 2 Tanners Courtyard West Street Warwick CV34 6AZ | 01926 490807 |
| QuestZones (Europe) Ltd | QuestZones (Europe) Ltd | The Digital Depot Roe Lane The Digital Hub Dublin 8 | +353 1 488 5863 |
| QuintPlay Ltd | QuintPlay | One Friar Street Reading Berkshire RG1 1DA | 01189 758 547 |
| Quore Ltd | Quore Ltd | 80 Lind Road Sutton Surrey SM1 4PL | 0845 6448490 |
| QX Telecom Ltd | QX Telecom Ltd | 2 Glenmore Close Thatcham RG19 3XR | 0844 574 3333 |
| R G C Telecommunications Ltd | R G C Telecommunications | Haughmond Farm Felton Butler Shrewsbury Shropshire SY4 1AS | 07143 741188 |
| Radiant Technological Services Ltd | Radiant Technological Services Ltd | 13 Manor Road East Leake Loughborough LE12 6QW | 01509 853 853 |
| Rainbow Global Network Ltd | Rainbow Global Network Ltd | Hawley Manor Hawley Road Dartford Kent DA1 1PX | 0870 873 7575 |
| Rainbow Telecom | Rainbow Telecom | Dundonald Business Park Dundonald, Belfast BT16 1QT | 0871 230 4200 |
| Rainton. Net Ltd | Rainton.Net Ltd | The Evolve Centre Cygnet Way Rainton Bridge South Durham DH4 5QY | 0191 305 5005 |
| Rapid Communications Ltd | The Independent Choice | 43 Temple Row Birmingham B2 5LS | 08702 430 980 |
| Rapier Integrated Solutions Ltd | Rapier Teamcall | Craven House The Lansbury Estate, Lower Guildford Road Knaphill Surrey GU21 2EP | 0870 89 870 89 |
| Raw Telecom Ltd | Raw Communications | Hangar 3 Fourth Avenue Doncaster DN9 3GE | 0845 121 0206 |
| Raw Telecom Ltd | Raw Telecom Ltd | Hangar 3 Fourth Avenue Doncaster DN9 3GE | 0845 121 0206 |
| Raw Telecom Ltd | RawCom | Hangar 3 Fourth Avenue Doncaster DN9 3GE | 0845 121 0206 |
| RCG Global Networks Ltd | |||
| RDL Associates | RDL Associates | 12 Chapel Street Dunfermline KY12 7AW | 0845 644 2001 |
| RDT (Southern) Ltd | RDT (Southern) Ltd | Unit 2 Zenith House Gresford Industrial Park Wrexham LL12 8LX | 01978 858 585 |
| RE Marketing Services Ltd | |||
| React | React Communication Solutions Ltd | 20 The Metro Toutley Road Wokingham RG41 1QW | 0800 0191316 |
| Ready Technology Ltd | Ready Technologies Ltd | 77 Oxford Street London W1D 2ES | 0207 135 7000 |
| Reality Telecom plc | Call Navigator | Vickers House Priestley Road Basingstoke RG24 9NP | 08707 606 606 |
| Realta UK Ltd | Realta UK Ltd | Priestgate House 3-7 Priestgate Peterborough PE1 1JN | 0870 220 7220 |
| Red Communications | Redx Communications | Highstone House 165 High Street BARNET EN5 5SU | 020 8440 0007 |
| Red Matter Ltd | Red Matter Ltd | 42a Station Road East Oxted Surrey RH8 0TG | 020 7138 2939 |
| Redcoms Ltd | Redcoms | Telecom House Western Avenue Bridgend Ind. Estate Bridgend CF31 3RT | 01656 674000 |
| Redheath Services Ltd | Redheath Services Ltd | Unit D Kapital Building Charter Street Leicester LE1 3UD | 0871 315 7303 |
| Redstar Telecom Ltd | |||
| Redstone Communications Ltd | Redstone Communications | 80 Great Eastern Street London EC2A 3RS | 0845 200 2200 |
| Redwood Telecommunications Ltd | Redwood Connect | Trade Tower Plantation Wharf London SW11 3UF | 020 7738 1000 |
| Reefstream Ltd | Reefstream Telecom | Durham Tees Valley Business Centre Orde Wingate Way Stockton on Tees TS19 0GA | 01642 636275 |
| Reeves Lund & Co Ltd | Reeves Lund & Co Ltd | The Courtyard 55 Charterhouse Street London EC1M 6HA | 020 7739 8888 |
| Regent Communications Ltd | Regent Comms | 21 llex Court Emscote Road Warwick CV34 4PJ | 01926 776909 |
| Relevance Ltd | Relevance Ltd | 56 Station Road Waddington London LN5 9QW | 08700 501101 |
| Reliance IP Networks Ltd | Reliance Networks | Big Storage Fence Avenue Macclesfield SK10 1LW | 0845 070 4607 |
| Rely Telecom | |||
| REMEDi Communicating Solutions Ltd | REMEDi Communicating Solutions Ltd | Didlington Wimbourne Dorset BH21 7HH | 0330 0883 766 |
| Resel Communications Ltd | Resel Communications Ltd | Tesla Court 8 Innovation Way Peterboroguh Business Park Cambridgeshire PE2 6FL | 0845 676 2020 |
| Resource Network Solutions Ltd | Resource Network Solutions Ltd | Unit 1 Nasmyth Building Nasmyth Avenue Scottish Enterprise Technology Park East Kilbride G75 0QR | 01355 575111 |
| Resource Utilities Ltd | |||
| Retail Technology Services Ltd | RTS Convergent Services (RTSCS) | Brooke House 4 The Lakes Northampton NN4 7YD | 0844 840 7666 |
| Revolution Telecoms Ltd | Revolution Telecoms Ltd | 8 Arundel Close Hemel Hempstead Herts HP2 4QR | 01442 214 028 |
| Reward Telecoms Ltd | Reward Telecoms | P.O.Box 87 Wesley House Wakefield West Yorkshire WF2 6YS | 08700 603 400 |
| RFN Marketing Ltd | |||
| RGS Communication UK Ltd | RGS Telecom LTD | 8U Meadow Works Great North Road Barnet London EN5 1AU | 020 76244322 |
| RGT Ltd | RGT Ltd | Northdown House Chapel Road Smallfield RH6 9NW | 0870 777 2444 |
| RHM Telecommunications Ltd | RHM Telecommunications Ltd | Goodridge House Goodridge Avenue Gloucester GL2 5EA | 01452 511 325 |
| Ridgeway Phones Ltd | Ridgeway Telecom | The Orangery East Lockinge Wantage Oxon OX12 8QJ | 01235 820 800 |
| Ring2 Communications Ltd | Ring2 Conferencing | 12 Tokenhouse Yard London EC2R 7AS | 0845 0800 877 |
| Ripple Communications Ltd | |||
| Ripwire Ltd | Ripwire Ltd | Fusion@Magna Magna Way Rotherham S60 1FE | 0114 303 0096 |
| Risc Group IT Solutions Ltd | Risc Group UK | Church Walks Business Centre Church Walks Llandudno Conwy LL30 2HL | 01492 862780 |
| Riverdale Voice & Data | Riverdale Voice & Data | 266 Toddington Road Luton LU4 9DZ | 0844 3579548 |
| Riviera Networks | Riviera Networks Ltd | PO Box 4371 Hornchurch Essex RM12 9BL | 0845 2702 742 |
| RJR Communications | RJR Communications | The Office 64 Old Vicarage Westhoughton Bolton BL5 2EL | 01942 814 981 |
| RLK Capital Ltd | RLK Capital | 577 Dumbarton Road Glasgow G11 6HU | 01413 425 339 |
| Roadphone Ltd | Roadphone Ltd | Pinfold Road Bourne Lincolnshire PE10 8HT | 01778 421 250 |
| Rockbay Ltd | Rockbay Ltd | Solar House 282 Chase Road London N14 6NZ | 07950 550124 |
| Rocom Network Services | Rocom Network Services | Rudgate Thorp Arch Wetherby West Yorkshire LS23 7RR | 01937-847777 |
| Rosie Red Ltd | Rosie Red | 20 JDEC House London Road Hemel Hempstead Hertfordshire HP3 9QU | 01442 509 022 |
| Rotel Telecommunications Ltd | Rotel Telecommunications Ltd | 12 Dagger Lane West Bromwich West Midlands B71 4BA | 0121 525 5757 |
| RPM Grp Ltd | RPM Grp Ltd T/as RPM Solutions | Cavell House Stannard Place St Crispins Road Norwich NR3 1YE | 01603 821127 |
| RRD Communications Ltd T/A ICA | ICA | 120a Reddish Lane Gorton Manchester M18 7JL | 08707 517 181 |
| RSM 200 Ltd | RSM 2000 Ltd | Wrest Park Silsoe Beds MK45 4HS | 01525 862 555 |
| RSR Communications Ltd | RSR Communications Ltd | 175 Claremont Road Salford Manchester M6 8PA | 0161 790 4392 |
| Rutland Communications Ltd | Rutland Communications Ltd | PO Box 7960 Market Harborough Leicestershire LE16 0AA | 0870 161 3388 |
| Ryedale Telecommunications | Ryedale Telecommunications | Pocklington Business Centre 29 New Street Pocklington YORK YO42 2QA | 0870 777 4880 |
| RZR | RZR | 254 Belsize Road London NW6 4BT | 0870 7668481 |
| S.L.G. Comms Ltd | S.L.G. Comms Ltd | 118 Kensington Road Portsmouth Hampshire PO2 0RB | 08707 701 701 |
| Sabio Network Services Ltd | Sabio Network Services | Enterprise House 1-2 Hatfields London SE1 9PG | 020 7633 3900 |
| Sabre Solutions | Sabre Solutions | 20 Star Road Ashford Kent TN24 8BX | 01233 335 873 |
| Sabre Telecommunications Ltd | Sabre Telecommunications Ltd | 1 Woodingdean Business Park Sea View Way Brighton East Sussex BN2 6NX | 0800 849 2080 |
| Sabre Telecoms Ltd | Sabre Telecom | Suites 203/204 Victoria House Desborough Street High Wycombe Bucks HP11 2NF | 0844 856 1790 |
| SAC Marketing Ltd | SAC Telecom | Lincoln House Derby DE23 8LT | 0870 116 0555 |
| Saga Services Ltd | Saga Telephone Service | The Saga Building Middleburg Square Folkestone Kent CT20 1AZ | 01303 772 132 |
| Sage Telecom Ltd | Sage Telecom | Unit 36 Sandy Road Norton Stourbridge West Midlands DY8 3AH | 0845 3711555 |
| Saints Communications Ltd | Saints Communications Ltd | 8 Foundry Court Daventry Northants NN11 4RH | 0845 4503401 |
| Saiph Communications Ltd | Saiph | Gainsborough House 2 Sheen Road Richmond TW9 1AE | 020 8150 1237 |
| Samite Ltd | Samite Ltd | 21 Princes Road Ealing London W13 9AS | 0208 959 9070 |
| Sansaw Properties Ltd | Sansaw Estates | The Estate Office Sansaw Business Park Hadnall Shrewsbury SY4 4AS | 01939 211100 |
| Savage Minds Ltd | Xenoc Mobile | 117 Waterloo Road London SE1 8UL | 020 3137 1135 |
| Savant Sage Telecommunications Ltd | Savant Sage Telecommunications Ltd | Wembley Point 1 Harrow Road Middlesex HA9 6DE | 0870 750 0641 |
| Save Money on Calls.net (UK) Ltd | Save money on calls.net | Unit 2, Martin Office Village 1250 Chester Road Birmingham B35 7AZ | 0870 752 0060 |
| Save Telecom | Save Telecom | 12 Hood Green Road Barnsley South Yorkshire S75 3HF | 01226 790054 |
| Saveware Professional Contractors | Saveware Professional Contractors | 15 Oak Tree Lane Selly Oak Birmingham B29 6JE | 0121 2480528 |
| Say Telecom Ltd | |||
