| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| GRANTA CENTRE LIMITED | 04026422 | 01/02/2019 | Dissolved |
| GRANTA PARK LIMITED | 09373579 | 01/02/2019 | Dissolved |
| SURFLOW LIMITED | 11512928 | 01/02/2019 | Dissolved |
| TWI INTERNATIONAL LTD | 12435040 | 31/01/2020 | Dissolved |
| TWI RESEARCH CENTRE (CYMRU) LIMITED | 04896607 | 01/02/2019 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ABINGTON PARK LIMITED | 03587952 | 01/02/2019 | 01/05/2024 | Not Trading |
| FULLAGAR TECHNOLOGIES LIMITED | 10574265 | 20/01/2017 | 01/05/2024 | Gold |
| GPE 1 LIMITED | 09893328 | 01/02/2019 | 01/05/2024 | One Red Flag |
| GPE 2 LIMITED | 11896091 | 21/03/2019 | 01/05/2024 | One Red Flag |
| GRANTA ENTRANCE LIMITED | 07299156 | 01/02/2019 | 01/05/2024 | Bronze |
| GRANTA PARK ESTATES LIMITED | 02558329 | 01/02/2019 | 01/05/2024 | Bronze |
| NSIRC LIMITED | 08311437 | 01/02/2019 | 01/05/2024 | Not Trading |
| PLANT INTEGRITY LIMITED | 03341703 | 01/02/2019 | 01/05/2024 | Bronze |
| SIRF LIMITED | 08311440 | 01/02/2019 | 01/05/2024 | Not Trading |
| THE TEST HOUSE (CAMBRIDGE) LIMITED | 02513984 | 01/02/2019 | 01/05/2024 | One Red Flag |
| TWI CERTIFICATION LIMITED | 03108202 | 01/02/2019 | 01/05/2024 | Silver |
| TWI ESTATES LIMITED | 03203074 | 01/02/2019 | 01/05/2024 | Not Trading |
| TWI LIMITED | 03859442 | 01/02/2019 | 01/05/2024 | Gold |
| TWI TECHNOLOGY CENTRE (YORKSHIRE) LIMITED | 04456545 | 01/02/2019 | 01/05/2024 | Not Trading |
| WAVERLEY TECHNOLOGY LIMITED | 05248952 | 01/02/2019 | 01/05/2024 | Not Trading |