| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AIRTO LIMITED | 01217006 | 01/07/2008 | 21/01/2015 | Silver |
| ATKINS PLANNING & MANAGEMENT CONSULTANTS LIMITED | 00819139 | 05/07/1999 | 09/12/1999 | Dissolved |
| ATKINSRÉALIS UK INTERNATIONAL LIMITED | 01091953 | 05/04/1993 | 31/10/2002 | Silver |
| ATKINSRÉALIS UK LIMITED | 00688424 | 05/07/1999 | 31/10/2002 | Silver |
| C G C International Group Plc | 01064932 | 17/10/1991 | 31/01/1992 | Dissolved |
| C G C Tucker Associates Ltd | 02102671 | 01/03/1991 | 31/01/1992 | Dissolved |
| CIRIA SERVICES LIMITED | 03821362 | 05/01/2007 | 31/05/2016 | Not Trading |
| CONSTRUCTION INDUSTRY RESEARCH AND INFORMATION ASSOCIATION | 00790505 | 30/06/2003 | 31/05/2016 | Amber |
| Cgc Management Ltd | 02007667 | 01/08/1991 | 31/01/1992 | Dissolved |
| E R I (Technology) Ltd | 02683469 | 12/02/1993 | 30/04/1997 | Dissolved |