| SBC Communications Ltd | SBC Comms Ltd | Office 404 4th Floor Albany House 324/326 Regent Street London W1B 3HH | 020 7692 4098 |
| Scalable Networks Plc | Scalable Networks | Endeavour House, Mercury Park Wycombe Lane Wooburn Green Buckinghamshire HP10 0HH | 01628 852 500 |
| SCB Communications Ltd | |||
| Scotland Telecom Ltd | |||
| Scotnet | Scotnet Telecom | 103 Castle Street Inverness IV2 3EA | 0845 270 0010 |
| Scott IT Ltd | LowerCall | Sycamore House 56 Oakfield Road Clifton BRISTOL BS8 2BG | 0800 279 1993 |
| Scottish and Southern Energy PLC | Atlantic | PO Box 360 Portsmouth PO6 2YJ | 0845 300 2320 |
| Scottish and Southern Energy PLC | Scottish Hydro Electric | PO Box 360 Portsmouth PO6 2YJ | 0845 300 2312 |
| Scottish and Southern Energy PLC | Southern Electric | PO Box 360 Portsmouth PO6 2YJ | 0845 300 2320 |
| Scottish and Southern Energy PLC | SWALEC | PO Box 360 Portsmouth PO6 2YJ | 0845 300 2313 |
| Scottish and Southern Energy PLC | talk with | PO Box 360 Portsmouth PO6 2YJ | 02392 624 862 |
| Scottish and Southern Energy PLC | |||
| Sears Communications Ltd | Comms Partner Ltd | 22 South Audley Street Mayfair London W1K 2NY | 020 7078 7980 |
| Sears Communications Ltd | Sears Communications Ltd | 22 South Audley Street Mayfair London W1K 2NY | 020 7491 7491 |
| Sebastian Tate Communications | Sebastian Tate Communications | Riverside House Warwick Road Carlisle Cumbria CA1 2BS | 07920 164453 |
| Secura Telecoms Ltd | Secura Telecoms Ltd | 2a Ashfield Court 111 The Grive Ealing London W5 3SN | 0870 891 0876 |
| Select Telecom Ltd | Select Telecom | Communication House Brunswick Industrial Est Brunswick Village Newcastle Upon Tyne NE13 7BA | 0191 2173960 |
| Selling Situations Ltd | Your First Contact | Your First Contact E-Volve Business Centre Cygnet Way Tyne & Wear DH4 5QY | 0845 872 8888 |
| Semtec Ltd T/A SAQ | SAQ | 18 Chapel Street Petersfield Hampshire GU32 3DZ | 0870 7377700 |
| Senokian Internet Ltd | Senokian Internet Ltd | Business Innovation Centre Binley Business Park Harry Weston Road Coventry CV2 2TX | 02476 233 400 |
| Sensibill Ltd | Sensibill Ltd | Caspian House Timothy's Bridge Road Statford-Upon-Avon CV37 9NR | 0845 2415514 |
| Sentinel Telecom Ltd | |||
| Sentiro Ltd | Sentiro Ltd | 6 Cole Park View St Margarets, Twickenham TW1 1JW | 0870 872 0750 |
| SEP Solutions | SEP Solutions | 31 Kimberley Road Nuthall Nottingham NG16 1DA | 0845 0550577 |
| Serano Communications Ltd | |||
| Serez Ltd | |||
| Sermo Telecom Ltd | Sermo Telecom Ltd | Knoll House Knoll Road Camberley Surrey GU15 3SY | 0845 4507950 |
| Service Direct (UK) Plc | |||
| Service Direct Ltd T/a Advance Group | Service Direct Ltd T/a Advance Group | Advance House North Circular Road London NW10 7SH | 0208 961 7000 |
| Service F1rst Ltd | SERVICE F1RST Ltd | PO Box 791 Over Cambridgeshire CB4 5WW | 0845 4033 685 |
| Service Telecom Ltd | Service Telecom Ltd | Orient House Newton Street Hyde SK14 4RY | 0161 351 4800 |
| SES Computers | SES DATA SOLUTIONS | Banbury House 5 Market Street Weymouth Dorset DT4 8DD | 01305 774402 |
| SES Telecom | SES Telecom | 167 Lymington Road Christchurch, Dorset BH23 4JS | 0870 758 1100 |
| Sesui Ltd | Sesui Ltd | Magdalen Centre Oxford Science Park Oxford OX4 4GA | 08445 600600 |
| Setel Ltd | Setel Ltd | Tower House 226 Cromwell Road London SW5 0SW | 08700 330270 |
| Shaftesbury Systems Ltd | Shaftesbury Systems Ltd | 11th Floor Maple House High Street Potters Bar EN6 5BA | 0870 787 8586 |
| Shared Communications | Shared Communications | Winchester House Deane Gate Avenue Taunton Somerset TA1 2UH | 0300 330 0530 |
| Sheaf Telecom Ltd | Sheaf Telecom Ltd | 23 Mauncer Drive Sheffield S13 7JE | 0845 225 0003 |
| Shebang Distribution UK Ltd | EBS | 2 Lamport Court Heartlands Business Park Daventry Northants NN11 8UF | 01327 709 200 |
| Shebang Distribution UK Ltd | Go Direct | 2 Lamport Court Heartlands Business Park Daventry Northants NN11 8UF | 01327 709 200 |
| Shebang Distribution UK Ltd | Nexxus | 2 lamport Court Daventry Northants NN11 8UF | 0800 0822002 |
| Sherwood Solutions Ltd | |||
| Shimmer Telecom Ltd. | |||
| Shine Telecom Ltd | Shine Telecom | 127/129 Portland Street Manchester M1 4PZ | 0845 4566990 |
| Shipton Communications Ltd | Shipton Communications | Network Services Dept Shipton Comunications Ltd, 1 Frogmore Industrial Estate Frogmore Road, Hemel Hempstead Hertforshire HP3 9TG | 01442 345600 |
| Shore Communications | Shore Communications | Mint House 4-6 Stanley Road Wallington Surrey SM6 0EU | 0870 4299876 |
| Siebert Industries Ltd | Siebert Industries Ltd | Blackfaulds House Drumhead Place Cambuslang Investment Park Cambuslang, Glasgow G32 8EY | 0870 050 2266 |
| Siemens Communications Ltd | Siemens Managed Network Services | Turnells Mill Lane Wellingborough Northamptonshire NN8 2RB | 01933 444 363 |
| Sigma Telecom Ltd | Sigma Telecom | 29 Gay Street Bath BA1 2NT | 01225 444464 |
| Sigma Voice Solutions Ltd | Sigma Voice Solutions Ltd | Trafalgar House Fullbridge Maldon Essex CM9 4LE | 0844 7700075 |
| Signum Communications Ltd | Signum Communications Ltd | The Old Rectory Main Street Glenfield, Leicester LE3 8DG | 0870 170 9696 |
| Signum Corporate Communications Ltd | Signum Corporate Communications | The Old Rectory Main Street Glenfield, Leicester LE3 8DG | 0870 170 9696 |
| Silver Lining Convergence Ltd | Silver Lining Consultancy | Silver Lining Convergence Ltd Unit 20 Regent Trade Park Barwell Road PO13 0EQ | 07789 625907 |
| Simon & Alethea Ghent t/a Unitycomm | Unitycomm | 1 Fishpond Way Loughbrough Leics LE11 2SF | 0845 652 0670 |
| Simplicity Communications Ltd | Simplicity Communications Ltd | Kings House Station Road Kings Langley Hertfordshire HP1 3DP | 0844 669 1276 |
| Simplisity Communications Ltd | Simplisity Communications Ltd | 29a Nascot Wood Road Watford Herts WD17 4WE | 08700 420 484 |
| SIPsys Ltd | SIPsys VoxCom | Charwell House Wilsom Road Alton Hampshire GU34 2PP | 0845 0045059 |
| Siptel Net Ltd | Siptel Net Ltd | Surrey Research Park 40 Occam Road Guildford SURREY GU2 7YG | 0870 871 1400 |
| Sirocom Ltd | Sirocom | St. Georges Business Park Weybridge Surrey KT13 0TS | 01932 264 700 |
| Sitel Ltd | Sitel Ltd | The Coach House Berden Bishops Stortford CM23 1AB | 0844 8006202 |
| Skills Develper Ltd | SD Voice Services | Malvern House New Road Solihull B91 3DL | 0121 2700370 |
| Skills Develper Ltd | Skills Develper Ltd | Malvern House New Road Solihull B91 3DL | 0121 2700370 |
| Sky Blue Telecom Ltd | |||
| Sky Teledata Ltd | Sky Teledata | Rugby Chambers 2 Rugby Street Holborn London WC1N 3QU | 020 7096 6367 |
| Skymaker Ltd | Skymaker Ltd | Unit 12 Lady Lane Industrial Estate Hadleigh Ipswich, Suffolk IP7 6BQ | 01473 823 344 |
| Smart Connection Co Ltd | Azzurri Comunications Ltd | Farrington Road Burnley BB11 5FH | 01282 463 102 |
| Smart Marketing Services Ltd | |||
| Smart Talk Solutions Ltd | Smart Talk Solutions | 19 Crane Street Pontypool NP4 6LY | 01495 759615 |
| SmartCall Direct Ltd | SmartCall Direct Ltd | Windmill Business Park 304 Commonside East Mitcham Surrey CR4 1HX | 020 8648 5200 |
| SmartCall Direct Ltd | SmartCall Services Ltd | Windmill Business Park 304 Commonside East Mitcham Surrey CR4 1HX | 020 8648 5200 |
| Smartcom Plus Ltd | Smartcom Plus Ltd | Dalton House 60 Windsor Avenue London SW19 2RR | 0845 873 7331 / 07900 076302 |
| Smartinfo | Smartinfo | 49-59 Old Street London EC1V 9MX | 0870 750 0848 |
| SME System Solutions Ltd | SME System Solutions Ltd | Units 1-3 85b Ashford Road Eastbourne East Sussex BN21 3TE | 01323 648666 |
| SMH Company (UK) Ltd | SMH Telekom | PO Box 400 Darlington Co. Durham | 01325 363467 |
| Smile Telecoms Ltd | Smile Telecoms | June Almond House Mary Street Manchester M3 1DZ | 0161 834 3316 |
| Software Automation Services UK Ltd | SAS UK Telecom | 22 Bolton Close Isleport Business Park Highbridge Somerset TA9 4JR | 0844 264 0844 |
| Softwire Voice and Data Ltd | FC Telecoms | 69 Dalkeith Road Dundee DD4 7HF | 01382 453 344 |
| Solacom Ltd | Solacom Ltd | 127 - 129 Portland Street Manchester M1 4PZ | 0845 683 2575 |
| Solar Communications Ltd | Solar Communications Ltd | Unit 5/6 Rowan House Sheldon Business Park Chippenham SN14 0SQ | 08450 730007 |
| Solid Systems Computer Services Ltd | Solid Telecoms | Ajit House Prime Enterprise House Prime Parkway Derby DE1 3QB | 08700 772 726 |
| Solution Consultants | Solution Consultants | Woodberry Cottage Green Lane Pangbroune Berkshire RG8 8LD | 0871 222 2133 |
| Solution IP Communications Ltd | Solution IP Communications | 3, Basement Flat Buckingham Place Clifton Bristol BS8 1LH | 0871 222 9422 |
| Solution1 Ltd | Solution1 | Sugarbond 2 Anderson Place Edinburgh EH6 5NP | 0870 9061111 |
| Solutions in Technology (IT) Ltd | Solutions in Technology (IT) Ltd | Raglan House Llantarnam Park Cwmbran Gwent NP44 3AB | 01633 48700 |
| Solutions Inc Ltd | FREEDOM255 | The Joinery 255 Old Shoreham Road Brighton & Hove East Sussex BN3 7ED | 01273 200777 |
