| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| OAKWOOD ENERGY AND ENVIRONMENT (UK) LLP | OC367039 | 04/08/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| A B B Operations & Maintenance Services Ltd | 02771475 | 13/05/1993 | 16/11/1998 | Dissolved |
| Bridgetest Technical Services Ltd | 03266332 | 17/03/2004 | 10/02/2006 | Dissolved |
| CAMBI UK LIMITED | 03679626 | 25/01/2000 | 29/09/2000 | Silver |
| CAPSTEAD SYSTEMS LIMITED | 02477763 | 17/03/2004 | 10/02/2006 | Dissolved |
| CUNNINGTON AND COOPER LIMITED | 02009791 | 17/03/2004 | 10/02/2006 | Dissolved |
| European Nuclear Technologies Ltd | 03147381 | 17/03/2004 | 10/02/2006 | Dissolved |
| G. & J. WEIR, LIMITED | 02490830 | 17/03/2004 | 10/02/2006 | Not Trading |
| HARMCATCH LIMITED | 00527193 | 17/03/2004 | 10/02/2006 | Dissolved |
| HITACHI NUCLEAR ENERGY EUROPE, LIMITED | 09710636 | 13/05/2016 | 13/09/2017 | Dissolved |
| NORTH WEST ENERGY SQUARED LIMITED | 08595540 | 01/09/2018 | 20/05/2019 | One Red Flag |
| RENEWABLE TECHNOLOGY VENTURES LIMITED | SC243331 | 30/06/2003 | 10/02/2006 | Dissolved |
| THAMES WATER PRODUCTS LIMITED | 02249185 | 01/02/1999 | 29/02/2000 | Not Trading |
| TWG ENGINEERING (NO.3) LIMITED | 02029377 | 17/03/2004 | 10/02/2006 | Dissolved |
| TWG ENGINEERING (NO.4) LIMITED | 02477771 | 17/03/2004 | 10/02/2006 | Dissolved |
| TWG ENGINEERING (NO.5) LIMITED | 02640829 | 17/03/2004 | 10/02/2006 | Dissolved |
| TWG ENGINEERING (NO.7) LIMITED | 02531890 | 17/03/2004 | 10/02/2006 | Dissolved |
| TWG ENGINEERING (NO.9) LIMITED | 02700147 | 17/03/2004 | 10/02/2006 | Dissolved |
| Twg Engineering (No.6) Ltd | 03129282 | 17/03/2004 | 10/02/2006 | Dissolved |
| Twg Engineering (No.8) Ltd | 02652453 | 17/03/2004 | 10/02/2006 | Dissolved |
| Wingrove & Rogers Ltd | 02655312 | 17/03/2004 | 10/02/2006 | Dissolved |