| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Q.E.D. Consultancy Services Ltd | SC153161 | 12/01/1995 | Dissolved |
| Q.E.D. International Ltd | SC122965 | 14/02/1990 | Dissolved |
| Q.E.D. Trommels Ltd | SC153159 | 12/01/1995 | Dissolved |
| Q.E.D. Wag Systems Ltd | SC153158 | 12/01/1995 | Dissolved |
| QUARRYING & ENGINEERING DEVELOPMENTS | SC086389 | 05/12/1988 | Dissolved |
| Quarrying & Engineering Developments International Limited | SC120591 | 04/10/1991 | Dissolved |
| R A M Environmental Services Ltd | SC135295 | 09/12/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Murray Walker Ltd | SC115538 | 11/01/1991 | 06/04/2007 | Dissolved |
| PLOCKTON HARBOUR CIC | SC335454 | 19/12/2007 | 02/12/2008 | Bronze |
| Q.E.D. SALES LIMITED | SC153160 | 12/01/1995 | 15/12/2005 | Dissolved |