| Solutios Ltd | Solutios Ltd | 38 Skyline Court Grange Yard London SE1 3AN | 020 7167 - 5555 |
| Solwise Telephony Ltd | Solwise Telephony | Dennis House Hawley Road Hinckley Leicestershire LE10 0PR | 0845 006 0800 |
| Something Corporation Plc | Something Corporation PLC | 240 High Holborn London WC1V 7DN | 0871 664 1500 |
| SOMLINK ltd | SomLink | 255a Harehills Lane Leeds LS8 3RG | 07867 601415 |
| Sontel Communication Networks Ltd | SCN Ltd | Unit 8, Bowes Estate Wrotham Road Meopham Kent DA13 0QB | 0845 073 0300 |
| Sospito Communications Ltd | Sospito Communications | 29th Floor One Canada Square Canary Wharf London E14 5DY | 08701 458 280 |
| Sota Solutions Ltd | |||
| South Tyneside Council | South Tyneside Council | Town Hall & Civic Offices South Shields Tyne and Wear NE33 2RL | 0191 427 1717 |
| South West Communications Group Ltd | South West Communications Group Ltd | Communications House Moor Lane Sowton Exeter EX2 7JA | 01392 369369 |
| Southern Communications Ltd | Southern Communications Ltd | Glebe Farm, Down Street Dummer Basingstoke Hampshire RG25 2AD | 0845 634 0800 |
| Sovereign Communications Ltd | |||
| SPA Business Services Ltd | SPA Business Services Ltd | Crossbow House 40 Liverpool Road Slough SL1 4QZ | 01753 610540 |
| Spa Telecoms Ltd | Spa Telecoms Ltd | Raglan House Westminster Bank West Malvern Worcs WR14 4BN | 01684 580591 |
| Sparks Business Systems Ltd | Sparks Business Systems Ltd | Bank Building Bridgend Industrial Estate Bridgend CF31 3SB | 0870 3003335 |
| Speak Media Ltd | Speak Media | Suite 1 The Old Bank 2 Coventry Street Stourbridge, West Midlands DY8 1EP | 0844 418 0910 |
| Specialist Contractors Confederation Ltd | SCC Telecoms | Oak Lodge Farm Lodge Lane East Farliegh, Maidstone Kent ME15 0HQ | 0870 042 1710 |
| Specialist Cost Auditing Lyd t/a SCA | Telstra | 3 Finsbury Square London EC2A 1AE | 020 7965 8800 |
| Specialist Cost Auditing Lyd t/a SCA | Telstra Europe Ltd | 3 Finsbury Square London EC2A 1AE | 020 7965 8800 |
| Spectrum Telecommunications Ltd | SPECTRUM COMS | Thatched Cottage Woodhouses Yoxall Burton-on-Trent DE13 8NR | 0845 450 8292 |
| SpiriTel Networks Ltd | SpiriTel Business | Dobson Park Way Ince Wigan WN2 2DX | 01942 221122 |
| SpiriTel Technologies Ltd | SpiriTel Technologies | 18 King William Street London EC4N 7BP | 020 7160 0100 |
| Spitfire Network Services Ltd | Spitfire | 6-7 SBBC Ponton Road London SW8 5BL | 020 7501 3030 |
| Splash Telecom Ltd | Splash Telecom Ltd | 42-44 Cariocca Business Park Hellidon Close Ardwick Manchester M12 4AH | 0870 4118811 |
| Splitsec Ltd | Splitsec Ltd | Waterfront House New Brunswick Thornes Lane Wakefield WF1 5QW | 0845 4090080 |
| Sports Club Telecom Ltd | Sports Club Telecom Ltd | 8 The Hollows Ayr Road GLASGOW G46 7JB | 08458 800 558 |
| Spread Media Ltd | Spread Media Ltd | Unit 9, Wheatley Business Centre Old London Road Wheatley Oxford OX33 1YW | 0870 243 3086 |
| Sprint Communications Systems | Sprint Communication System | MKM House 6-16 Baron Road South Woodham Ferrers Essex CM3 5XQ | 0844 5449540 |
| Sprint Ltd T/A SCS | Sprint Ltd T/A SCS | Unit F Hove Technology Centre St Josephs Close Hove BN3 7ES | 0870 608 2801 |
| Sproutt Ltd | Sproutt Ltd | Tredomen Innovation Centre Tredomen Business Park Hengoed Mid-Glamorgan CF82 7FN | 08456 446640 |
| Squaretech Ltd | Squaretech | Suite 2 Vista Business Centre 50 Salisbury Road Hounslow, Middlesex TW4 6JQ | 0800 082 1083 |
| SRS Telecom Ltd | SRS Telecom Ltd | Communications House Pitreavie Drive Dunfermline KY11 8US | 01383 841 200 |
| SSP Com Ltd | |||
| Starcomm Ltd | Starcomm Ltd | 1 School House Terrace Kirk Deighton, Leeds LS22 4EH | 01937 878 686 |
| Stardex (UK) Ltd | Stardex UK | 21 Ashton Road Glasgow Strathclyde G12 8SP Scotland | 0870 792 8888 |
| Startel Ltd | |||
| S-Tel Communications Group Ltd | |||
| Stella Communications Ltd | Stella Communications Ltd | PO Box 303 Plymouth PL8 1XQ | 0870 033 0522 |
| Sterling Syncordia | Sterling Syncordia | Sterling House 102a Station Road Sidcup Kent DA15 7DE | 08453 109010 |
| Sterling Telecommunications Ltd | |||
| Sterry Communications UK Ltd | |||
| Stirling IT Solutions LLP | |||
| STL Network Ltd | Intellion Ltd | Park House Station Lane Witney Oxon OX28 4LH | 01993 777180 |
| STL Network Ltd | STL Network Ltd | Park House Station House Witney Oxon OX28 4LH | 01993 777180 |
| Storacall Technology Ltd (Trading As X-ON) | X-ON | Storacall Technology Ltd (Trading As X-ON) Technology Center Station Road Framlingham, Suffolk IP13 9EZ | 0870 345 5577 |
| Straight Talking Telco Ltd | Straight Talking Telco Ltd | Premier Business Centre 47-49 Park Royal Road London NW10 7LQ | 020 7998 6898 |
| Stranks Communications | |||
| Stream Networks Ltd | Stream Networks Ltd | Gainfield House Gainfield Faringdon SN7 8QQ | 01635 884 170 |
| Stripe 21 Ltd | Stripe 21 Ltd | The Atrium Curtis Road Dorking Surrey RH4 1XA | 0845 872 2121 |
| Sun Management Ltd | |||
| Sunley Communications Ltd | Sunley Communications Ltd | 6 Flamstead end road Cheshunt Herts EN8 OHH | 01992 645 040 |
| Sunny Communications Ltd | Sunny Communications Ltd | 4com House, 2 Watt Road Churchfields, Salisbury Wiltshire SP2 7UD | 0844 5762222 |
| Sunstone Telecom | Sunstone Telecom | West Wing (1st Floor) Queensway House 207-209 Queensway, Bletchley Milton Keynes MK2 2ED | 01908 370981 |
| Supanet Ltd | Supanet | Indigo House Blackburn Road Simonstone Burnley, Lancashire BB12 7NQ | 0870 830 3122 |
| SuperLINE Telecommunications Ltd | |||
| Supply Communications | Supply Communications | Unit A1 Church Lane Business Park Church Lane Nursling Southampton SO16 0YB | 0844 414 20 30 |
| Supply Communications | Supply Network | Unit A1 Church Lane Business Park Church Lane Nursling Southampton SO16 0YB | 0844 414 20 30 |
| Support Telecom Ltd | Support Telecom | Unit 4, Rays Farm Barns Roman Road Ingatestone Essex CM4 9EH | 0800 8048840 |
| Support UK | Support UK | Indigo E Rainbow Industrial Estate Trout Road West Drayton UB7 7XT | 0845 0580330 |
| Sure Telecom Ltd | Sure Telecom Ltd | Connect House P.O. Box 143 Swansea SA2 0WT | 0870 990 9939 |
| Suretec Systems Ltd | SureVOIP | The James Gregory Centre Campus 2 Balgowine Road AB22 8GU | 01224 279 484 |
| Svargtel | |||
| Swains Voice & Data plc | Swains Voice & Data plc | Eastland House Hunstanton Norfolk PE36 5EW | 0845 241 4100 |
| Sweet Telecom Ltd | Sweet Telecom Ltd | 19 Station Road Romsey Hants SO51 8DP | 0808 202 2021 |
| Swift Communication Ltd | Swift-Call | Blakedown House Village Farm Estate Bridgend CF33 6BJ | 01656 303030 |
| Swift Telecom Ltd | Swift Telecom Ltd | Howard House Bryon Avenue Felixstowe IP11 3HZ | 0870 1690070 |
| Swift Telecommunications UK Ltd | |||
| Swiftnet Ltd | Swiftnet Ltd Xfone Inc | Britania House 960 High Road London N12 9RY | 0800 8145555 |
| SWIS Communications Ltd | SWIS Communications Ltd | 11b Sherbrook Hill Budleigh Salterton Devon EX9 6DA | 0870 066 6608 |
| Switch Communications | Switch Communications | Units 1&2 Hogarth Court Hogarth Crescent Croydon CR0 2JE | 020 8664 5555 |
| Switch Providers Ltd | Switch Providers | 3 Trinity Street Stratford-upon-Avon Warwickshire CV37 6BL | 0871 5 75 75 20 |
| Switch Telecoms Ltd | Switch Telecoms Ltd | Building 891 Plymouth Road Trading Estate Slough SL1 4EE | 01753 696 556 |
| Switch Utilities | Switch Utilities | Newbrook House 385 Alfreton Road Nottingham NG7 5LR | 0845 634 1005 |
| Switch2 Telecoms Ltd | Switch 2 | Sir John Moore Building 100 Old Hall Street Liverpool L70 1AB | 0151 235 2222 |
| Switch2Mobile Ltd | Switch2CheaperCalls | Elwood House 42 Lytton Road Barnet Hertfordshire EN5 5BY | 0871 666 4293 |
| Switchconnect Ltd | Switchconnect Ltd | Switch House 3 Berkeley Crescent Clifton Bristol BS8 1HA | 08456 522222 |
| Symphony Telecom Ltd | Symphony Telecom Ltd | Telford House Corner Hall Hemel Hempstead, Hertfordshire HP3 9HN | 01442 283 300 |
| Synergy Corp Ltd | Synergy Sanity | 21 Park Royal Metro Center Britannia Way LONDON NW10 7PA | 020 8965 8964 |
| SynergyOne Ltd | Synergyone Ltd | Salisbury House 81 High Street Potter Bar Herts EN6 5AS | 01707 291291 |
| Synetrix Ltd | Synetrix Ltd | Innovation Centre Keele Park Staffordshire ST5 5NB | 01782 338200 |
| Synex Network Services Ltd | Synex Network Services Ltd | Warwick House 35 Spring Road Hall Green, Birmingham B11 3EA | 0808 144 4040 |
| Syntec UK Ltd | Syntec uk Ltd | 18 The Avenue London W13 8PH | 0845 092 2004 |
| Syscomm Ltd | Syscomm Ltd | Syscomm House Park Road Kenilworth Warwickshire CV8 2GF | 01926 856000 |
| System Online Ltd | System Online Ltd | 250 Main Road Gidea Park Romford Essex RM2 5EQ | 0845 643 0720 |
| Systematix Computer Solutions Ltd | sysTALK | Claverton House Love Lane Cirencester GL7 1YG | 0870 845 1525 |
| SYSTEMCARE (UK) LTD | Systemcare (UK) Ltd | 108 Worth Street Portslade, East Sussex BN41 1DG | 0870 166 2400 |
| Systems (Telecoms) Ltd | |||
| Systems Supported Ltd | Telefonix | 11A Camp Road North Camp Farnborough Hampshire GU14 6EN | 01252 333888 |
