| Column 1 | Column 2 |
|---|
| ACC Long Distance UK Limited | 21.04.1997 |
| Advanced Radio Telecom Limited | 21.04.1997 |
| AT & T Communications (UK) Ltd | 20.12.1994 |
| Atlantic Telecommunications Limited | 30.12.1997 |
| COLT Telecommunications | 09.06.1995 |
| Comple Tel UK Limited | 11.01.1999 |
| Core Telecommunications Limited | 25.06.1999 |
| Eastern Group Telecoms Limited | 24.07.1996 |
| Energis Communications Limited | 24.05.1993 |
| Enitel ASA | 25.06.1999 |
| Esprit Telecom UK Limited | 30.12.1997 |
| Faultbasic Limited | 15.01.1999 |
| General Telecommunications Limited | 11.08.1997 |
| Highway One Corporation Limited | 25.09.1997 |
| Inter Digital Networks Limited | 01.06.1999 |
| International Computers Limited | 22.06.1998 |
| Internet Network Services Limited | 25.09.1997 |
| Kingston Communications (Hull) PLC | 24.03.1999 |
| Level 3 Communications Limited | 28.10.1998 |
| Mercury Communications Limited | 05.12.1991 |
| MFS Communications Limited | 24.09.1993 |
| MLL Telecom Limited | 22.06.1998 |
| National Transcommunications Limited | 14.02.1996 |
| NORWEB PLC | 03.03.1994 |
| Racal Network Services Limited | 02.09.1994 |
| RadioTel Systems Limited | 28.04.1997 |
| Rateflame Limited | 01.06.1999 |
| Scottish Hydro-Electric PLC | 24.05.1993 |
| Scottish Power Telecommunications Limited | 24.09.1993 |
| Sprint Holding (UK) Limited | 31.03.1994 |
| SWEB Telecoms Limited | 15.09.1995 |
| Tele2 (UK) Limited (formerly known as Liberty Communications Limited) | 23.02.1995 |
| Telia UK Ltd | 08.03.1999 |
| Telstra (UK) Limited | 31.03.1994 |
| Torch Communications Limited | 08.02.1996 |
| Videotron City and Westminster Limited | 03.03.1994 |
| Winstar Communications Limited | 25.06.1999 |