| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| COLCHESTER DEVELOPMENT LIMITED | NI044797 | 30/01/2004 | Dissolved |
| KELTBRAY BUILDING SERVICES LIMITED | 03292310 | 31/03/2000 | Amber |
| KELTBRAY DEMOLITION LIMITED | 01554321 | 16/02/1995 | Gold |
| KELTBRAY SPECIALIST WORKS LIMITED | 05772483 | 06/04/2006 | Dissolved |
| KELTBRAY WASTE SERVICES LIMITED | 02051681 | 26/10/2003 | Dissolved |
| NUCLEAR WASTE MANAGEMENT LIMITED | 04388373 | 09/03/2006 | Dissolved |
| QUALIFIED RECRUITMENT LIMITED | 05190574 | 30/07/2004 | Not Trading |
| SATURN LAND LIMITED | 06771858 | 22/02/2011 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| KELTBRAY AWS LIMITED | 04836483 | 23/07/2003 | 22/05/2007 | Bronze |
| KELTBRAY ELECTRIFICATION PLANT LIMITED | 04305072 | 25/07/2003 | 19/02/2014 | Gold |
| KELTBRAY ENVIRONMENTAL LTD | 06564049 | 05/06/2008 | 20/03/2023 | Bronze |
| KELTBRAY GROUP (HOLDINGS) LIMITED | 02810840 | 20/07/2000 | 28/10/2020 | Amber |
| KELTBRAY LIMITED | 01274344 | 16/02/1995 | 27/10/2020 | One Red Flag |
| KELTBRAY PLANT LIMITED | 01675402 | 16/02/1995 | 28/10/2020 | Silver |
| PLANNED CONSTRUCTION SOLUTIONS LIMITED | 04303434 | 25/07/2003 | 31/12/2008 | Dissolved |
| WENTWORTH HOUSE RAIL SYSTEMS LIMITED | 06696437 | 12/09/2008 | 14/01/2013 | Bronze |