• 3r Telecom
  28 Lindsey Street, EPPING, Essex, CM16 6RD
• 4d Interactive Ltd
  167-173 Wandsworth High Street, LONDON, Greater London, SW18 4JB
• 5th Avenue Telecom
  5 Arlington Parade, Brixton Hill, LONDON, Greater London, SW2 1RH
• A & R Telecom
  Unit 33 Drca Business Centre, Charlotte Despard Avenue, LONDON, Greater London, SW11 5HD
• A Novo
  Bilton Way, ENFIELD, Middlesex, EN3 7EP
• Aa Access Services Ltd
  Northumberland House 11 The Pavement Popes Lane, Ealing, LONDON, Greater London, W5 4NG
• Ace Telephones & Extensions
  27 Bradford Road, ILFORD, Essex, IG1 4AR
• Acl (Digital) Ltd
  Unit 20 City Business Centre, Lower Road, LONDON, Greater London, SE16 2XB
• Acropolis Capital Management Ltd
  73 Brook Street, LONDON, Greater London, W1K 4HX
• Act Teleconferencing Ltd
  Queens House, Kymberley Road, HARROW, Middlesex, HA1 1US
• Actix Ltd
  77 Fulham Palace Road, LONDON, Greater London, W6 8JA
• Advanced Telecom Networks Ltd
  531-533 High Road, WEMBLEY, Middlesex, HA0 2DJ
• Advanced Telecom Services UK Ltd
  Sekforde Court, 213 ST. John Street, LONDON, Greater London, EC1V 4LY
• Advantel Online
  27 Redan Place, LONDON, Greater London, W2 4SA
• Advitel Ltd
  Tan House, Tan House Lane, Navestockside, BRENTWOOD, Essex, CM14 5SN
• Aic Telecom UK Ltd
  12-13 Little Newport Street, LONDON, Greater London, WC2H 7JJ
• Alan Wright
  157 Park Avenue, ORPINGTON, Kent, BR6 9ED
• Alpha Prepaid Ltd
  391 Richmond Road, TWICKENHAM, Middlesex, TW1 2EF
• Alpha Telecom
  391 Richmond Road, TWICKENHAM, Middlesex, TW1 2EF
• Amateur Radio Communications Centre
  71 Brighton Road, SOUTH CROYDON, Surrey, CR2 6EE
• Amg Connect
  1 Canada Square, LONDON, Greater London, E14 5DY
• Ant Communications
  4 Front House, Stonefield Way, RUISLIP, Middlesex, HA4 0JS
• Arbinet-Thexchange Ltd
  12-18 Paul Street, LONDON, Greater London, EC2A 4JH
• Area Communications
  Reviens, The Rowans, SUNBURY ON THAMES, Middlesex, TW16 7QG
• Artel Scaffolding Ltd
  Fiboard House, Oakleigh Gardens, LONDON, Greater London, N20 9AB
• Austin Telecom
  10 Melton Place, EPSOM, Surrey, KT19 9EE
• Autoansa Ltd
  Swan House, 69-71 Windmill Road, SUNBURY ON THAMES, Middlesex, TW16 7DT
• Azarn Communications Ltd
  144-146 Buckingham Palace Road, LONDON, Greater London, SW1W 9TR
• B2bt For Business's In West London
  Studio 3.1, 114 Power Road, LONDON, Greater London, W4 5PY
• BT (Worldwide) Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Alder Two Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Cableships Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Centre Nominee 2 Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Communications Management Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Conferencing
  Ambassador House, 75 St Michaels Street, LONDON, Greater London, W2 1QS
• BT Eighty Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Equipment Finance Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT European Investments Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Fifty Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Fifty-One
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Fifty-Seven
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Fifty-Six
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Fleet Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Forty - Four
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Forty-Nine
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Garrick Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Global Services Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Group Nominees Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Infonet
  Heathcoat House, 20 Savile Row, LONDON, Greater London, W1S 3PR
