• 500 Ltd
  5b George Street, ST ALBANS, Hertfordshire, AL3 4ER
• 5g Communications Ltd
  Phoenix House, Desborough Park Road, High Wycombe, Buckinghamshire, HP12 3BQ
• A & R Telecom
  Unit 33 Drca Business Centre, Charlotte Despard Avenue, LONDON, Greater London, SW11 5HD
• A C Communication
  198 Grasmere Way, LEIGHTON BUZZARD, Bedfordshire, LU7 2QH
• A C I Ltd
  Crossbow House, 40 Liverpool Road, SLOUGH, Berkshire, SL1 4QZ
• A J W Services
  121 Waller Avenue, LUTON, Bedfordshire, LU4 9RR
• A Star Solutions Ltd
  148 Broadwater Crescent, STEVENAGE, Hertfordshire, SG2 8EP
• Aa Access Services Ltd
  Northumberland House 11 The Pavement Popes Lane, Ealing, LONDON, Greater London, W5 4NG
• 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
• Advent Communications
  Preston Hill House, Preston Hill, CHESHAM, Buckinghamshire, HP5 3HE
• Aic Telecom UK Ltd
  12-13 Little Newport Street, LONDON, Greater London, WC2H 7JJ
• Air Radio
  High Street, Harmondsworth, WEST DRAYTON, Middlesex, UB7 0BT
• Alicom Systems Ltd
  11 Eghams Court, Boston Drive, BOURNE END, Buckinghamshire, SL8 5YS
• Alison Townsend Ltd
  11 Eghams Court, Boston Drive, BOURNE END, Buckinghamshire, SL8 5YS
• Ant Communications
  4 Front House, Stonefield Way, RUISLIP, Middlesex, HA4 0JS
• Arbinet-Thexchange Ltd
  12-18 Paul Street, LONDON, Greater London, EC2A 4JH
• Artel Scaffolding Ltd
  Fiboard House, Oakleigh Gardens, LONDON, Greater London, N20 9AB
• Aspetel Services
  2 Wallingford Road, UXBRIDGE, Middlesex, UB8 2BB
• Avaya
  Stirling Court, 15-21 Mundells, WELWYN GARDEN CITY, Hertfordshire, AL7 1LZ
• 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 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
• Biscit Telecommunications Ltd
  9 Hale Lane, LONDON, Greater London, NW7 3NU
• Bobe
  374 Caledonian Road, LONDON, Greater London, N1 1DY
• C E S Telecom
  15-17 Newgate Street Village, HERTFORD, Hertfordshire, SG13 8RA
• 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
• 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
• Call Centre International
  1d Eldon Parade, Eldon Road, LONDON, Greater London, N22 5DU
• Call Sciences
  126 Fairlie Road, SLOUGH, Berkshire, SL1 4PY
• 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
• Cellnet
  260 Bath Road, SLOUGH, Berkshire, SL1 4DX
• Central Telecom
  28 King Street, LONDON, Greater London, EC2V 8EA
• Chitter Chatter Ltd
  358 Oxford Street, LONDON, Greater London, W1C 1JJ
• 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
• Cloona Communications
  175 Hopton Road, STEVENAGE, Hertfordshire, SG1 2LF
• 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
• 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 Solve
  The Courtyard, 1a Church Lane, Sarratt, RICKMANSWORTH, Hertfordshire, WD3 6HN
• Community Care Management Services Ltd
  145 Cannon Street, LONDON, Greater London, EC4N 5BQ
• Compcom Ltd
  35 Thurloe Street, LONDON, Greater London, SW7 2LQ
• 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
• D J Purdy Telecomun Ications
  18 Bramingham Business Park, Enterprise Way, LUTON, Bedfordshire, LU3 4BU
• D P S S Cabling Services Ltd
  Unit 16 Chiltern Business Village, Arundel Road, UXBRIDGE, Middlesex, UB8 2SN
• Daleton Communications Ltd
  Suite 401 Langham House, 302-308 Regent Street, LONDON, Greater London, W1B 3HH
• 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 Coherent Communications Systems Ltd
  Abbey Place, 24-28 Eastern Street, HIGH WYCOMBE, Buckinghamshire, HP11 1NT
• 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
• 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
• Ekit UK
  148 Curtain Road, LONDON, Greater London, EC2A 3AT
• 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
• Ett
  52 Berkeley Square, LONDON, Greater London, W1J 5BT
• Eu Technology Ltd
  88a Tooley Street, LONDON, Greater London, SE1 2TF
• Eunet International Ltd
  10 Norwich Street, LONDON, Greater London, EC4A 1BD
• Euro Control Ltd
  29a New Cavendish Street, LONDON, Greater London, W1G 9UE
• Euromail Services
  105 High Street, RICKMANSWORTH, Hertfordshire, WD3 1AN
• Eurosom Telecom
  1 Brampton Park Road, LONDON, Greater London, N22 6BG
• Farfan Patric Assocs Ltd
  Quay West, Salamander Quay, Harefield, UXBRIDGE, Middlesex, UB9 6NZ
• Fax Preference Service
  Dma House, 70 Margaret Street, LONDON, Greater London, W1W 8SS
• First Technology Europe
  Royex House, Aldermanbury Square, LONDON, , EC2V
• Fish Mobile Communications Ltd
  Britannia House, 958-964 High Road, LONDON, Greater London, N12 9RY
• Focas Telecommunication Services
  405 Kings Road, LONDON, Greater London, SW10 0BB
• Focom Ltd
  Greene Field Road, BERKHAMSTED, Hertfordshire, HP4 2XD
• Fodatel
  36-38 Botolph Lane, LONDON, Greater London, EC3R 8DE
• Forum Communications
  43-45 Chase Side, LONDON, Greater London, N14 5BP
• Free 2 Call Ltd
  P O Box 3620, LONDON, Greater London, NW11 0AQ
• Fuszion
  891 Plymouth Road, SLOUGH, Berkshire, SL1 4LP
• G F H
  Nework House, 5 Endymion Court, HATFIELD, Hertfordshire, AL10 8AU
• GN Maritime UK Ltd
  5 St Helens Place, LONDON, Greater London, EC3A 6AU
• GTT - Emea Ltd
  26 Holborn Viaduct, LONDON, Greater London, EC1A 2AT
• Gaines International Europe
  Bucklersbury House, Walbrook, LONDON, Greater London, EC4N 8EL
• Gara Technologies Ltd
  Coughlan House, 12 Walmgate Road, GREENFORD, Middlesex, UB6 7LH