| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BATH INDUSTRIAL HERITAGE TRUST LIMITED | 02269894 | 30/09/2019 | Gold |
| Dr Conservation Ltd | 02973783 | 04/10/1994 | Dissolved |
| Dr Conservation Ltd | 02973783 | 01/12/1995 | Dissolved |
| TEC BRISTOL LIMITED | 10558379 | 31/03/2017 | Gold |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AVON INDUSTRIAL BUILDINGS TRUST LIMITED | 01483387 | 12/07/1991 | 23/11/2021 | Gold |
| BATH INDUSTRIAL HERITAGE TRUST LIMITED | 02269894 | 24/06/2009 | 24/09/2018 | Gold |
| DOROTHEA RESTORATIONS LIMITED | 01874820 | 31/12/1991 | 01/03/2007 | Dissolved |
| HERITAGE IRONWORK TRUST LTD | 07021953 | 17/09/2009 | 16/09/2014 | Amber |
| THE NEWCOMEN SOCIETY FOR THE STUDY OF THE HISTORY OF ENGINEERING AND TECHNOLOGY | 00691545 | 01/10/2010 | 28/02/2017 | Silver |
| TRADITIONAL ENGINEERING COMPANY LIMITED | 05942442 | 07/02/2007 | 31/03/2017 | Silver |