| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cytocare Limited | 02537866 | 07/09/1992 | Dissolved |
| Emit Engineering Limited | 02277614 | 11/08/1992 | Dissolved |
| Wessex Laboratories Limited | 02277602 | 11/08/1992 | Dissolved |
| Wessex Plumbing Services Limited | 02277513 | 07/09/1991 | Dissolved |
| Wessex Scientific Services Ltd | 02277593 | 11/08/1992 | Dissolved |
| Wessex Water Business Services Limited | 02372081 | 30/09/1992 | Dissolved |
| Wessex Water Corporation Plc | 02278664 | 07/09/1991 | Dissolved |
| Wessex Water Group Plc | 02277800 | 07/09/1991 | Dissolved |
| Wessex Water Holdings Plc | 02277811 | 07/09/1991 | Dissolved |
| Wessex Water Operational Services Ltd | 02277817 | 30/09/1992 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BIFFA WASTE MANAGEMENT LIMITED | 01138022 | 26/01/1993 | 03/01/1995 | Silver |
| Carillion Wolverhampton Ltd | 02464479 | 01/01/1993 | 09/02/1996 | Dissolved |
| Future West | 02805661 | 01/09/1993 | 22/07/1996 | Dissolved |
| INSTITUTE OF WATER | 00539193 | 30/04/1993 | 24/04/1997 | Gold |
| PILMUIR WASTE DISPOSAL LIMITED | 01829739 | 10/04/1992 | 03/01/1995 | Dissolved |
| UK WASTE MANAGEMENT LIMITED | 01362615 | 16/10/1991 | 30/11/1994 | Silver |
| WESTWICK CONSTRUCTION LIMITED | 02416353 | 07/09/1991 | 27/02/1997 | Dissolved |