| SystemTalk Ltd | TotalTalk-IP | Berkeley House 18-24 High Street Edgware Middlesex HA8 7RP | 0845 051 8264 or 020 8150 9300 |
| T I Crystal Ltd | T I Crystal Ltd | 5-7 Vaughton Street South Birmingham B12 0YN | 0871 2262135 |
| T.T.C. Ltd | T.T.C. Ltd | Telephone House New Pudsey Court 105 Bradford Road Pudsey, Leeds LS28 6AT | 0113 236 2500 |
| T.T.N.C. Ltd | T.T.N.C. Ltd | Carlton House 101 New London Road Chelmsford Essex CM2 0PP | 0870 468 6868 |
| T1 Telecom's Ltd | T1 Telecom's Ltd | Coates School 2 Jersey Street Manchester M4 6JB | 0870 9022020 |
| T24 Ltd | T24 Ltd | The Terraces Tannery Court Tanners Lane Warrington, Cheshire WA2 7NR | 01925 259401 |
| T2M Telecom Ltd | T2M Telecom Ltd | T2M House Mallard Business Centre Mallard Road Bretton, Peterborough PE3 8YR | 0845 603 0603 |
| Tadiran UK Ltd | Tadiran | 11-15 Columbus Walk Cardiff CF10 4BZ | 02920 020 700 |
| Tailored Telecoms Ltd | Tailored Telecoms | Tailored Telecoms Cust. Services PO Box 270 Leeds LS14 9AU | 0845 358 1000 |
| TailorMade Talk Ltd | TailrMade Talk Ltd | Bridge House 7/9 Church Road Bristol BS5 9JJ | 0117 9559830 |
| Takeda Telecom | Takeda Telecom | Cygnet Court Hawthorn Street Wilmslow Cheshire SK9 5EL | 01625 416 200 |
| Talk (Voice & Data) Uk | |||
| Talk Cheap Ltd | Talk Cheap Ltd | 23 Lower Green Poulton Lancashire FY6 7JL | 01253 899 482 |
| Talk Greener Ltd | Talk Greener Ltd | Units 3-4 Boundary Business Court 92-94 Church Road Mitcham, Surrey CR4 3TD | 020 8274 4040 |
| Talk Internet Ltd | Talk-101 | Suite 12, Xpdia, Crab Lane, Warrington. WA2 0XP | 0845 310 1010 |
| Talk On Ltd | TalkON | Armour House Armour Road Reading RG31 6HF | 0870 224255 |
| Talk Plus Telecom Ltd | Talk Plus Telecom Ltd | 5th Floor Swan Court Waterhouse Street Hemel Hempstead, Herts HP1 1DS | 08448 759041 |
| Talk Straight Ltd | Talk Straight | Mayfield House 5a Little Lane IIkley West Yorkshire LS29 8EA | 01133 221 880 |
| TALK Telecommunications Ltd | |||
| Talk UK | Talk UK | 25 Castlegate Berwick-upon-Tweed Northumberland TD15 1LF | 0870 224 1400 |
| Talking Business Southern Ltd | Talking Business Southern Ltd | Unit 31, The Ridgeway Industrial Estate Iver Slough Berkshire SL0 9HW | 01753 659 821 |
| Talking Technology Ltd | Talking Technology Network Services TTNS | Technology House 11 Palmerston Road Sutton, Surrey SM1 4QL | |
| Talknet Systems | Talknet Systems Ltd | 65 Hillview Road High Bonnybridge Falkirk FK4 2ER | 0870 7515201 |
| Talkya Communications UK Ltd | TALKYA | 198 Ashenhurst Road Dudley West Midlands DY1 2HZ | 0844 412 4498 |
| Tallycost Ltd | TALLCOST Ltd | Swifts Cottage The Old Barn Friskney Lincolnshire PE22 8NJ | 01754 820 997 |
| Tallycost Ltd | TALLYCOST.COM | Swifts Cottage The Old Barn Friskney Lincolnshire PE22 8NJ | 01754 820 997 |
| Tallycost Ltd | URBROADBAND.CO.UK | Swifts Cottage The Old Barn Friskney Lincolnshire PE22 8NJ | 01754 820 997 |
| Tallycost Ltd | URbroadband.co.uk | Swifts Cottage The Old Barn Friskey Lincolnshire PE22 8NJ | 01754 820 997 |
| Tancroft Communications Ltd | Tancroft | Studio House 42 Ravenshurst Avenue London NW4 4EG | 020 8457 6000 |
| Taphon Ltd | Taphon Ltd | 5 Olympic Business Centre Paycocke Road Basildon Essex SS14 3EX | 01268 530 066 |
| Tariff Reduction Services Ltd | Tariff Reduction Services Ltd | The Hollies Chester Road Whitchurch, Shropshire SY13 1LZ | 0870 777 1124 |
| Taurus Clearer Communications Ltd | Taurus Clearer Communications Ltd | Orchard Court Heron Road Sowton Estate, Exeter Devon EX2 7NR | 01392 202000 |
| TCL Communications Ltd | TCL Communications Ltd | 67 Crabtree Lane London SW6 6LP | 020 7381 1321 |
| TDC Global Plc | TDC Netwk | 11 Somerset Road Edgbaston Birmingham B15 2QB | 0121 693 1017/1018 |
| Team Partners Telecommunications Ltd | Team Partners Telecommunications | 16 Whitehouse Street Bristol BS3 4AY | 0845 833 4555 |
| Team Telecom UK Ltd | Team Telecom UK Ltd | 5 Windsor Court Clarence Drive Harrogate HG1 2PE | 08451 261 621 |
| Tech Networks Ltd | Tech Networks Ltd | 11 Lisbon Square Leeds LS1 4LY | 0870 300 3110 |
| Tech Networks Ltd | Tech Networks Telecom | 11 Lisbon Square Leeds LS1 4LY | 0870 300 3110 |
| Tech Networks Ltd | TechNet Telecom | 11 Lisbon Square Leeds LS1 4LY | 0870 300 3110 |
| Tech Networks Ltd | TN Telecom | 11 Lisbon Square Leeds LS1 4LY | 0870 300 3110 |
| Techcomm Ltd | Techcomm | The Lodge Oakridge Avenue Radlett WD7 8EW | 0845 389 9110 |
| Technologies Telecom Ltd | Baggies Telecom | 14/15 The Quadrangle 49, Atalanta St London SW6 6TU | 0870 224 8789 |
| Technologies Telecom Ltd | Barkat Telecom | 14/15 The Quadrangle 49 Atalanta Street London SW6 6TU | 020 7096 9500 |
| Technologies Telecom Ltd | Barnardos Telecom | 14/15 The Quadrangle 49, Atalanta St London SW6 6TU | 0870 224 8787 |
| Technologies Telecom Ltd | Bristol City FC Telecom | 14/15 The Quadrangle 49 Atalanta Street London SW6 6TU | 020 7096 9500 |
| Technologies Telecom Ltd | Bristol Telecom | SW6 6TU | 0870 224 9901 |
| Technologies Telecom Ltd | Cookie Communications | SW6 6TU | 0207 096 9500 |
| Technologies Telecom Ltd | Countryside Alliance Telecom | SW6 6TU | 0870 224 9913 |
| Technologies Telecom Ltd | Falcons Telecom | SW6 6TU | 0870 224 9912 |
| Technologies Telecom Ltd | Foxes Telecom | SW6 6TU | 0870 224 8784 |
| Technologies Telecom Ltd | Fulham FC Telecom | SW6 6TU | 0870 224 8781 |
| Technologies Telecom Ltd | Giants Telecom | SW6 6TU | 0870 224 9902 |
| Technologies Telecom Ltd | Gloucester Rugby Telecom | SW6 6TU | 0870 224 9903 |
| Technologies Telecom Ltd | Hammers Telecom | 14/15 The Quadrangle 49 Atalanta Stree London SW6 6TU | 020 7096 9500 |
| Technologies Telecom Ltd | Islam Telecom | 14/15 The Quadrangel 49 Atalanta Street London SW6 6TU | 020 7096 9500 |
| Technologies Telecom Ltd | Latics Telecom | 14/15 The Quadrangle 49 Atalanta Road London SW6 6TU | 020 7096 9500 |
| Technologies Telecom Ltd | London Bronco Telecom | SW6 6TU | 0207 096 9500 |
| Technologies Telecom Ltd | London Irish Telecom | SW6 6TU | 0870 224 9911 |
| Technologies Telecom Ltd | Pompey Telecom | 14/15 The Quadrange 49, Atalanta St London SW6 6TU | 0870 224 8788 |
| Technologies Telecom Ltd | Potters Telecom | 14/15 The Quadrangle 49, Atlanta St London SW6 6TU | 0870 224 8785 |
| Technologies Telecom Ltd | Quins Telecom | SW6 6TU | 0870 224 9906 |
| Technologies Telecom Ltd | Reds Telecom | SW6 6TU | 0870 224 9909 |
| Technologies Telecom Ltd | Rhinofone | SW6 6TU | 0870 224 9904 |
| Technologies Telecom Ltd | Saddlers Telecom | SW6 6TU | 0870 224 8782 |
| Technologies Telecom Ltd | Saints Rugby Telecom | SW6 6TU | 0870 224 9905 |
| Technologies Telecom Ltd | Saracens Telecom | SW6 6TU | 0870 224 9910 |
| Technologies Telecom Ltd | Sky Blues Telecom | SW6 6TU | 0870 224 9915 |
| Technologies Telecom Ltd | Technologies Telecom | SW6 6TU | 0207 096 9500 |
| Technologies Telecom Ltd | Tigers Telecom | SW6 6TU | 0870 224 9907 |
| Technologies Telecom Ltd | Toffee Telecom | SW6 6TU | 0870 224 9914 |
| Technologies Telecom Ltd | Tykes Telecom | SW6 6TU | 0870 224 9904 |
| Technologies Telecom Ltd | Villa Telecom | 14/15 The Quadrangle 49, Atlanta St London SW6 6TU | 0870 224 8786 |
| Technologies Telecom Ltd | Wasps Telecom | SW6 6TU | 0870 224 9908 |
| Technologies Telecom Ltd | Wolves Telecom | SW6 6TU | 0870 224 8783 |
| Technologies Telecom Ltd | Woodenspoon Telecom | SW6 6TU | 0870 224 8780 |
| Technology Box Ltd | Technology Box | 45 Robertson Street Hastings East Sussex TN34 1HL | 0845 890 4717 |
| Technology Services Group | Technology Services Group | One Gosforth Parkway Gosforth business Park Newcastle Upon Tyne NE12 8ET | 0191 2561166 |
| Technology Telecom Ltd | Technology Telecom Ltd | 37-39 Hawbank Road East Kilbridge G74 5EG | 01355 595 323 |
| Techtel Communications Ltd | |||
| Techxpert | Techxpert | 2 Hartsbourne Drive Bournemouth BH7 7JB | 01202 425007 |
| Tecnica Communications Ltd | Tecnica Communications Ltd | The Malvern Suite Borough Mill Neild Street Oldham OL8 1QG | 0161 622 2916 |
| Teesside Technology Solutions Ltd | TTSCom | South Tees Business Centre Puddlers Road Middlesbrough TS6 6TL | 0845 634 6263 |
| Telappliant Ltd | Telappliant Communications | 38-39 St John's Lane London EC1M 4BJ | 0845 004 4040 / 020 7043 3490 |
| Tel-bureau Ltd | Tel-bureau | 10th Floor Alexandra House Alexandra Road Swansea SA1 5ED | 01792 646101 |
| Telco Global Networks Ltd | |||
| TelCo Management Ltd | TelCo Management Ltd | 94-95 NMBC Knowlsley Industrial Park Knowsley L33 7UY | 0151 545 4500 |
| Telcoinabox Ltd | NOA (UK) | Advance House Liphook Way 20/20 Business Park, Maidstone Kent ME16 0LQ | 01642 680 999 |
| Telcoinabox Ltd | Telcoinabox | Lemon Studios 85 Clerkenwell Studios London EC1R 5AR | 020 3326 5555 |
| Tele Dot Comm Ltd | Tele Dot Comm Ltd | Diva House 10 Hawthorn Close New Milton, Hampshire BH25 5BB | 01425 619 636 |
| Tele2 UK Services Ltd | Alpha Telecom | 391 Richmond Road Twickenham Middlesex TW1 2EF | 020 7894 9880 |
| Tele2 UK Services Ltd | Tele2 UK | 391 Richmond Road Twickenham Middlesex TW1 2EF | 020 7894 9880 |
