| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Brian Colquhoun & Partners Ltd | SC177261 | 30/09/1997 | Dissolved |
| Colquhoun Building Services Ltd | 02323143 | 04/06/1996 | Dissolved |
| Colquhoun Computing Ltd | 00477881 | 07/06/1996 | Dissolved |
| Colquhoun Geotechnical Services Ltd | 02348967 | 07/06/1996 | Dissolved |
| Colquhoun Transportation Planning Ltd | 02008327 | 07/06/1996 | Dissolved |
| Ensphere (U K) Ltd | SC108973 | 31/03/2000 | Dissolved |
| Grove & Wright Ltd | 01820197 | 25/07/1996 | Dissolved |
| Grove and Wright (West) Limited | 02289929 | 24/07/1996 | Dissolved |
| Services Document Reproduction Ltd | 00887093 | 07/06/1996 | Dissolved |
| Stressprobe Ltd | SC070466 | 31/05/1996 | Dissolved |
| THORBURN INVESTMENTS LIMITED | SC075199 | 31/03/2000 | Dissolved |
| Thorburn Colquhoun Environmental Ltd | SC157373 | 10/05/1996 | Dissolved |
| Thorburn Colquhoun Transportation Ltd | SC157372 | 10/05/1996 | Dissolved |
| Thorburn Colquhoun Trustees Ltd | SC151281 | 01/11/1999 | Dissolved |
| Total Data Management Ltd | SC178959 | 22/12/1999 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| B C P (1994) Ltd | SC148418 | 07/06/1996 | 25/09/2002 | Dissolved |
| Building Health Consultants Ltd | 02402452 | 07/06/1996 | 25/09/2002 | Dissolved |
| THORBURN COLQUHOUN HOLDINGS LIMITED | SC085696 | 01/05/1995 | 02/07/2002 | Not Trading |
| URS CORPORATION LIMITED | SC118271 | 01/11/2001 | 31/01/2002 | Gold |
| URS EUROPE LIMITED | 03678568 | 06/07/2000 | 31/01/2002 | Silver |
| WOODWARD-CLYDE LIMITED | SC136353 | 06/10/1992 | 02/07/2002 | Dissolved |