| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AM HOLDCO LIMITED | 06387403 | 30/05/2013 | Amber |
| BEIF II CORPORATE SERVICES LIMITED | 07002591 | 28/03/2014 | Dissolved |
| BIIF BIDCO LIMITED | 06704479 | 28/03/2014 | Amber |
| BIIF HOLDCO II LIMITED | 07557655 | 28/03/2014 | Silver |
| BIIF HOLDCO III LIMITED | 08232095 | 28/03/2014 | Bronze |
| BIIF ISSUERCO LIMITED | 06590759 | 28/03/2014 | Amber |
| BIIF PARENTCO LIMITED | 06704777 | 28/03/2014 | Silver |
| DURHAM INVESTMENTS HOLDCO LIMITED | 06492287 | 14/10/2009 | Silver |
| ELBON PFI FUND (INVESTMENTS) LIMITED | 04196287 | 30/05/2013 | Bronze |
| ERI HOLDINGS LIMITED | 06452349 | 14/10/2009 | Silver |
| INTERNATIONAL WATER (HIGHLANDS) LIMITED | 03199060 | 01/11/2013 | Silver |
| INTERNATIONAL WATER (TAY) LIMITED | 03424414 | 01/11/2013 | Silver |
| IWL MORAY MONTROSE LIMITED | 03639312 | 01/11/2013 | Silver |
| IWUUHH LIMITED | 06776827 | 01/11/2013 | Silver |
| NUFFIELD ALBION HEALTHCARE LIMITED | 04176082 | 30/05/2013 | Bronze |
| RENO (HIGHLAND) LIMITED | 03131188 | 01/11/2013 | Amber |
| TIS GROUP HOLDINGS LIMITED | 06385473 | 08/03/2013 | Dissolved |
| TIS INVESTMENTS LIMITED | 06436243 | 08/03/2013 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) HOLDINGS LIMITED | 04017593 | 08/03/2013 | Dissolved |
| TRAFFIC INFORMATION SERVICES (TIS) LIMITED | 04017551 | 08/03/2013 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| HOUNSLOW HIGHWAYS INVESTMENT 2 LIMITED | 08114902 | 24/06/2014 | 23/04/2024 | Amber |
| HOUNSLOW HIGHWAYS INVESTMENT LIMITED | 08113663 | 24/06/2014 | 23/04/2024 | Bronze |
| HOUNSLOW HIGHWAYS SERVICES LIMITED | 08114900 | 24/06/2014 | 23/04/2024 | Bronze |