| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Certa (Europe) Ltd | 03393671 | 23/06/1997 | Dissolved |
| Certa (International) Ltd | 03393766 | 23/06/1997 | Dissolved |
| Certa Europe Ltd | 03194721 | 07/05/1999 | Dissolved |
| Certa Financial Ltd | 03194537 | 07/05/1999 | Dissolved |
| Certa Holdings (Uk) Ltd | 03393773 | 23/06/1997 | Dissolved |
| Certa Insurance Services Ltd. | 03194704 | 07/05/1999 | Dissolved |
| Certa Systems Ltd | 03194531 | 07/05/1999 | Dissolved |
| The Certa Foundation | 03468746 | 14/11/1997 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Certa (U K) Ltd | 03393662 | 23/06/1997 | 11/02/2004 | Dissolved |
| First Energy (U K) Ltd | 02345685 | 04/05/1992 | 24/10/1997 | Dissolved |
| UNIPER UK GAS LIMITED | 02436332 | 25/10/1992 | 01/04/1997 | Silver |