| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| SWANN ENGINEERING GROUP LTD. | 01164271 | 16/06/1991 | 28/10/2005 | Silver |
| T S C Consulting Engineers Ltd | 02659287 | 30/01/1998 | 28/10/2005 | Dissolved |
| Telecom Structures Consultancy Ltd | 03779110 | 20/05/1999 | 28/10/2005 | Dissolved |
| Towermaster Ltd | 00885531 | 18/06/1992 | 28/10/2005 | Dissolved |
| Towermaster Steelwork Ltd | 03487079 | 23/03/1998 | 28/10/2005 | Dissolved |