| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ATREBATUM LIMITED | 05330193 | 12/01/2005 | Amber |
| Omneta Trading Ltd | 05820727 | 17/05/2006 | Dissolved |
| SPEECH SORT LIMITED | 04542091 | 05/04/2003 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BUILDING SERVICES PUBLICATIONS LIMITED | 00657176 | 10/05/2006 | 20/10/2011 | Dissolved |
| CIBSE CERTIFICATION LIMITED | 06083016 | 01/11/2007 | 12/08/2019 | Bronze |
| CIBSE SERVICES LIMITED | 03645473 | 01/11/2007 | 01/06/2021 | Silver |
| LAGONDA CLUB LIMITED | 02166365 | 27/10/1999 | 28/04/2005 | Gold |
| LAGONDA CLUB LIMITED | 02166365 | 06/12/1996 | 28/04/2005 | Gold |
| NATIONAL ENGINEERING SPECIFICATION LIMITED | 01842644 | 10/10/2006 | 24/09/2010 | Dissolved |
| Omneta Ltd | SC286696 | 20/07/2005 | 19/08/2006 | Dissolved |
| THE ENGINEERING AND TECHNOLOGY BOARD | 04322409 | 03/09/2007 | 18/06/2009 | Amber |