• BT International Network Services Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Investment Capital GP Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT LGS Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Lease Holdings Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Local Business
  Western Road, ROMFORD, Essex, RM1 3LP
• BT Newgate Investments Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Nominees Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Nordics Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Payment Services Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Property Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Risk Management Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Seventy-Three
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Sixty-Seven Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Solutions Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Subsea Cables Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Switzerland Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Systems Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Telconsult Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• BT Uae Ltd
  BT Centre, 81 Newgate St, LONDON, Greater London, EC1A 7AJ
• Band-X
  Crown House, 51 Aldwych, LONDON, Greater London, WC2B 4AX
• Barking Consulting Ltd
  401 Langham House, 302-308 Regent Street, LONDON, Greater London, W1B 3HH
• Bee Gees
  338 Edgware Road, LONDON, Greater London, W2 1EA
• Berstream Ltd
  5 French Place, LONDON, Greater London, E1 6JB
• Betta Communications
  Trocoll House, Suite 110 Wakering Road, BARKING, Essex, IG11 8PD
• Biscit Telecommunications Ltd
  9 Hale Lane, LONDON, Greater London, NW7 3NU
• Bobe
  374 Caledonian Road, LONDON, Greater London, N1 1DY
• Breakthrough Global Ltd
  Marcar House, Parkshot, RICHMOND, Surrey, TW9 2RG
• Bubton Communications Ltd
  6 Beaufort Court, Admirals Way, LONDON, Greater London, E14 9XL
• Business Connect Ltd
  8 Spice Court, Ivory Square, LONDON, Greater London, SW11 3UE
• C E S Telecom
  15-17 Newgate Street Village, HERTFORD, Hertfordshire, SG13 8RA
• C F P Courier Services
  38 Skylines Village, Limeharbour, LONDON, Greater London, E14 9TS
• C N S
  Bradley House, ST. Albans Lane, LONDON, Greater London, NW11 7QE
• C P S Telecom
  Worthington House, 449-451 High Road, LONDON, Greater London, NW10 2JJ
• CCT Telecommunications Ltd
  6 Beaufort Court, Admirals Way, LONDON, Greater London, E14 9XL
• Cable & Wireless Access Ltd
  26 Red Lion Square, LONDON, Greater London, WC1R 4HQ
• Cable & Wireless Communications Ltd
  1 Brentside Exec Centre, Great West Road, BRENTFORD, Middlesex, TW8 9DS
• Cabletel (GB) Ltd
  Suite 112 Whittaker House, Whittaker Avenue, RICHMOND, Surrey, TW9 1EH
• Call Centre International
  1d Eldon Parade, Eldon Road, LONDON, Greater London, N22 5DU
• Call World
  106 Golders Green Road, LONDON, Greater London, NW11 8HB
• Calling Places Ltd
  12 Ashbourne Road, LONDON, Greater London, W5 3ED
• Callworld UK
  88 Uxendon Hill, WEMBLEY, Middlesex, HA9 9SJ
• Cannock Investments
  5 Lower Belgrave Street, LONDON, Greater London, SW1W 0NR
• Capital Communications
  1 Whites Row, LONDON, Greater London, E1 7NF
• Cellcast UK Ltd
  150 Great Portland Street, LONDON, Greater London, W1W 6QD
• Central Telecom
  28 King Street, LONDON, Greater London, EC2V 8EA
• Chitter Chatter Ltd
  358 Oxford Street, LONDON, Greater London, W1C 1JJ
• Cips
  9 Baring Road, LONDON, Greater London, SE12 0JP
• City Call
  ST. Martins House, 16 ST. Martin's Le Grand, LONDON, Greater London, EC1A 4EN
• City Call Centre
  148 High Street, LONDON, Greater London, NW10 4SP
• City Of London Telecommunications Ltd
  Beaufort House, 15 ST. Botolph Street, LONDON, Greater London, EC3A 7QN
• Click & Surf
  157-159 Cherry Orchard Road, CROYDON, Surrey, CR0 6BF
• Cohere
  10 Singleton Scarp, LONDON, Greater London, N12 7AR
