• 4 Thought
  17 Mill Lane, WELWYN, Hertfordshire, AL6 9EU
• A W S
  46 Hyde Road, Caddington, LUTON, Bedfordshire, LU1 4HE
• Ace Communications
  27 Parnel Road, WARE, Hertfordshire, SG12 7LE
• Anglia Telecoms
  1 Gateshead Close, SANDY, Bedfordshire, SG19 1RS
• Antenna Systems Ltd
  Unit 1 Dicker Mill, HERTFORD, Hertfordshire, SG13 7AE
• Astra Telecom Ltd
  26 Peartree Court, WELWYN GARDEN CITY, Hertfordshire, AL7 3XN
• BJT Communications
  John Street, ROYSTON, Hertfordshire, SG8 9BE
• Berg Electronics
  The Maltings, Bridge St, HITCHIN, Hertfordshire, SG5 2DE
• Chiltern Telecom Ltd
  61 Union Street, DUNSTABLE, Bedfordshire, LU6 1EX
• Communications Accessories & Equipment Ltd
  Unit 19 Apex Business Centre, Boscombe Road, DUNSTABLE, Bedfordshire, LU5 4SB
• Cryo Systems Ltd
  Eaton House, Eaton Green Road, LUTON, Bedfordshire, LU2 9LD
• Datasource
  57 Verulam Gardens, LUTON, Bedfordshire, LU3 3SE
• Dolphin Business Systems
  Rookery Nook, Cardington Road, BEDFORD, Bedfordshire, MK44 3SA
• Ecocall Ltd
  Ver House, 23 High Street, Redbourn, ST ALBANS, Hertfordshire, AL3 7LE
• Entropie Voice Data
  Miller Road, BEDFORD, Bedfordshire, MK42 9NY
• Esto-Tech Ltd
  The Town House, Cottered, BUNTINGFORD, Hertfordshire, SG9 9PZ
• F.B.S. Telecommunications Ltd
  19 Hemel Hempstead Road, Redbourn, ST ALBANS, Hertfordshire, AL3 7NL
• Gigasat Ltd
  21 Moor End, Eaton Bray, DUNSTABLE, Bedfordshire, LU6 2HN
• Multi Products Corporation Ltd
  10 Dudley Street, LUTON, Bedfordshire, LU2 0NT
• Navtel Communications
  Fountains Road, LUTON, Bedfordshire, LU3 1LU
• Nu Technologies Ltd
  Regent Court, Laporte Way, LUTON, Bedfordshire, LU4 8LW
• Primex Solutions
  Crystal House, 7 New Bedford Road, LUTON, Bedfordshire, LU1 1HS
• Proactive
  26 Old North Road, ROYSTON, Hertfordshire, SG8 5DT
• Procom (Installations) Ltd
  H Abbeygate Business Centre, Hitchin Road, LUTON, Bedfordshire, LU2 0ER
• Sedgewall Communications Group Ltd
  Unit 19 Apex Business Centre, Boscombe Road, DUNSTABLE, Bedfordshire, LU5 4SB
• Smith Myers Communications Ltd
  Unit 2 Omega Centre Stratton Business Park, London Road, BIGGLESWADE, Bedfordshire, SG18 8QB
• Sound Concepts
  56 St Saviours Cresent, LUTON, Bedfordshire, LU1 5HG
• Sterry Communications Ltd
  6 Silver Court, Watchmead, WELWYN GARDEN CITY, Hertfordshire, AL7 1LT
• T.Mina Communication
  88 Leagrave Road, LUTON, Bedfordshire, LU4 8HZ
• Target Telecom
  Unit 18, Thrales End Lane, HARPENDEN, Hertfordshire, AL5 3NS
• Tekmos
  Unit 6, 80-81 Walsworth Road, HITCHIN, Hertfordshire, SG4 9SX
• The Professional Monitor
  43-45 Crawley Green Road, LUTON, Bedfordshire, LU2 0AA
• Unison Corporate Communications
  Unit 19 Apex Business Centre, Boscombe Road, DUNSTABLE, Bedfordshire, LU5 4SB
• Voice Services Ltd
  6 Martinfield Business Centre, Martinfield, WELWYN GARDEN CITY, Hertfordshire, AL7 1HG