| Telebusiness Ltd | Telebusiness Ltd | 51 Chaplin Close Salford M6 8FW | 0161 8701870 |
| Telecall Communications Ltd | Jabbertalk | Flint House Bakery Lane Bognor Regis West Sussex PO21 1UR | 07092 312 455 |
| Telecall Communications Ltd | Telecall | Flint House Bakery Lane Bognor Regis West Sussex PO21 1UR | 0870 777 8730 |
| Telecall Communications Ltd | V over B | Flint House Bakery Lane Bognor Regis West Sussex PO21 1UR | 07092 312 455 |
| Telecall Ltd | |||
| Telecom (GB) Ltd | Telecom (GB) Ltd | Cyprus House 94-96 Cyprus Road Leicester LE2 8QS | 0870 758 0280 |
| Telecom 2000 | Telecom 2000 | 24 Dudley Street Grimsby DN31 2AB | 01472 230 678 |
| Telecom 2000 Ltd | Telecom 2000 Network Services | 3 Minster Industrial Park West Moors Wimborne Dorset BH21 6QF | 01202 895 111 |
| Telecom 4 Business Ltd | |||
| Telecom Bill Ltd | Chat To Us | PO Box 13 Portrush Co. Antrim BT56 8WZ | 08700 493 822 |
| Telecom Bill Ltd | MCA Communicaitions | 74 Clonmore Road Dungannon BT71 6NB | 08700 493 820 |
| Telecom Bill Ltd | Telecom Bill | P O Box 13 Portrush Co. Antrim BT56 8WZ | 08700 493 821 |
| Telecom Bill Ltd | UK Telecom | PO Box 13 Portrush Co.Antrim BT56 8WZ | 08700 493 824 |
| Telecom Bill Ltd | Your Phone | P O Box 13 Portrush Co. Antrim BT56 8WZ | 08700 493 823 |
| Telecom Direct Ltd | Telecom Direct Ltd | 20 Park Gate Milton Park Abingdon, Oxon OX14 4SH | 01235 442 300 |
| Telecom Maintenance | Telecom Maintenance | 77 Mount Street Liverpool L3 5TB | 0151 7091212 |
| Telecom Network Solutions Ltd | Team Network Solutions Ltd | 39 Aldershaw, Shirley, West Midlands B90 1SQ | 0800 157 7700 |
| Telecom plus PLC | Utility Warehouse | Dryden House The Edge Business Centre Humber Road London NW2 6EW | 020 8955 5333 |
| Telecom Solutions International Ltd | Telecom Solutions International Ltd | 23-27 Endsleigh Road Merstham Surrey RH1 3LX | 0870 774 6352 |
| Telecom Strategies Ltd | Telecom Strategies | PO Box 969 Appleton Thorn Cheshire WA4 9DL | 01925 212765 |
| Telecom UK | |||
| Telecom Warehouse Ltd | Telecom Warehouse Ltd | Prestige House Cornford Rd Blackpool FY4 4QQ | 08700 554 155 |
| Telecom Wholesale UK Ltd | |||
| TelecomIT Ltd | TelecomIT Ltd | 36 Warren House Walk Sutton Coldfield West Midlands B76 1TS | 0870 411 1110 |
| Telecomm Europe Ltd | Telecomm Europe Ltd | Studio 29 Abbey Mills Sir James Clark Building Paisley PA1 1TJ | 0141 887 8485 |
| Telecomms Direct Ltd | Telecomms Direct Ltd | 28-30 Belle Vue Terrace Malvern Worcs WR14 4PZ | 01684 588 405 |
| Telecommunications Managements Ltd | |||
| Telecoms 2000 Ltd | |||
| Telecoms Bridgend Ltd | Telecoms Bridgend Ltd | Unit 9d Garth Drive Brackla Ind Est Bridgend CF31 2AQ | 0800 0933652 |
| Telecoms Connect Ltd | Telecoms Connect Ltd | Unit 11 Agecroft Network Centre Lamplight Way Salford, Manchester M27 8UJ | 0161 351 6766 |
| Telecoms Consortium Ltd | |||
| Telecoms Network Ltd | Telecoms Network Ltd | 1 Raynham Road Bishops Stortford, Hertfordshire CM23 5PB | 0870 770 2424 |
| Telecoms World Plc | |||
| Teleconnect Service Ltd | Teleconnect Service Ltd | 2 Deanhurst Park Gelderd Road Gildersome Leeds LS27 7LG | 0113 217 2030 |
| Teledesign plc | Choice Numbers Ltd | 18 Worsley Grange Kemnal Road Chislehurst Kent BR7 6NL | 020 7047-4444 |
| Teledesign plc | Rock Telecom | 40 St James's Place St James's London SW1A 1NS | 020 7047 5000 |
| Teledesign plc | Teledesign plc | The White House 1 The Broadway Old Hatfield Herts AL9 5BG | 020 7047 0000 |
| Teledesign plc | Teledesign Solutions Ltd | The White House 1 The Broadway Old Hatfield Herts AL9 5BG | 020 7047 1000 |
| Telefonic Ltd | Telefonic | 38 Layfield Road London NW4 3UG | 020 8989 0109 |
| Telefonica O2 UK | Telefonica O2 UK MNCs | 260 Bath Road Slough Berkshire SL1 4DX | 0113 272 2000 |
| Telemar (UK) Ltd | Telemar (UK) Ltd | 5 Tillingbourne Court, Dorking Business Park Station Road Dorking Surrey RH14 1HJ | 01306 883 355 |
| Telemark (UK) Ltd | Telemark (UK) Ltd | Carrton House 28-29 Western Road Hove, East Sussex BN3 1AF | 0870 759 3000 |
| Telemax Ltd | Telemaxx Ltd | 1st Floor Federation House 36-38 Rockingham Road Ketting Northampton NN16 8JS | 0870 7561411 |
| Telephone and Data (Billing) Services Ltd | Telephone and Data Services | 22 South Audley Street London W1K 2NY | 0870 787 0788 |
| Telephone Europe Ltd | Telephone Europe Ltd | Office 5 Vulcan House Business Centre Vulcan Road Solihull B91 2JY | 0870 300 686 |
| Telephone Maintenance Group Plc | TMG plc | Senate House, Saxon Business Park Stoke Prior Bromsgrove Worcs B60 4AD | 01527 881 800 |
| Telephone Monitoring Ltd | TML Telecom | Network House 197 Kirkham Road Preston PR4 1XB | 01772 631 333 |
| Telephone Tech Ltd | Telephone Tech Ltd | 290 Heysham Road Morecambe LA3 1PZ | 01524 853 737 |
| Telephonics Integrated Telephony Ltd | Telephonics | 514 Chester Road Birmingham B36 0LG | 0871 989 9982 |
| Telephony Management Ltd | |||
| Telephony Services Ltd | Telephony Services Ltd | 38 Tellcroft Close Corsham SN13 9JQ | 01225 800 810 |
| Teleproject UK Ltd | Teleproject UK Ltd | Business & Technology Centre Bessemer Drive Stevenage Hertfordshire SG1 2DX | 0844 556 4757 |
| Telequip Ltd | Globecom Ltd | 2 Acorn Business Park Northarbour Road Cosham Hants PO6 3TH | 0845 620 1 620 |
| Telequip Ltd | Multicom Connect Ltd | Acorn Business Park Northarbour Road Cosham Hants PO6 3TH | 0870 777 0 777 |
| Telequip Ltd | Norcom UK Ltd | Acorn Business Park Northarbour Road Cosham Hants PO6 3TH | 0870 777 0 777 |
| Telequip Ltd | Splash Telecom | Acorn Business Park Northarbour Road Cosham Hants PO6 3TH | 0870 777 0 777 |
| Telequip Ltd | Telequip Ltd | 5 Acorn Business Park Northarbour Road Cosham, Hants PO6 3TH | 0870 777 0777 |
| Telesis Communications Ltd | Telesis Communications Ltd | 15 Bishops Grange Rugeley Staffordshire WS15 3JY | 0800 012 6336 |
| TeleWare PLC | TeleWare Hosted Services Ltd | TeleWare Group PLC TeleWare House York Road Thirsk, North Yorkshire YO7 3BX | 01845 521193 |
| TeleWare PLC | TT-Office Ltd | TeleWare Group PLC TeleWare House York Road Thirsk, North Yorkshire YO7 3BX | 01845 521193 |
| Telewest Communications Group Ltd | Telewest Communications | Peterborough Beechcroft Southgate Park Bakewell Road Orton Southgate, Peterborough PE2 6YS | 0800 953 2222 |
| Teliasonera International Carrier UK Ltd | |||
| Telinet Solutions Ltd | Telinet Solutions Ltd | Telinet House 52 Southwark Bridge Road London SE1 0AR | 0800 652 1001 |
| Telkom Celular Services Ltd | Telkom | BBIC Building Snydale Road Choworth, Barnsley S72 8RP | 01226 718 193 |
| Telnet International Ltd | Telnet International Ltd | Golf House Horsham Road Pease Pottage West Sussex RH11 9SG | 0870 770 7790 |
| TelNG Ltd | TelNG Ltd | 203 Marsh Wall London E14 9YT | 020 8114 5000 |
| Telsave Ltd | |||
| TELSTRA EUROPE Ltd | Telstra | Customer Services, Telstra Europe Ltd Level 7 3 Finsbury Square London EC2A 1AE | 020 7965 0000 |
| TELSTRA EUROPE Ltd | Telstra Affinity 1 | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra Affinity 2 | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra Affinity 3 | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra Direct Channel | Customer Services, Telstra House Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra Partner Channel | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra Retail | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra SP Channel | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| TELSTRA EUROPE Ltd | Telstra Wholesale | Customer Services Telstra House, 21 Tabernacle Street London EC2A 4DE | 0800 856 6000 |
| Tesco Stores Ltd | Tesco Home Phone | P.O. Box 5879 Forres IV36 2YF | 0800 068 0818 |
| TET IP Ltd | TET IP Ltd | Laser House 132 Goswell Road London EC1V 7DY | 020 7553 9951 |
| The Airtime Group Ltd | |||
| The Carphone Warehouse Ltd | Sainsburys Homephone | 1 Portal Way London W3 6RS | 0870 990 9685 |
| The Carphone Warehouse Ltd | TalkTalk (The Carphone Warehouse) | TalkTalk Telecom Ltd 1 Portal Way London W3 6RS | 0870 990 9685 |
| The Complete Solution Company Ltd | Peoplesfone | Alexander House Moss Road Stretford Manchester M32 0WH | 08443 442 441 |
| The Mobile Point Ltd | The One Point Group | 189-197 Wincolmlee Hull East Yorkshire HU2 0PA | 01482 420170 |
| The Old Tack Room | Initsys Ltd | Home Farm House School Lane Normanton Le Heath LE67 2TH | 0845 330 1445 |
| The Orb Group Ltd | Orb | Orb House Cuckoo Wharf 435 Lichfield Road Birmingham B6 7SS | 0845 4080088 |
| The Phone Company | Celltone Communications Ltd T/A The Phone Co | 10 Wate Lane Bishops Stortford Herts CM23 2JZ | 01279 659 999 |
| The Phone Co-op | The Phone Co-op | 5 The Millhouse, Elmsfield Business Park Worcester Road Chipping Norton Oxon OX7 5XL | 0845 458 9000 |
| The Phone Guys Ltd | The phone guys ltd | Garrick House Glinton Peterborough PE6 7JP | 0808 168 1680 |
| The Phone Works | The Phone Works | Holy Oak Farm Upson Snodsbury Worcester WR7 4NH | 01905 381188 |
