| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ECOSAL UK | 08652326 | 15/08/2013 | One Red Flag |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASSOCIATION FOR INDUSTRIAL ARCHAEOLOGY | 01326854 | 08/09/1996 | 06/09/1998 | Gold |
| COUNCIL FOR BRITISH ARCHAEOLOGY(THE) | 01760254 | 26/09/1998 | 25/09/1999 | Bronze |
| HISTORICAL METALLURGY SOCIETY LIMITED(THE) | 01442508 | 15/05/2004 | 18/05/2024 | Silver |
| HISTORICAL METALLURGY SOCIETY LIMITED(THE) | 01442508 | 14/06/2008 | 17/06/2017 | Silver |
| SOCIETY FOR POST-MEDIEVAL ARCHAEOLOGY LIMITED(THE) | 01477528 | 23/09/2000 | 01/10/2006 | Gold |
| SOCIETY FOR POST-MEDIEVAL ARCHAEOLOGY LIMITED(THE) | 01477528 | 30/09/2006 | 03/10/2009 | Gold |