| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BOHAPA GROUP LIMITED | 04764436 | 01/10/2024 | Amber |
| CARD GEOTECHNICS LIMITED | 02993862 | 06/02/2023 | Gold |
| CGL 2014 LIMITED | 08840267 | 06/02/2023 | Silver |
| CODE A WELD HOLDINGS LIMITED | 04217426 | 01/10/2024 | Silver |
| CODE A WELD INSPECTION LTD | 05865168 | 01/10/2024 | Amber |
| CODE A WELD LABORATORY LTD | 07237310 | 01/10/2024 | Silver |
| CODE A WELD NDT LTD | 09566727 | 01/10/2024 | Amber |
| CONCEPT ENGINEERING CONSULTANTS LTD | 03401367 | 06/02/2023 | Bronze |
| CONSTRUCTION TESTING SOLUTIONS GROUP HOLDINGS LIMITED | 05340145 | 06/02/2023 | Gold |
| CONSTRUCTION TESTING SOLUTIONS LIMITED | 05998333 | 06/02/2023 | Bronze |
| G.T. CERTIFICATION LIMITED | 04295617 | 06/02/2023 | Gold |
| IN SITU SITE INVESTIGATION LIMITED | 06339499 | 06/02/2023 | Gold |
| MASON EVANS PARTNERSHIP (HOLDINGS) LIMITED | SC330579 | 06/02/2023 | Amber |
| MASON EVANS PARTNERSHIP LIMITED | SC156317 | 06/02/2023 | Amber |
| N & C 1965 LIMITED | 02911898 | 06/02/2023 | Gold |
| NICHOLLS COLTON GROUP LIMITED | 05605955 | 06/02/2023 | Silver |
| NICHOLLS COLTON LIMITED | 07705902 | 06/02/2023 | Gold |
| PHENNA INFRASTRUCTURE UK LIMITED | 11627758 | 06/02/2023 | Silver |
| PROJECT C TOPCO LIMITED | 11623468 | 06/02/2023 | Silver |
| SILKSTONE ENVIRONMENTAL LIMITED | 03984219 | 06/02/2023 | Gold |
| THE TESTING GROUP LIMITED | 09430520 | 06/02/2023 | Amber |
| WANDER BIDCO LIMITED | 13048122 | 01/10/2024 | Bronze |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|