| The Team Group of Companies UK Ltd | The Team Group of Companies UK Ltd | 2 Hyde House Victoria Avenue Harrogate, North Yorkshire HG1 1DX | 0845 126 1621 |
| The Technologies Group Ltd | The Technologies Group Ltd | Equis House 4 Eastern Way Bury St Edmunds Suffolk IP32 7AB | 01284 778737 |
| The Telecoms Audit Bureau Ltd | The Telecoms Audit Bureau Ltd | Westwood House 78 Loughborough Road Quorn Leicestershire LE12 8DX | 0871 426 6976 |
| The Telecoms Group Ltd | |||
| The Voice(GB) Ltd | The Voice | Branwell House Park Lane Keighly W Yorks BD21 4QX | 0870 777 2407 |
| The Word Direct Ltd. | theWord. | 1 Denvale Trade Park Gladames Place Cardiff CF24 5AA | 02920 445 747 |
| Thompsons Alarms | Thompson Alarms and Communications Ltd | Unit 12 Portland Ind. Est. Stevenston Ayrshire KA20 3NN | 01294 466060 |
| Thornford Communications Ltd | Thornford Communications Ltd | The Carthouse Hinton Business Park Tarrant Hinton Dorset DT11 8LN | 0844 7708282 |
| Threecom | Threecom Communications | 23c Parkstone Road Poole Dorset BH15 2NN | 08707 501612 |
| Threesixty Telecom Ltd | 360talk | 1010 Cambourne Business Park Cambourne Cambridge CB3 6DP | 08000 744 360 |
| Threesixty Telecom Ltd | 360telecom ltd | 1010 Cambourne Business Park Cambourne Cambridge CB3 6DP | 08000 744 360 |
| Threesixty Telecom Ltd | talk threesixty | 1010 Cambourne Business Park Cambourne Cambridge CB3 6DP | 08000 744 360 |
| Threesixty Telecom Ltd | talk360 | 1010 Cambourne Business Park Cambourne Cambridge CB3 6DP | 08000 744 360 |
| Threesixty Telecom Ltd | threesixty talk | 1010 Cambourne Business Park Cambourne Cambridge CB3 6DP | 08000 744 360 |
| Threesixty Telecom Ltd | threesixty telecom ltd | 1010 Cambourne Business Park Cambourne Cambridge CB3 6DP | 08000 744 360 |
| Thus Plc | Demon Voice | Demon Solutions 1/2 Berkeley Square 99 Berkeley Street Glasgow G3 7HR | 0800 027 7485 |
| Thus Plc | Thus Open Access | Thus PLC 1/2 Berkeley Square 99 Berkeley Street Glasgow G3 7HR | 0141 567 1234 |
| Tier One Solutions Ltd | Tier One Solutions Ltd | 47 Park Road North Urmston Manchester M41 5AT | 07887 867 569 |
| Timico Ltd | |||
| Tiscali UK Ltd | Smart Talk | P.O. Box 7206 Milton Keynes MK14 6KG | 0870 741 5000 |
| Titan Technology Ltd | |||
| Titan Telecom Ltd | Titan Telecom Ltd | Po Box 257 Manchester M22 4ZF | 0844 257 0844 |
| T-Liaison Communications Ltd | |||
| TM Solutions Ltd | TM Solutions Ltd | ||
| TMG Network Services Ltd | 98-100 Ock Street Abingdon, Oxford OX14 5DH | 0870 066 0801 | |
| Today's Northern Ireland LTD | |||
| Together Telecoms Ltd | Together Telecoms Ltd | 23 Baseline Whitchurch Road London W11 4AT | 020 7193 2134 |
| Topland Communications Ltd | Topland Communications Ltd | Unit 4a Top Land Country Business Park Cragg Road Mytholmroyd West Yorkshire HX7 5RW | 01422 888500 |
| Total Communications (Northern) Ltd | |||
| Total Telecommunications Ltd | Total Telecommunications Ltd | Telecoms House 296 High Street Cheltenham Glos GL50 3HQ | 01242 246702 |
| Touch Europe Ltd | Touch Europe Ltd | Benitma House 168-172 Old Street London EC1V 9BP | 0800 083 9894 |
| Touch Intelligence Ltd | Touch Intelligence Ltd | 4 Summerhill Road Dartford Kent DA1 2LP | 01322 278 855 |
| Touch Telecom Ltd | Touch Telecom Ltd | 6th Floor 8 Exchange Quay Salford Manchester M5 3EJ | 0161 932 1176 |
| Touchbase Conexion | Touchbase Conexion | 137-144 High Holborn LONDON WC1V 6PL | 0207 8787 000 |
| Towers Telecom | 118CAN | 5 Towers Court Duckworth Street Blackburn Lancashire BB2 2JQ | 01254 675079 |
| Townley Communications plc | Townley Communications plc | The Pavilions Chester Business Park Chester CH4 9QH | 01244 659 659 |
| Transaction Network Services (UK) Ltd | Transaction Network Services (UK) Ltd | Marketing Department Sheffield Business Park Europa link Sheffield S9 1XU | 0114 292 0200 |
| Transcat Telecom Ltd | Transact Telecom | Station Court Station Road Great Shelford Cambridge CB22 5NE | 01223 551 000 |
| Transglobal Europe Ltd | |||
| Transglobal Telecommunications | Transglobal Telecommunications | 65 College Road Maidstone Kent ME15 6SX | 01622 774 900 |
| Transglobal UK Ltd | Transglobal UK Ltd | The Communications Centre 65 College Road Maidstone KENT ME15 6SX | 01622 774 900 |
| Trevor Crossland Communications Ltd | Trevor Crossland Communications Ltd | D105 Dean Clough Halifax W Yorkshire HX3 5AX | 0870 870 2777 |
| Trinity Telecom | |||
| Tripudio Ltd | Tripudio call Centre Services | Shawfield House Shawfield Lane Ash Surrey GU12 6QZ | 0845 0852947 |
| Trojan Communications Ltd | Trojan Communications Ltd | Roots House 2-4 Bilton Industrial Estate Humber Avenue Coventry CV3 1JL | 02476 651 080 |
| Trophy Telecom Ltd | Trophy Telecom | 4 Great Courtlands Langton Green Tunbridge Wells Kent TN3 0AH | 0844 251 1600 |
| True Communications Ltd | |||
| True Telecom Ltd | |||
| Trustel (NI) Ltd | |||
| Trustel (UK) Ltd | |||
| TSC Associates Ltd | TSC Associates Ltd | 11 Browns Coppice Avenue Solihull West Midlands B91 1PL | 0121 703 3502 |
| Tspeak (UK) Ltd | Tspeak | High Corn Mill Chapel Hill Skipton BD23 7NL | 0870 126 5333 |
| TTC Communications Ltd | TNET | Linton House 164-180 Union Street London SE1 0LH | 020 7771 7800 |
| TTG (Southern) Ltd | TTG (Southern) Ltd | Broadway House 21 Broadway Maidenhead SL6 1NU | 0870 067 1650 |
| TTG (UK) Ltd | TTG (UK)Ltd | Riverside Harley House Mill Fold Ripponden HX6 4DJ | 01422 410 520 |
| Turnkey Telecom Solutions Ltd | Turnkey Telecom Solutions Ltd | 1 George Williams Way Colchester Essex CO1 2JS | 01206 760505 |
| Twang.net Ltd | Twang.net Ltd | Furlong House Hambridge Road Newbury Berkshire RG14 5UT | 01635 239 000 |
| Twisted Fish Ltd | Twisted Fish | 63 Kew Green Richmond London TW9 3AH | 020 8973 2272 |
| TwistedPair Ltd | TwistedPair Ltd | Collyers Stable Ridge Common Lane Petersfield GU32 1AQ | 0870 163 6999 |
| TWL Europe | TWL Europe | Dean Park House 8-10 Dean Park Crescent Bournemouth BH1 1HP | 020 3002 2288 |
| TWL Inbound Ltd | TWL Inbound Ltd | 2nd Floor Dean Park House Dean Park Crecent Bournemouth BH1 1HP | 0800 088 7420 |
| TWS Global Ltd | |||
| TXU Europe | |||
| TXU UK Ltd | |||
| U Talk Ltd | |||
| UA International Ltd | |||
| Ucall Ltd | UCALL | 10 Blacksmiths Lane Hockley heath Solihull West Midlands B94 6QP | 0121 603 8258 |
| UCB Connect Ltd | UCB Connect Ltd | Moles Hall Nursery Drive Braintree, Essex CM7 9RY | 0870 160 9001 |
| UK Communications Ltd | |||
| UK Corporate Telecom Ltd | corTel | Qwerty House 9 Stalmine Avenue Heald Green SK8 3JG | 0845 124 9001 |
| UK Data IT Ltd | UK Data IT Ltd | 6th Floor, Elgar House Shrub Hill Road Worcester WR4 9EE | 0870 066 0771 |
| UK Digital Networks Ltd | |||
| UK Freephone Ltd | UK Freephone Ltd | P.O. Box 800 South Ockendon RM15 4WH | 0800 074 7070 |
| UK ICT Solutions | UK ICT Solutions | 2 Sextons Lodge Hard Lane St Helens Merseyside WA10 6JT | 01744 301100 |
| UK Talk Telecoms Ltd | UK Talk Telecoms | 13 Timplings Row Hemel Hempstead Hertfordshire HP1 3ET | 07824 998843 |
| UK Tech Services Ltd | UK Tech Services Ltd | 46 Seaton Road Hemel Hempstead Herts HP3 9HT | 01442 500 024 |
| UK Telecom | UK Telecom | Media House Lansbury Estate Knaphill Woking GU21 2EP | 01483 485070 |
| UK Voice Ltd | UK Voice Ltd | European Communication Centre Flag Business Centre Vicarage Farm Road Peterborough PE1 5TX | 0870 8922 111 |
| UK Wholesale Direct | Lotus Telecom | 4th Floor Meadow Mill Water Street Stockport SK1 2BU | 0161 660 0986 |
| UK Wholesale Direct | UK Wholesale Direct | 4th Floor Meadow Mill Water Street Stockport SK1 2BU | 0161 660 0986 |
| UK_Telco (GB) Ltd | |||
| UK2Telecom Ltd | |||
| Ultimate Networks Ltd | Ultimate Networks Ltd | Rudgate Thorpe Arch Wetherby West Yorkshire LS23 7RR | 0870 112 2221 |
| UniCall Telecommunications Ltd | UniCall Telecommunications | 12 Trinity Crescent London SW17 7AE | 0800 197 1700 |
| Unicorn Telecommunications Ltd | |||
| Unifi Communications Ltd | Unifi Communications Ltd | 68 Stanley Road Teddington Middlesex TW11 8TX | 0208 943 9333 |
| Unified Business Systems | Unified Business Solutions | Huntingdon House 278-290 Huntingdon Street Nottingham NG1 3LY | 0115 9419500 |
| UniOne Ltd | Charity Telecom | 7 Tottenham Mews London W1T 4AB | 020 7580 1199 |
| United Connect Ltd | United Connect Ltd | 25-27 Thames Street Hampton TW12 2EW | 020 8408 8888 |
| United Mobile Services Ltd | United Mobile | United Mobile Services Ltd 45-47 Station Road Gerrards Cross Buckinghamshire SL9 8ES | 01754 65504 |
| United Utilities Customer Sales Ltd | |||
| United Worldwide Telecom Ltd | United Worldwide Telecom Ltd | Suite 3 Wilmslow House Grove Way, off Water Lane Wilmslow, Cheshire SK9 5AG | 0870 750 0320 |
| Unitel Network Services Ltd | |||
| Unity Broadband Ltd | Unity Broadband | Customer Services Baspoint Business Centre Metcalf Way Crawley RH11 7XX | 01293 763 022 |
| UniverCell (UK) | UniverCell | 137 Brent Street Hendon London NW4 2HG | 0870 950 6005 |
| Universal Group Networks Ltd | Universal Group Networks Ltd | The Old Coach House 67b High Street Saffron Walden Essex CB10 1AA | 0870 160 3333 |
