| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Employment Relations Associates Ltd | 01834672 | 31/12/2007 | Dissolved |
| Logicair Ltd | 03615252 | 15/10/2004 | Dissolved |
| Rakmulti Technology Ltd | 02330931 | 26/02/2004 | Dissolved |
| SERCO-DENHOLM LIMITED | 03158133 | 11/02/2004 | Dissolved |
| Serco Inactive 3 Ltd | 03336924 | 01/03/2004 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| NORTHERN RAIL HOLDINGS LIMITED | 04007719 | 04/12/2001 | 09/07/2002 | Dissolved |
| SERCO CORPORATE SERVICES LIMITED | 04007730 | 21/10/2003 | 11/04/2006 | Not Trading |
| SERCO HOLDINGS LIMITED | 03970268 | 21/06/2000 | 03/12/2001 | Silver |
| SERCO LIMITED | 00242246 | 09/05/2003 | 18/12/2006 | Silver |
| SOCIETY OF BRITISH AEROSPACE COMPANIES (THE) | 00143447 | 01/03/2006 | 01/03/2007 | Dissolved |