| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ATKINSRÉALIS PPS LIMITED | 02236832 | 01/04/2010 | 15/07/2013 | Gold |
| ATKINSRÉALIS UK INTERNATIONAL LIMITED | 01091953 | 01/05/2007 | 15/07/2013 | Silver |
| PELL FRISCHMANN CONSULTANTS LIMITED | 01777946 | 01/06/2014 | 24/11/2016 | Silver |
| PELL FRISCHMANN CONSULTING ENGINEERS LTD. | 01213169 | 01/06/2014 | 24/11/2016 | Amber |
| PELL FRISCHMANN LIMITED | 02750217 | 01/06/2014 | 24/11/2016 | Amber |
| PF CONSULTING GROUP LTD. | 04403030 | 01/06/2014 | 24/11/2016 | Gold |
| RSBG UK LTD | 09592767 | 30/09/2015 | 24/11/2016 | Silver |
| RSBGI LTD | 09592765 | 30/09/2015 | 24/11/2016 | Bronze |