| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| A B Electronic Equipment Ltd | 00852115 | 30/09/1992 | Dissolved |
| Copa International Ltd | 02328911 | 31/03/1993 | Dissolved |
| Geophysical Equipment (Bedford) Limited | 01489742 | 30/09/1992 | Dissolved |
| Rugged Environmental Technology Systems Ltd | 02674239 | 30/09/1992 | Dissolved |
| THE HARKNESS FELLOWS ASSOCIATION AND TRANSATLANTIC TRUST | 04168003 | 12/05/2024 | Gold |
| Wuidart Engineering Ltd | 02674144 | 30/09/1992 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACETIP | 01576464 | 20/03/1995 | 01/03/2002 | Dissolved |
| ANALAQ LIMITED | 02114891 | 20/07/1992 | 01/03/2002 | Dissolved |
| COATS SHELFCO (G&CL) LIMITED | 00517094 | 27/07/1991 | 17/12/1991 | Dissolved |
| D.M.P. (HOLDINGS) LIMITED | 02094479 | 09/08/1992 | 01/03/2002 | Dissolved |
| ELE DATASYSTEMS | 01085369 | 01/03/1998 | 01/03/2002 | Dissolved |
| ENVIRONMENTAL SERVICES ASSOCIATION LIMITED | 00962961 | 01/04/2013 | 29/11/2013 | Gold |
| EXE CONTINENTAL | 02376963 | 28/09/1995 | 01/03/2002 | Dissolved |
| EXMOOR CALVERT TRUST | 02637448 | 15/03/1997 | 25/04/2015 | Bronze |
| Ele International Ltd | 02307609 | 15/07/1993 | 21/05/1996 | Dissolved |
| Environmental Instrumentation Group Ltd | 02295798 | 26/05/1993 | 04/02/2002 | Dissolved |
| GREENHILL ENVIRONMENTAL LIMITED | 01772778 | 03/11/1997 | 01/03/2002 | Dissolved |
| HAUL WASTE LIMITED | 00679090 | 01/03/1998 | 01/03/2002 | Dissolved |
| HEYDEMANN SHAW LIMITED | 00191015 | 30/07/1991 | 31/12/1991 | Dissolved |
| JOHN MURGATROYD LIMITED | 00240049 | 30/06/1991 | 17/12/1991 | Dissolved |
| LAUNCHCHANGE INSTRUMENTATION LIMITED | 02330973 | 29/08/1995 | 04/02/2002 | Silver |
| MICHCO 210 LIMITED | 01167328 | 30/09/1992 | 15/12/2000 | Dissolved |
| PENINSULA | 00685236 | 01/03/1998 | 01/03/2002 | Dissolved |
| PENINSULA PROPERTIES (EXETER) LIMITED | 02307220 | 24/09/1992 | 28/03/2002 | Amber |
| PENNON GROUP PLC | 02366640 | 30/09/1992 | 30/09/2013 | Silver |
| PENNON POWER LIMITED | 00736732 | 01/03/1998 | 01/03/2002 | Silver |
| PENNON SOUTH WEST LIMITED | 02421516 | 31/03/1993 | 01/03/2002 | Dissolved |
| PENNON WASTE MANAGEMENT LIMITED | 00574299 | 30/09/1992 | 01/03/2002 | Dissolved |
| PHOX SYSTEMS LIMITED | 01081019 | 30/09/1992 | 01/03/2002 | Dissolved |
| PREMIER DECORATIVE PRODUCTS LIMITED | 02630824 | 22/09/1998 | 10/08/1999 | One Red Flag |
| Pennon Products Ltd | 01499385 | 31/03/1993 | 01/03/2002 | Dissolved |
| RYDON PROPERTIES LIMITED | 02406261 | 24/07/1992 | 31/10/2006 | Dissolved |
| SEAL SECURITY SYSTEMS LIMITED | 01841937 | 30/09/1992 | 03/08/1994 | Dissolved |
| SWW PENSION TRUSTEES LIMITED | 02451999 | 16/07/1993 | 01/03/2002 | Not Trading |
| THOMAS AMBLER & SONS LIMITED | 00451728 | 30/07/1991 | 17/12/1991 | Insolvent |
| THOMAS BURNLEY & SONS,LIMITED | 00038376 | 02/06/1991 | 17/12/1991 | Not Trading |
| VALENCIA WASTE DISPOSAL LIMITED | 02722409 | 19/07/1995 | 22/03/2010 | Not Trading |
| VALENCIA WASTE EXETER LIMITED | 01403771 | 12/12/1997 | 22/03/2010 | One Red Flag |
| VALENCIA WASTE MANAGEMENT LIMITED | 00575069 | 05/02/1993 | 30/09/2013 | One Red Flag |
| VIRIDOR CONTRACTING LIMITED | 03736621 | 24/03/1999 | 01/03/2002 | Dissolved |
| VIRIDOR ENTERPRISES LIMITED | 02089280 | 09/08/1992 | 01/03/2002 | Dissolved |
| VIRIDOR LIMITED | 02456473 | 10/02/2006 | 30/11/2014 | Silver |
| VIRIDOR SOUTH WEST LIMITED | 02649478 | 27/09/1992 | 01/03/2002 | Dissolved |
| VIRIDOR WASTE 2 LIMITED | 02298543 | 10/06/1998 | 15/11/2007 | Strike Off |
| VIRIDOR WASTE HAMPSHIRE LIMITED | 02434368 | 03/11/1997 | 22/03/2010 | Dissolved |
| VIRIDOR WASTE LIMITED | 02662755 | 30/09/1992 | 30/09/2013 | Gold |
| WATER WEST LIMITED | 01195844 | 31/03/1993 | 01/03/2002 | Dissolved |
| Warren Jones Ltd | 02575700 | 01/03/1998 | 01/03/2002 | Dissolved |