| Universal Office Automation (Networks) Ltd | Universal | 18 Hartham Lane Hertford Herts SG14 1QN | 01992 821 212 |
| Universal Savings Ltd | Universal Savings Ltd | Provincial House 3 High Street Ryde PO33 2PN | 08450 50 48 10 |
| Universal Telecom | Universal Telecom | A Product of Timepiece, Lda City Point 1 Ropemaker Street London EC2Y 9HT | 0800 279 9809 |
| Universal Telecom Ltd | |||
| Universal Telecoms Ltd | Universal Telecoms Ltd | Unit 11, The Glade Business Centre Eastern Avenue, Motherwell Way West Thurrock Essex RM20 3FH | 01708 899 442 |
| Universal Utilities T/A Unicom | Unicom | Longley House Longley Lane Manchester M22 4SY | 0161 946 4440 |
| Uniworld Bureau Services | Uniworld Bureau Services | Waterside House Haslar Marine Technology Park Gosport PO12 2AU | 0845 458 4510 |
| Uniworld Communications | Rycom | Waterside House Haslar Marine Technology Park Gosport PO12 2AU | 0845 658 1638 |
| Uniworld Communications | Uniworld Communications Ltd | Waterside House Haslar Marine Technology Park Gosport PO12 2AU | 0845 458 4510 |
| Uno Telecom Ltd | Uno Telecom Ltd | 375 Meanwood Road Leeds LS7 2LL | 0113 2441 442 |
| Unofon Telecom Ltd | E - Telecom | Sir Walter Raleigh House 48-50 Esplanade St Helier Jersey JE3 3QB | 0800 652 4894 |
| Unofon Telecom Ltd | FSB Telecom | Sir Walter Raleigh House 48-50 Esplanade St Helier Jersey JE3 3QB | 0800 652 5095 |
| Unofon Telecom Ltd | Glow Telecom | Sir Walter Raleigh House 48-50 Esplanade St Helier Jersey JE3 3QB | 0800 652 8492 |
| Usave Telecom | Usave Telecom | Goodyear Business Park New Street Mawdesley L40 2QP | 01704 822522 |
| U-Select Services Ltd | You Telecoms | Jesson House Tower Street Coventry CV1 1JN | 0845 330 2553 |
| USP (GB) Ltd | USP (GB) Ltd | 2 The Cobalt Centre Siskin Parkway East Coventry CV3 4PE | 02476 620 020 |
| UT Networks Ltd | UT Networks Ltd | Barham Court Teston Maidstone KENT ME18 5BZ | 0845 408 1002 |
| Utilitel Ltd | Utilitel Ltd | t/a Yourtel Quays Reach Business Quarter Carolina Way Salford, Manchester M50 2ZY | 0845 225 6006 |
| Utilities Network Ltd t/a Pennycom Communications | Pennycom Communications | 26-27 Downing Street Farnham Surrey GU9 7PD | 0870 2000 121 |
| Utilities UK Ltd | Directsave Telecom | Hartcran House Gibbs Couch Carpenders Park Hertfordshire WD19 5EZ | 0870 050 0601 |
| Utility Auditing Ltd | |||
| Utility Forum | Utility Forum | 148 Victoria Road West Cleveleys Lancashire FY5 3NE | 01253 851818 |
| Utility Options Ltd | Utility Options Telecom | Gateway House 78 Northgate Street Chester CH1 2HR | 0800 195 0123 |
| Utility Solutions (UK) Ltd T/A First Option Telecom | First Option Telecom | 69 Primrose Hill Kings Langley Herts WD4 8HX | 0871 4900 105 |
| UTV Internet | UTV Internet Ltd | Ormeau Road Belfast, Co. Antrim BT7 1EB | 0845 247 0000 |
| V & J Harbour Ltd | UNITY | 9 Fishers Industrial Estate Wiggenhall Road Watford Herts WD18 0FN | 01923 233277 |
| V Networks Ltd | V Networks Ltd | Amadeus House Floral Street Covent Garden London WC2E 9DP | 08000 828 900 |
| V10 Media Ltd | Blubba | 44 Parkhouse Court Hatfield Hertfordshire AL10 9QZ | 01707 272 422 |
| V10 Media Ltd | V10 Media | 44 Parkhouse Court Hatfield Hertfordshire AL10 9QZ | 01707 272 422 |
| V12 Telecom Ltd | V12 Telecom Ltd | 1 Stanton Court South Marston Park Swindon CN3 4YH | 0870 190 0077 |
| V4 Ltd | V4 | Altec House 27 Aintree Road Perivale Middlesex UB6 7LA | 0845 034 3910 |
| Vaioni Group Ltd | Clear Voice | 14 Leslie Hough Way Manchester M6 6AJ | 0870 160 0650 |
| Vale DS Communications Ltd | Vale DS Communications Ltd | 333 Connaught Road Brookwood Woking Surrey GU24 0AD | 020 3388 8888 |
| Valley Enterprises Ltd | Valley Telecoms | Cloverfield Horsebridge Road Kings Somborne Hampshire SO20 6PT | 0845 0091810 |
| Value Telecom | |||
| Vanco UK Ltd | Vanco UK Ltd | John Busch House 277 London Road Isleworth Middlesex TW7 5AX | 0208 636 1700 |
| Vandercom Ltd | Vandercom | Unit C Petherton House 27-29 Petherton Road London N5 2QZ | 020 3302 8189 |
| Vantage Communications Ltd | Vantage Communications Ltd | The Stable's 74 Harestone Hill Caterham Surrey CR3 6DH | 0845 375 1573 |
| VarTec Telecom (UK) Ltd | VarTec Telecom Europe Ltd | No1 Greyfriars Belgrave House Northampton NN1 2TT | 01604 548000 |
| VC World Ltd | |||
| Vebra Solutions T/A Thinkproperty.com | Thinkproperty.com | 950 Capability Green Luton Bedfordshire LU1 3LU | 01582 465 328 |
| Vectone Network Ltd | Vectone Network Ltd | 58 Marsh Wall London E14 9TP | 020 7170 0400 |
| Velofone Ltd | Velofone Ltd | Evolve Telecommunications Ltd Gibraltar House 539-541 London Road, Westcliff-on-sea, Essex SS0 9LJ | 0870 333 2590 |
| VEN Systems Ltd | VEN Systems | 30 Willow Street London EC2A 4BH | 0845 45 05 836 |
| Venture Telecom Ltd | Venture Telecom Ltd | Barham Court Teston Maidstone KENT ME18 5BZ | 0845 241 0255 |
| Vepco Ltd | Vepco Ltd | Hob Hall Holme Chapel Cliviger Lancashire BB10 4SU | 0845 864 5005 |
| Verizon UK Ltd | Verizon Business | Reading International Business Park Reading RG2 6DA | 0870 870 4334 |
| Versacom Solutions Ltd | Versacom | Kings House 13/14 Orchard Street Bristol BS1 5EH | 0844 8243345 |
| Vertical Systems Ltd | Vertical Systems | 14 Hemmells Laindon Basildon Essex SS15 6ED | 07703 502053 |
| Verve Commercial Enterprise Solutions Ltd | Verve Commercial Enterprise Solutions | St James Place 23a Princes Road Brunton Park Newcastle Upon Tyne NE3 5TT | 07729 453 521 |
| Vesuvius Communication Technologies Ltd | Vesuvius Intelligent Telephony | Parkfield House Park Street Stafford ST17 4AL | 08708 900 150 |
| Vibe Active Communications Ltd | |||
| Vibe Communications Uk Ltd | VIBE | Langtye Business Centre Langtye Lane Ripe East Sussex BN8 6AY | 0845 610 6456 |
| Video Networks Ltd | |||
| Vineside Ltd | Vineside | Milngavie Enterprise Centre Ellangowan Court Glasgow G62 8PH | 0141 943 1943 |
| Virgin Business Solutions Ltd | virgin business solutions | 6 Half Moon Street Mayfair London W1J 7BA | 0845 855 0895 |
| Virgin Media Ltd | Virgin Media | ntl Group Ltd Bartley Wood Business Park Bartley Way Hook, Hampshire RG27 9UP | 01256 752 000 |
| Virgin Media Ltd | |||
| Virocom Ltd | |||
| Virtual Carrier Ltd | |||
| Virtual Communications Ltd | Telecommunications | 33 Minden Place Hemswell Cliff Gainsborough DN21 5XN | 01427 667275 |
| Virtual IT Ltd | Virtual IT | 18C Pindock Mews London W9 2PY | 020 7286 9500 |
| Virtual Logistics Ltd | |||
| Virtual Private Networks Ltd | Virtual Private Networks | Network House 1 The Close Hillingdon Uxbridge, Middlesex UB10 0BP | 08709 307780 |
| Virtual Telecom Ltd | Virtual Telecom Ltd | 95 Manchester Road Rochdale, Lancashire OL11 4JG | 0870 906 0066 |
| Visology Ltd | Visology Ltd | 7 Saxifrage Drive Stone ST15 6XY | 01785 286 553 |
| Vispa Internet Ltd | Vispa/Vispa Internet Ltd | The Courtyard 160a Moss Lane Altrincham Cheshire WA15 8AU | 0161 9268416 |
| Vital International Group Ltd | Vital International | Matrix 11 900 Coronation Road Park Royal London NW10 7PH | 0870 005 6440 |
| Vital Phone Ltd | Vital Telephone | 120 Moorgate London EC2M 6SS | 0870 121 1190 |
| Vitality Consulting Services Ltd | Vitality Communications | 1010 Cambourne Business Park Cambridge CB23 6DP | 01223 597 848 |
| Vital-Link Communications Ltd | Vital-Link Communications | 82A Mountgrove Road London N5 2LT | 020 7704 2591 |
| Vitel Halifax Ltd | Vitel Halifax Ltd | Clifton House Clifton Mills Bailiff Bridge Brighouse HD6 4JJ | 01484 381 490 |
| VividSky Ltd | VividSky Ltd | Park Place 12 Lawn Lane London SW8 1UD | 020 7091 2950 |
| Vodacom Ltd | Vodacom Ltd | Suites 7 & 8 59 High Street Sittingbourne Kent ME10 4AW | 08456 528728 |
| Vodafone Corporate Ltd | |||
| Vodafone Ltd | Vodafone Ltd | Brunel Park Brunel Drive NewaRk Notts NG24 2EG | 0870 4036 500 |
| Vodat International Ltd | Vodat International Ltd | Unit A9 Pearmill Estate Stockport Road West Bredbury Stockport SK6 2BP | 0161 406 1820 |
| VOICE | VOICE | 44 Largy Road Crumlin Co Antrim BT29 4RN | 02984 420 500 |
| Voice 2 Voice Ltd | Voice 2 Voice Ltd | Ground Floor, Victory Point Nelson Court Staffordshire Technology Park Stafford ST18 0WQ | 0845 241 8399 |
| Voice 4 Data Ltd | Voice 4 Data Ltd | Communications House 95 Boston Road Leicester LE4 1AW | 0870 165 0005 |
| Voice Connect (SW) Ltd | Voice Connect (SW) Ltd | The Manse Fore Street Othery, Somerset TA2 0QH | 0845 120 4445 |
| Voice Dat Ltd | Simple | Unit 6 Fort Dunlop Fort Parkway Birmingham B24 9FD | 0121 748 8484 |
| Voice Data Network Ltd | BT Voice Services Ltd | 2-8 Park Road Lytham St. Annes Lancashire FY8 1QX | 01253 783 990 |
| Voice over IP Ltd | Voice over IP Ltd | Skyways Business Park Fair Oak Close Exeter Devon EX5 2UL | 01392 445 566 |
| Voice41P Ltd | Voice4IP Ltd | 30 Modwen Road Salford Manchester M5 3EZ | 0161 908 0506 |
| Voicecom Networks Ltd | Voicecom Networks Ltd | Voicecom Buildings Wych Cross East Sussex RH18 5JL | 0870 770 0888 |
| VoiceNet Ltd | VoiceNet | Grosvenor House 1 High Street Edgeware, Middlesex HA8 7TA | 020 8952 9570 |
