- Entryphone Company Limited
 - Manufacture and installation of audio and video door telephone systems. - FLAG Telecom
- Westminster - Offers a broad range of products and services to international carriers, service providers, and other telecommunications companies.
- Harmarney International Ltd
- Offers customer care and billing services and software for telecommuications providers.
- Kelly Communications Ltd
- Harrow - Cable installers, fibre optics, MDU, CATV, and other cable services.
- Mayfair Telecom plc
- Southwark - Produces calling cards, direct access and free phone numbers, and mobile phones.
- Swiftnet Ltd
- Licensed carrier providing the business world with voice, fax and value added Internet based telecommunication services.
- Telewest Broadband
- Offering cable telephone and TV services to a number of London boroughs.
- Video Conference Center
- Offers video conference facilities in London.
- Virtualplus
- Provides outsourced telecommunications and messaging services to ISPs, telecommunications companies, web portals, and corporations.
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