| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CANNISTER HALL BARNS LIMITED | 07945640 | 10/02/2012 | One Red Flag |
| CANNISTER HALL BARNS MANAGEMENT LIMITED | 07945705 | 10/02/2012 | Gold |
| CIGA LIMITED | 05724982 | 10/07/2017 | Not Trading |
| GTA (TRAINING) UK LIMITED | 08873671 | 03/02/2014 | Dissolved |
| THE INSTALLATION ASSURANCE AUTHORITY FEDERATION LIMITED | 15586507 | 08/05/2024 | Amber |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| GTA ENGLAND LIMITED | 07561609 | 06/02/2014 | 18/08/2016 | Silver |
| THE INSTALLATION ASSURANCE AUTHORITY LIMITED | 12483858 | 26/02/2020 | 09/11/2021 | Silver |
| WEST ANGLIA TRAINING ASSOCIATION LIMITED | 01273848 | 04/02/2014 | 16/09/2016 | Dissolved |
| WEST MIDLANDS CONSTRUCTION UTC | 07898669 | 28/08/2012 | 15/03/2013 | Dissolved |