• 500 Ltd
  5b George Street, ST ALBANS, Hertfordshire, AL3 4ER
• 5g Communications Ltd
  Phoenix House, Desborough Park Road, High Wycombe, Buckinghamshire, HP12 3BQ
• A B C Telecom
  10 Pheasant Drive, HIGH WYCOMBE, Buckinghamshire, HP13 5JH
• A C I Ltd
  Crossbow House, 40 Liverpool Road, SLOUGH, Berkshire, SL1 4QZ
• A.B.C Data Communications
  10 Pheasant Drive, HIGH WYCOMBE, Buckinghamshire, HP13 5JH
• Aa Access Services Ltd
  Northumberland House 11 The Pavement Popes Lane, Ealing, LONDON, Greater London, W5 4NG
• Act Teleconferencing Ltd
  Queens House, Kymberley Road, HARROW, Middlesex, HA1 1US
• Addaphone
  6 Cotswold Green, AYLESBURY, Buckinghamshire, HP20 2HB
• Advanced Telecom Networks Ltd
  531-533 High Road, WEMBLEY, Middlesex, HA0 2DJ
• Advent Communications
  Preston Hill House, Preston Hill, CHESHAM, Buckinghamshire, HP5 3HE
• 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
• Alpha Prepaid Ltd
  391 Richmond Road, TWICKENHAM, Middlesex, TW1 2EF
• Alpha Telecom
  391 Richmond Road, TWICKENHAM, Middlesex, TW1 2EF
• Ant Communications
  4 Front House, Stonefield Way, RUISLIP, Middlesex, HA4 0JS
• Aspetel Services
  2 Wallingford Road, UXBRIDGE, Middlesex, UB8 2BB
• B2bt For Business's In West London
  Studio 3.1, 114 Power Road, LONDON, Greater London, W4 5PY
• Ballast Nedan I P M Ltd
  54 Suttons Business Park, Sutton Park Avenue, Earley, READING, Berkshire, RG6 1AZ
• Biscit Telecommunications Ltd
  9 Hale Lane, LONDON, Greater London, NW7 3NU
• Breakthrough Global Ltd
  Marcar House, Parkshot, RICHMOND, Surrey, TW9 2RG
• Buttontel
  3 Park Street, WINDSOR, Berkshire, SL4 1LU
• 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 Sciences
  126 Fairlie Road, SLOUGH, Berkshire, SL1 4PY
• Calling Places Ltd
  12 Ashbourne Road, LONDON, Greater London, W5 3ED
• Callworld UK
  88 Uxendon Hill, WEMBLEY, Middlesex, HA9 9SJ
• Cellnet
  260 Bath Road, SLOUGH, Berkshire, SL1 4DX
• Chanistan Trading
  79 Chiltern Crescent, Earley, READING, Berkshire, RG6 1AL
• Commlinks
  96 Harlington Road West, FELTHAM, Middlesex, TW14 0JJ
• Communication 2000
  215 Edgware Road, LONDON, Greater London, NW9 6LP
• Communications Solve
  The Courtyard, 1a Church Lane, Sarratt, RICKMANSWORTH, Hertfordshire, WD3 6HN
• Contactica
  Haw Lane, Saunderton, HIGH WYCOMBE, Buckinghamshire, HP14 4JD
• Corex Networks Ltd
  250 Gunnersbury Avenue, LONDON, Greater London, W4 5QB
• Coruscant International
  1 Chandos Road, BOREHAMWOOD, Hertfordshire, WD6 1UU
• Cramer Systems
  8 The Square, Stockley Park, UXBRIDGE, Middlesex, UB11 1FW
• Crosslink Communications UK Ltd
  6 Petersfield, Stoke Mandeville, AYLESBURY, Buckinghamshire, HP22 5XU
• D P S S Cabling Services Ltd
  Unit 16 Chiltern Business Village, Arundel Road, UXBRIDGE, Middlesex, UB8 2SN
• Direct Save Telecom
  Hartcran House, Gibbs Couch, WATFORD, Hertfordshire, WD19 5EZ
• E Coherent Communications Systems Ltd
  Abbey Place, 24-28 Eastern Street, HIGH WYCOMBE, Buckinghamshire, HP11 1NT
• Euromail Services
  105 High Street, RICKMANSWORTH, Hertfordshire, WD3 1AN
• Farfan Patric Assocs Ltd
  Quay West, Salamander Quay, Harefield, UXBRIDGE, Middlesex, UB9 6NZ
• Flextel Telecommunications
