| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Hutton & Rostran Data Processing Ltd | 01163996 | 14/06/1992 | Dissolved |
| Hutton + Rostron Partnership Ltd | 03578135 | 09/06/1998 | Dissolved |
| Maze Publications Limited | 01700622 | 14/06/1992 | Dissolved |
| Natural Stone Institute | SC236107 | 29/08/2003 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BM TRADA CERTIFICATION LIMITED | 02110046 | 22/08/1991 | 30/11/1995 | Not Trading |
| FUNGAL CONTROL SYSTEMS LIMITED | 02473882 | 23/02/1992 | 12/01/2010 | Dissolved |
| HUTTON + ROSTRON DATA EXCHANGE LIMITED | 02320150 | 21/11/1992 | 12/01/2010 | Dissolved |
| HUTTON + ROSTRON ENVIRONMENTAL INVESTIGATIONS LIMITED | 02319817 | 21/11/1992 | 12/01/2010 | Bronze |
| INSIGHT CERTIFICATION LIMITED | 02525516 | 25/07/1991 | 28/12/2000 | Gold |
| NETLEY PROPERTY LIMITED | 01884622 | 14/06/1992 | 01/06/2005 | Amber |
| SCOTTISH STONE LIAISON GROUP | SC205168 | 19/05/2000 | 06/03/2008 | Dissolved |