| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| INTERMEDIATE SCIT LIMITED | 04393598 | 13/03/2002 | Dissolved |
| SCIT (HOLDINGS) LIMITED | 06291061 | 31/08/2007 | Dissolved |
| SCIT LIMITED | 03626652 | 06/04/2001 | Dissolved |
| STS COMPETENCE ASSURANCE SERVICES LIMITED | 04583823 | 14/11/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| LES MAY SIGNALLING LIMITED | 07224992 | 21/01/2011 | 01/04/2012 | Dissolved |
| TESTING INSTALLATION CORRELATION SERVICES (GLOBAL) LIMITED | 07164795 | 21/01/2011 | 01/04/2012 | Silver |