  24-28 ST. Leonards Road, WINDSOR, Berkshire, SL4 3BB
• Focom Ltd
  Greene Field Road, BERKHAMSTED, Hertfordshire, HP4 2XD
• Foneandsurf.Com
  343 Bath Road, HOUNSLOW, Middlesex, TW3 3DH
• Fulcrum Headsets
  Hillbottom Road, Sands Industrial Estate, HIGH WYCOMBE, Buckinghamshire, HP12 4HJ
• Fulcrum Voice Technologies Ltd
  Hillbottom Road, Sands Industrial Estate, HIGH WYCOMBE, Buckinghamshire, HP12 4HJ
• Fuszion
  891 Plymouth Road, SLOUGH, Berkshire, SL1 4LP
• Gara Technologies Ltd
  Coughlan House, 12 Walmgate Road, GREENFORD, Middlesex, UB6 7LH
• Gem Cable Services Ltd
  154 ST. Albans Road, Sandridge, ST ALBANS, Hertfordshire, AL4 9LP
• Giblin Telecom Ltd
  589 London Road, SLOUGH, Berkshire, SL3 8QG
• Global Networks International Ltd
  16 Commercial Way, Abbey Road, LONDON, Greater London, NW10 7XF
• Graeme Minney Associates Ltd
  5 Ashley Green Road, CHESHAM, Buckinghamshire, HP5 3PE
• Gridcom UK Ltd
  Claremont House, Hatters Lane, WATFORD, Hertfordshire, WD18 8TR
• Handsfree Communications
  152 Westfield Road, DUNSTABLE, Bedfordshire, LU6 1DL
• Harrow International Call Centre
  72 Station Road, HARROW, Middlesex, HA1 2SQ
• Idirect Technologies
  270 Bath Road, SLOUGH, Berkshire, SL1 4DX
• Imax Networks Ltd
  Marlborough House, 159 High Street, Wealdstone, HARROW, Middlesex, HA3 5DX
• Inclarity Ltd
  8 Fulton Road, WEMBLEY, Middlesex, HA9 0NU
• Intelsat
  Building 3 Chiswick Park, Chiswick High Road, LONDON, Greater London, W4 5YA
• Intercai Mondiale Ltd
  High Street, MARLOW, Buckinghamshire, SL7 1AB
• International Call Centre
  150 Horn Lane, LONDON, Greater London, W3 6PG
• Iridiacom Ltd
  8 Allied Business Centre, Coldharbour Lane, HARPENDEN, Hertfordshire, AL5 4UT
• Isis Telecommunication Management
  86 Warwick Road, LONDON, Greater London, W5 5PT
• Kelly Brothers Communications
  Jockey Farm, Watling Street, DUNSTABLE, Bedfordshire, LU6 3QP
• Kingston Mediastream
  Chalfont Grove, Narcot Lane, Chalfont St. Peter, GERRARDS CROSS, Buckinghamshire, SL9 8TW
• Korus Group Ltd
  Korus House, 6-8 Colne Road, TWICKENHAM, Middlesex, TW1 4JR
• Korus Systems
  Korus House, 6-8 Colne Road, TWICKENHAM, Middlesex, TW1 4JR
• Leonard Computers & Communication Services Ltd
  1 Church Road, ISLEWORTH, Middlesex, TW7 4PL
• Lets Talk
  9 Cavendish Road, CHESHAM, Buckinghamshire, HP5 1RW
• Link Up
  25 Railway Terrace, KINGS LANGLEY, Hertfordshire, WD4 8JB
• London Communication Centre
  128 Hanworth Road, HOUNSLOW, Middlesex, TW3 1UG
• Matrix Telecommunications
  32 High Street, AYLESBURY, Buckinghamshire, HP20 1SF
• Mcclutton Telecom UK
  159 Luscinia View, Napier Road, READING, Berkshire, RG1 8AG
• Mobile Phones Supply & Services
  21 Glebe Avenue, HARROW, Middlesex, HA3 9LG
• NTL
  Centro 1, 1a Maxted Road, Hemel Hempstead Industrial Estate, HEMEL HEMPSTEAD, Hertfordshire, HP2 7EF
• NTL
  Customer Assistance, London Business Customer Service, NORTHWOOD, Middlesex, HA6 2TW
• NTL (B) Ltd
  Caxton Way, Watford Business Park, WATFORD, Hertfordshire, WD18 8UA
• NTL Telewest
  Marlborough House Wigmore Place, Wigmore Lane, LUTON, Bedfordshire, LU2 9EX
• National Business Communications Ltd
  Unit 16 Empire Centre, Imperial Way, WATFORD, Hertfordshire, WD24 4YH
