| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Conservation Technologies Ltd | 02201788 | 02/08/1991 | Dissolved |
| Curtin Watson International Limited | 02126204 | 05/12/1992 | Dissolved |
| Environment Management Limited | 02492668 | 17/04/1992 | Dissolved |
| Environmental Management Ltd | 02191084 | 30/09/1992 | Dissolved |
| Environmental Management Services Ltd. | 02201790 | 02/08/1991 | Dissolved |
| Land Restoration Systems (U K) Ltd | 02492677 | 31/03/1991 | Dissolved |
| Pocket Circus Limited | 01952341 | 05/08/1992 | Dissolved |
| Pocket Circus Limited | 01952341 | 05/08/1992 | Dissolved |
| The Centre for Environmental Management Limited | 02492670 | 17/04/1992 | Dissolved |
| Water Management Ltd | 01993045 | 02/08/1991 | Dissolved |
| Watson Desmonde Ltd | 02201789 | 02/08/1991 | Dissolved |
| Watson Hawksley Ltd | 01967980 | 02/08/1991 | Dissolved |
| Watson Hawksley Quantity Surveying Ltd | 02008566 | 02/08/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Montgomery Watson Ltd | 04208168 | 28/06/2001 | 01/02/2005 | Dissolved |
| Montgomery Watson Projects Ltd | 02339158 | 03/04/1995 | 05/04/2004 | Dissolved |
| STANTEC EUROPE LIMITED | 02438136 | 31/10/1991 | 05/05/2004 | Gold |
| STANTEC MIDDLE EAST LIMITED | 03824962 | 03/09/1999 | 05/04/2004 | Amber |
| STANTEC UK LIMITED | 01188070 | 28/12/1991 | 05/04/2004 | Silver |
| STIRLING WATER SEAFIELD FINANCE PLC | SC190621 | 25/03/1999 | 28/05/1999 | Silver |
| STIRLING WATER SEAFIELD HOLDINGS LIMITED | SC190803 | 25/03/1999 | 28/05/1999 | Gold |
| STIRLING WATER SEAFIELD LIMITED | SC182250 | 25/03/1999 | 28/05/1999 | Silver |