• Colt Mobile Telecommunications Ltd
  Beaufort House, 15 ST. Botolph Street, LONDON, Greater London, EC3A 7QN
• Colt Telecommunications
  Beaufort House, 15 ST. Botolph Street, LONDON, Greater London, EC3A 7QN
• Columbus Telecom Ltd
  12 York Gate, LONDON, Greater London, NW1 4QS
• Commerce Telecom
  311 Blackfen Road, SIDCUP, Kent, DA15 9NG
• Commlinks
  96 Harlington Road West, FELTHAM, Middlesex, TW14 0JJ
• Commonwealth Telecommunications Organisation
  Clareville House, 26-27 Oxendon Street, LONDON, Greater London, SW1Y 4EL
• Communication 2000
  215 Edgware Road, LONDON, Greater London, NW9 6LP
• Communications Center Ltd
  39-41 High Street, LONDON, Greater London, E17 7AD
• Communications Network
  Green Street, SUNBURY ON THAMES, Middlesex, TW16 6QJ
• Communications World
  39-41 High Street, LONDON, Greater London, E17 7AD
• Community Care Management Services Ltd
  145 Cannon Street, LONDON, Greater London, EC4N 5BQ
• Compcom Ltd
  35 Thurloe Street, LONDON, Greater London, SW7 2LQ
• Comtel Telecommunications Ltd
  Park House, 158/160 Arthur Road, LONDON, Greater London, SW19 8AQ
• Corex Networks Ltd
  250 Gunnersbury Avenue, LONDON, Greater London, W4 5QB
• Coruscant International
  1 Chandos Road, BOREHAMWOOD, Hertfordshire, WD6 1UU
• Cospas-Sarsat Secretariat
  99 City Road, LONDON, Greater London, EC1Y 1AX
• Cramer
  3 Sheldon Square, LONDON, Greater London, W2 6HY
• Cramer Systems
  8 The Square, Stockley Park, UXBRIDGE, Middlesex, UB11 1FW
• Creative Audio-Visual Solutions Ltd
  Great North Road, Brookmans Park, HATFIELD, Hertfordshire, AL9 6NE
• Crystall Communications
  Unit 8 GRD, Centre Way Claverings Industrial Estate, LONDON, Greater London, N9 0AH
• Cybit Positioning Solutions Ltd
  Compass House, Davis Road, CHESSINGTON, Surrey, KT9 1TP
• Daleton Communications Ltd
  Suite 401 Langham House, 302-308 Regent Street, LONDON, Greater London, W1B 3HH
• Dartford Network Solutions
  175 Watling Street, DARTFORD, Kent, DA2 6GB
• Datasharp (South East) Ltd
  Riverside House, Southend Road, WOODFORD GREEN, Essex, IG8 8HQ
• Dejbunji Telecom
  432 Barking Road, LONDON, Greater London, E6 2SA
• Dial Abroad
  235 Baker Street, LONDON, Greater London, NW1 6XE
• Direct Save Telecom
  Hartcran House, Gibbs Couch, WATFORD, Hertfordshire, WD19 5EZ
• District Communications Ltd
  Unit 21 33 Rushworth Street, LONDON, Greater London, SE1 0RB
• Docomo Europe Ltd
  Landsdowne House, 57 Berkeley Square, LONDON, Greater London, W1J 6ER
• Door To Door Preference Service Ltd
  Dma House, 70 Margaret Street, LONDON, Greater London, W1W 8SS
• Doorstep Preference Service Ltd
  Dma House, 70 Margaret Street, LONDON, Greater London, W1W 8SS
• E-Learning Guru Publications Ltd
  401 Langham House, 302-308 Regent Street, LONDON, Greater London, W1B 3HH
• E.C Datacoms
  Linburn House, 342 Kilburn High Road, LONDON, Greater London, NW6 2QJ
• E.P.C. Services UK Ltd
  38 Skylines Village, Limeharbour, LONDON, Greater London, E14 9TS
• Eagle Global Group
  Mistral House Matrix Business Centre, Victoria Road, DARTFORD, Kent, DA1 5AJ
• Earning Telephone Numbers
  401 Langham House, 302-308 Regent Street, LONDON, Greater London, W1B 3HH
• Eci Telecom UK Ltd
  12 York Gate, LONDON, Greater London, NW1 4QS
• Econet Carrier Services
  1 Kingsway, LONDON, Greater London, WC2B 6XD
• Eircom UK Ltd
  183 Marsh Wall, LONDON, Greater London, E14 9SH
• Ekit UK
  148 Curtain Road, LONDON, Greater London, EC2A 3AT
• Energetic Enterprises
  39 Newlands Woods, Bardolph Avenue, CROYDON, Surrey, CR0 9JQ
• Equant Solutions
  11 Universal House, 88-94 Wentworth Street, LONDON, Greater London, E1 7SA
• Erton Technology Ltd
  88a Tooley Street, LONDON, Greater London, SE1 2TF
• Esprit Telecom Networks Ltd
  58-59 Great Marlborough Street, LONDON, Greater London, WC1V 1DD