| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRENTWOOD HEALTHCARE PARTNERSHIP HOLDING LIMITED | 05398791 | 16/07/2008 | 01/06/2011 | Bronze |
| BRENTWOOD HEALTHCARE PARTNERSHIP LIMITED | 05398788 | 16/07/2008 | 01/06/2011 | Silver |
| CLINICENTA (HERTFORDSHIRE) LIMITED | 06820088 | 15/04/2009 | 15/08/2013 | Dissolved |
| HADFIELD HEALTHCARE PARTNERSHIPS HOLDING LIMITED | 05189884 | 16/07/2008 | 09/11/2011 | Gold |
| HADFIELD HEALTHCARE PARTNERSHIPS LIMITED | 05169193 | 30/01/2018 | 31/07/2020 | Amber |
| KELDA WATER SERVICES LIMITED | 02180706 | 17/03/1998 | 16/07/2003 | Gold |
| Oilteams Ltd | 02393276 | 08/06/1992 | 20/02/1997 | Dissolved |
| SCOTTISH WATER SERVICES (GRAMPIAN) LIMITED | SC206426 | 19/04/2000 | 01/06/2000 | Bronze |
| STOCKLEY PARK ESTATE MANAGEMENT LIMITED | 03978229 | 08/07/2008 | 12/09/2013 | Dissolved |
| Yorkshire Water (China) Ltd | 02354948 | 09/04/1999 | 16/07/2003 | Dissolved |