| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CHARACTER SECURITY SOLUTIONS LTD | 07910204 | 16/01/2012 | Dissolved |
| Ketech Detection Ltd | 04241565 | 26/06/2001 | Dissolved |
| Key Radio Ltd | 02003408 | 14/09/2007 | Dissolved |
| Metro & Tube Services Ltd | 04241570 | 26/06/2001 | Dissolved |
| RED ALE HOUSES COMPANY LTD | 08765931 | 07/11/2013 | Dissolved |
| SYNOPTA LIMITED | 06140180 | 06/03/2007 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AMEY DATEL SECURITY AND COMMUNICATIONS LIMITED | 03601293 | 01/09/1998 | 12/11/1999 | Dissolved |
| DITRA SYSTEMS LIMITED | 01321550 | 03/11/2006 | 19/03/2010 | Dissolved |
| KETECH GROUP LTD | 04250992 | 12/07/2001 | 01/06/2004 | One Red Flag |
| KETECH GROUP LTD | 04250992 | 12/07/2001 | 19/03/2010 | One Red Flag |
| KETECH LIMITED | 03103631 | 19/09/1995 | 23/08/2003 | Dissolved |
| KETECH SECURITY SYSTEMS LTD | 06140221 | 06/03/2007 | 17/03/2010 | Dissolved |
| Ketech Detection Ltd | 04241565 | 26/06/2001 | 20/06/2007 | Dissolved |
| Metro & Tube Services Ltd | 04241570 | 26/06/2001 | 29/05/2004 | Dissolved |