• Nera Ltd
  Maxted Road, Hemel Hempstead Industrial Estate, HEMEL HEMPSTEAD, Hertfordshire, HP2 7DX
• Nortel Networks UK Pension Trust Ltd
  Maidenhead Office Park, Westacott Way, Littlewick Green, MAIDENHEAD, Berkshire, SL6 3QH
• O2 Store
  260 Bath Road, SLOUGH, Berkshire, SL1 4DX
• O2 UK Ltd
  260 Bath Road, SLOUGH, Berkshire, SL1 4DX
• O2 UK Ltd
  260 Bath Road, SLOUGH, Berkshire, SL1 4DX
• Old Talktalk UK Communication Services Ltd
  1 Portal Way, LONDON, Greater London, W3 6RS
• One 2 One
  Iimperial Place, Maxwell Road, BOREHAMWOOD, Hertfordshire, WD6 1EA
• Phonecalls.Co.Uk
  Imperial Studios, Maxwell Road, BOREHAMWOOD, Hertfordshire, WD6 1WR
• Qubic Ltd
  Priory House, Marsh Road, WEMBLEY, Middlesex, HA0 1ES
• RCS
  1 Folly Pathway, RADLETT, Hertfordshire, WD7 8DS
• Rak Communications
  678 Ealing Road, WEMBLEY, Middlesex, HA0 4BP
• Rasmi Telecom
  Hayes Gate House, 27 Uxbridge Road, HAYES, Middlesex, UB4 0JN
• S.I.T.A Telecomunications
  Clock Tower Road, ISLEWORTH, Middlesex, TW7 6DT
• Silver Tongue
  A 6 Upton Lea Parade, Wexham Road, SLOUGH, Berkshire, SL2 5JU
• Smart Trust
  112 ST. Leonards Road, WINDSOR, Berkshire, SL4 3DG
• Soh (Europe) Ltd
  6 Devonhurst Place, Heathfield Terrace, LONDON, Greater London, W4 4JD
• Somatel Communication
  473 High Road, WEMBLEY, Middlesex, HA9 7AG
• Sophax Telecommunications TLD
  A, 88 Leagrave Road, LUTON, Bedfordshire, LU4 8HZ
• Speechpath Telecommunications Ltd
  Kimpton Road, LUTON, Bedfordshire, LU2 0SX
• Subex Systems
  Winterton House, Nixey Close, SLOUGH, Berkshire, SL1 1ND
• Synchronized Communications Ltd
  4 Front House, Stonefield Way, RUISLIP, Middlesex, HA4 0JS
• Syntec Ltd
  The Avenue, LONDON, Greater London, W13 8PH
• Talking Business (Office Supplies) Ltd
  Grantwood House Unit 31, The Ridgeway, IVER, Buckinghamshire, SL0 9HW
• Talktalk Telecom Ltd
  1 Portal Way, LONDON, Greater London, W3 6RS
• Tawakal
  196a Church Road, LONDON, Greater London, NW10 9NP
• Tawakal Telecom
  8 High Street, Wealdstone, HARROW, Middlesex, HA3 7AA
• Telecom FM Ltd
  895 Plymouth Road, SLOUGH, Berkshire, SL1 4LP
• Telecom Training Solutions
  Intertrac House, High Street, TRING, Hertfordshire, HP23 4RG
• Telecoms Enterprises Ltd
  James House Mere Park, Dedmere Road, MARLOW, Buckinghamshire, SL7 1FJ
• Telecost
  4 Hernes Estate, Rotherfield Greys, HENLEY ON THAMES, Oxfordshire, RG9 4NT
• Telephonetics plc
  Hamilton House, Marlowes, HEMEL HEMPSTEAD, Hertfordshire, HP1 1BB
• The Message Centre
  101 High Street, TRING, Hertfordshire, HP23 4AB
• The Routers Group
  8 The Parade, Sudbury Heights Avenue, GREENFORD, Middlesex, UB6 0LZ
• Tollring Telecommunication Services
  Continental House, 497 Sunleigh Road, WEMBLEY, Middlesex, HA0 4LY
• Tower Technology Ltd
  270 Bath Road, SLOUGH, Berkshire, SL1 4DX
• Vale Tel Com
  34 Queens Mead, AYLESBURY, Buckinghamshire, HP21 7AL
• Vanco Net Direct Ltd
  John Busch House, 277 London Road, ISLEWORTH, Middlesex, TW7 5AX
• Vonaq
  9 Greenhill Crescent, WATFORD, Hertfordshire, WD18 8QU
• World Communication Centre
  132 Ealing Road, WEMBLEY, Middlesex, HA0 4TH
• Zoo Internet Service Direct
  Service Direct House, North Circular Road, LONDON, Greater London, NW10 7SH