| Voiceworks Ltd | BXP | 15 Highgate Edge Great North Road London N2 0NT | 0845 241 1414 |
| VOIP Global Solutions Ltd | VOIP Telecom | No 1 Olympic Way Wembley Middlesex HA9 0NP | 020 8434 0590 |
| Voipshare Ltd | Calling Places | 12 Ashbourne Road Ealing London W5 3ED | 020 8810 6609 |
| VoIP-Un Ltd | VoIp-Un Ltd | European House Bournemouth International Airport Christchurch Dorset BH23 6EA | 0870 034 2000 |
| Voltage Telecom UK Ltd | Blitz Telecom | No 22 1st Floor Newman Street London N11 1RA | 020 7863 4000 |
| Vonage Ltd | Vonage | Queens Wharf Queen Caroline Street London W6 9RJ | 020 7993 2756 |
| Vortech Ltd | Vortech Ltd | Fetcham Park House Lower Road Leatherhead Surrey KT22 9HD | 01372 371177 |
| Voxalis Ltd | Voxalis Ltd | 4th Floor Harling House 47-51 Great Suffolk Street London SE1 0BS | 020 7078 3200 |
| VoxDev Ltd | VoxDev Ltd | Unit 16, Inex Business Park Abbey Road, Pity Me Durham County Durham DH1 2YJ | 08719 830 856 |
| VSL Networks Ltd | VSL Networks | Unit 6, Martinfield Welwyn Garden City Herts AL7 1HG | 0870 224 1717 |
| VX Telecom Ltd | VX Telecom | 204-226 Imperial Drive Rayners Lane Harrow Middlesex HA2 7HH | 020 8429 8552 |
| Wanstor Ltd | Wanstor Ltd | 242 Vauxhall Bridge Rd London SW1V 1AU | 020 7592 7860 |
| Wave Call Management Ltd | Wave Call Management Ltd | Solutions House 64 Chorley Road Swinton Manchester M27 5AD | 0161 794 2000 |
| Wavecrest (UK) Ltd | gotalk | 3rd Floor The Argyle Centre York Street Ramsgate, kent CT11 9DS | 0800 097 7777 |
| Waveeasy Ltd | |||
| Welcome Telecom Ltd | Welcome Telecom Ltd | G4 The Old Convent Beeches Green Stroud, Gloucestershire GL5 4AD | 0870 777 7011 |
| West Wales Telecom | West Wales Telecom | Camrose Lass Portfield Gate Haverfordwest SA62 3LS | 0800 097 9899 |
| Westcomm Ltd | |||
| Weston Communications Ltd | Weston Communications Ltd | Network House Whitehall Industrial Estate Whitehall Road Leeds LS12 5JB | 0113 389 0800 |
| White Horse Telecom Ltd | White Horse Telecom Ltd | The Old Stables Well Street Burghclere Newbury, Berkshire RG20 9ND | 0845 367 1144 |
| White Mist Enterprises Ltd | White Mist Enterprises Ltd | 1589 London Road Leigh-on-Sea Essex SS9 2SG | 08450 522 215 |
| White Rose Network Solutions Ltd | White Rose Network Solutions Ltd | 3 Cook Close Brompton on Swale Richmond DL10 7TY | 08008 778810 |
| Whitecubitt Communications Ltd | Whitecubitt Communications Ltd | Siddeley House 50 Canbury Park Road Kingston Upon Thames KT2 6LX | 020 3388 8000 |
| Whitemist | Whitemist | 122 Hamlet court Road Westcliff-on-Sea Essex SO0 7LP | 01978 858541 |
| Whiteqube Ltd | Whiteqube | Wessex House Oxford Road Newbury Berkshire RG14 1PA | 01635 814 466 |
| Widewell Communications | Widewell Communications | 49 Lulworth Drive Plymouth PL6 7DT | 01752 721 226 |
| Wight Cable 2005 Ltd | White Cable Island | 56 Love Lane Cowes PO31 7EU | 01983-242424 |
| Wight Cable 2005 Ltd | Wight Cable National | 56 Love Lane Cowes Isle of Wight PO31 7EU | 01983-242424 |
| Wightcable North Ltd | Nightcable North Ltd | 3 Chalmers Place Riverside Business Park Irvine, North Aryshire KA11 5DE | 0800 070 6150 |
| Windsor Telecom Plc | Windsor Telecom Plc | First Floor 4 Downing Street Farnham Surrey GU9 7NX | 0845 1304000 |
| Wired Up Communications | Wired and Connected | 25 Hatton Gardens Nuthall Nottingham NG16 1QT | 0845 845 0001 |
| Wirefast Ltd | WIREFAST | Willow House 17-23 Willow Place LONDON SW1P 1JH | 020 7592 1314 |
| Wireless Telecommunications Ltd | Wireless Telecommunications Ltd | 6 Commerce Way Whitehall Ind Est Colchester CO2 8HN | 01206 870 565 |
| Wisdom Telecom Ltd | |||
| Wish Solutions (GB) Ltd | Wish Solutions | Unit 7a Burcote Wood Business Park Wood Burcote Towcester Northants NN12 8TA | 01327 359111 |
| Wish Solutions Ltd | Wish Solutions Ltd | Unit 7a Burcote Wood Farm Business Park Wood Burcote Towcester Northamptionshire NN12 8TA | 0845 678 8848 |
| WN1 Ltd t/a WN1 Communications | WN1 Communications | Centre for Trade and Technology Waterside Drive Wigan WN3 4BA | 0870 0664460 |
| Woodcote Telecom | Woodcote telecom | Electra House Electra Way Crewe Business Park Crewe CW1 6WZ | 0870 300 6767 |
| Woodford Computers Ltd | Woodford Computers Ltd | Essex Technology & Innovation Centre The Gables Fyfield Road Ongar, Essex CM5 0GA | 01277 368214 |
| Worksmart Technology Ltd | |||
| WorkSpace Solutions | FirstCity Telecom | Suite 305 The Citadel Business Centre Bath Road Chippenham Wiltshire SN15 2AB | 01249 848 165 |
| World Connect Ltd | World Connect Ltd | Aizlewoods Mill Nusery Street Sheffield S3 8GG | 0800 092 5522 |
| WorldCom Net Ltd | WorldCom Net Ltd | 88 Kingsway Holborn London WC2 6AA | 0845 070 4520 |
| Worldnet Global Communications Ltd | WNET | Unit 8, Liberty Centre Mount Pleasant Wembley Middlesex HA0 1TX | 020 8795 5588 |
| Worldnet Global Communications Ltd | WORLDNET | WORLDNET HOUSE UNIT 8, LIBERTY CENTRE MOUNT PLEASANT WEMBLEY HA0 1TX | 0845 108 1000 |
| Worlds End Studios Ltd | Realisys Ltd | Worlds End Studios 132-134 Lots Road LONDON SW10 0RJ | 08454 567 019 |
| Worldwide Group | |||
| Worldwide ISDN Ltd | Worldwide ISDN Ltd | 8 Arrows Court Adams Way Springfield Business Park Alcester B49 6PU | 01789 766 811 |
| Worth Comms Ltd | Worth Comms Ltd | Branwell House Park Lane Keighley W Yorks BD21 4QX | 01535 691 507 |
| Wyre Communications | |||
| X Kommunications Ltd | X Komms | 268 Bath Road Slough SL1 4DX | 08454 58 58 10 |
| X2 Communications Ltd | X2 Communications Ltd | Unit 2, Moss Lane Business Centre Moss Lane Sandbach Cheshire CW11 3YX | 0845 688 3990 |
| Xi Communications Ltd | Xi Communications Ltd | Genesys House Sandbeck Way Wetherby LS22 7DN | 0330 333 9200 |
| Xinix Business Services Ltd | Xinix Business Services Ltd | 137 Powys Lane London N13 4HL | 08456 800007 / 020 8886 1758 |
| Xinix World | Xinix World | 303-304 Parma House Clarendon Road London N22 6UL | 020 8826 9500 |
| XL Networks Ltd | XL Networks Ltd | Unit 4 Priority Business Centre Curran Road Cardiff CF10 5ND | 0870 810 4242 |
| XLN Telecom | XLN and OneBill Telecom Ltd | 69 Bond Way London SW8 1SQ | 020 7793 5533 |
| Xoom Systems | Xoom Connect | 32 Porthall Place Brighton BN1 5PN | 01273 358132 |
| Xoom Systems | Xoom Talk | 32 Porthall Place Brighton BN1 5PN | 01273 358132 |
| XRL Communications Ltd | XRL Communications Ltd | XRC House Bradden Lane Gaddesden Row Hemel Hempstead, Hertfordshire HP2 6JB | 0870 404 4100 |
| Xtec Communications Ltd | Unicom | 32 St James's Street London E17 7PF | 020 8509 6201 |
| XTEL (UK) Ltd | XTEL (UK) Ltd | Headway Business Centre Knowles Lane Bradford West Yorkshire BD4 9SW | 0845 389 9066 |
| Xtel Communications (UK) Ltd | Xtel Communications (UK) Ltd | Headway Business Centre Knowles Lane Dudley Hill Bradford, West Yorkshire BD4 9SW | 0845 389 9066 |
| Xtel Europe Ltd | Xtel Europe Ltd | Independent House Imberhorne Lane East Grinstead West Susex RH19 1TU | 01342 335 000 |
| Yarm Computers Ltd | Synergy Telecoms | 149a High Street Yarm TS15 9AY | 0800 564 2800 |
| YCV Business Telecoms Ltd | YCV Business Telecoms | 172 Colchester Road Ipswich Suffolk IP4 4RS | 0800 862 0097 |
| Yello Communications | Yello communications | 23 Meadvale Road West Knighton Leicester LE2 3WN | 0116 2244 000 |
| Yellow Call Ltd | Yellow Call Ltd | Eventide Business Centre Valley Road, Harmans Cross Wareham Dorset BH20 5HU | 01929 480 444 |
| Yellowspring Plc | YSCOMMS | 1 Aurum Court Sylvan Way Laindon,Basildon Essex SS15 6TH | 01268 494 111 |
| Yes Talk Ltd | Yes Talk Ltd | 28 Alwin Road Rowley Regis B65 8BN | 0800 849 8500 / 0121 559 0005 |
| Yes Telecom | Yes Telecom | 308 Moseley Road Manchester M19 2LH | 01617 865 200 |
| Yorkshire Telecommunications Ltd | |||
| Your Call Ltd | GP Telecom Ltd. | 75-77 Drake Street Rochdale Lancashire OL16 1SB | 0845 345 6787 |
| Your Communications Ltd | |||
| Your Connection Ltd | Your Connection Ltd | 15 Manston Road Ramsgate KENT CT11 0RB | 08450 580 750 |
| Your Telecom Ltd | Your Telecom Ltd | Unit 8 Quays Reach Business Quarter Carolina Way Salford, Manchester M50 2ZY | 0870 442 2474 |
| YYC Networks Ltd | YYC Networks Ltd | 1 Molember Court Molember Road East Molesey Surrey KT8 9NF | 020 8398 9891 |
| Z1 Telecom Ltd | Z1 Telecom Ltd | Enterprise House 20 'b' Dale Road Marple Stockport, Cheshire SK6 6HA | 0870 050 8021 |
| Zamir Telecom Ltd | Telecom London Ltd | Unit 3.31, Whitechapel Technology Centre 75 Whitechapel Road London E1 1DU | 020 7096 1171 |
| Zefone Ltd | Zefone | 10 Hamilton Way Monmouth NP25 5BY | 0870 930 1090 |
| Zen Internet Ltd | Zen Internet | Moss Bridge Road Rochdale Lancashire OL16 5EA | 0845 058 9000 |
| Zencom Telecommunications Ltd | Zencom Telecommunications Ltd | 16 Hanover Square Mayfair London W1S 1HT | 0845 123 6900 |
| Zest4 Group Ltd | Zest4 | 8 Riverview The Embankment Vale Road Heatone Mersey, Stockport SK4 3GN | 0161 955 4745 |
| Zetnet Ltd | Zetnet Ltd | 23 New Mount Street Manchester M4 4DE | 0161 838 5208 |
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