| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| A E A Technology Consulting Ltd | 03524840 | 01/04/2001 | Dissolved |
| A E A Technology Energy Ltd | 03524836 | 01/04/2001 | Dissolved |
| A E A Technology Nuclear Engineering Ltd | 03530476 | 01/04/2001 | Dissolved |
| A E A Technology Products & Systems Ltd | 03531107 | 01/04/2001 | Dissolved |
| Aea Technology Nuclear Science Ltd | 03530469 | 01/04/2001 | Dissolved |
| Batteries Ltd | 03531119 | 01/04/2001 | Dissolved |
| Nuclear Science Ltd | 03530473 | 01/04/2001 | Dissolved |
| Products & Systems Ltd | 03530471 | 01/04/2001 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACCENTUS MEDICAL LIMITED | 04146523 | 05/11/2001 | 15/04/2003 | Amber |
| ARRIVA TRAINS HOLDINGS LIMITED | 03076782 | 15/03/2004 | 17/11/2006 | Gold |
| AYLESBURY VALE PARKWAY LIMITED | 05840872 | 08/06/2006 | 17/11/2006 | Silver |
| Aea Sonomatic Ltd | 01356426 | 01/04/2001 | 20/09/2001 | Dissolved |
| Aea Technology Batteries Ltd | 03524842 | 01/04/2001 | 20/09/2001 | Dissolved |
| Aea Technology Environment Ltd | 03524827 | 01/04/2001 | 20/09/2001 | Dissolved |
| Aea Technology International Ltd | 02699932 | 01/04/2001 | 20/09/2001 | Dissolved |
| Aea Technology Qsa Ltd | 03531116 | 01/04/2001 | 20/09/2001 | Dissolved |
| Aea Technology Rail Ltd | 03531111 | 01/04/2001 | 20/09/2001 | Dissolved |
| Aea Technology Services Ltd | 02707078 | 01/04/2001 | 20/09/2001 | Dissolved |
| CITY GREENWICH LEWISHAM RAIL LINK PLC | 03169276 | 20/10/2004 | 17/11/2006 | Insolvent |
| COLESHILL PARKWAY LIMITED | 05608780 | 01/11/2005 | 17/11/2006 | Gold |
| ERG ENVIRONMENTAL RESOURCE GROUP PLC | 03379741 | 19/09/1997 | 14/01/1998 | Dissolved |
| Electrocat Ltd | 03530474 | 01/04/2001 | 20/09/2001 | Dissolved |
| Erg Environmental Resource Ltd | 01336621 | 07/09/1997 | 14/01/1998 | Dissolved |
| FORENSIC ALLIANCE LIMITED | 03218467 | 06/12/1999 | 01/04/2002 | Dissolved |
| JOHN LAING PROJECTS & DEVELOPMENTS LIMITED | 04420886 | 15/03/2004 | 17/11/2006 | Bronze |
| LAING RAIL PROJECT EVERGREEN (HOLDINGS) LIMITED | 04420901 | 15/03/2004 | 17/11/2006 | Dissolved |
| LAING RAIL PROJECT EVERGREEN LIMITED | 04420889 | 15/03/2004 | 17/11/2006 | Dissolved |
| Laputa Enterprises Ltd | 03294013 | 01/04/2001 | 20/09/2001 | Dissolved |
| M40 TRAINS LIMITED | 03005018 | 15/03/2004 | 27/07/2006 | Gold |
| PLOUGHSHARE INNOVATIONS LTD | 04401901 | 30/03/2010 | 27/11/2015 | One Red Flag |
| RESONATE NOTIFIED BODY LIMITED | 03524823 | 30/06/2001 | 01/07/2002 | Not Trading |
| SAFEGUARD INTERNATIONAL LIMITED | 02798701 | 01/04/2001 | 20/09/2001 | Dissolved |
| THE CHILTERN RAILWAY COMPANY LIMITED | 03007939 | 15/03/2004 | 27/07/2006 | Silver |
| Transportation Consultants International Ltd | 03210050 | 01/04/2001 | 20/09/2001 | Dissolved |