| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Acer Butler & Chappell Ltd | 01859690 | 29/12/2000 | Dissolved |
| Acer Icf Ltd | 02534052 | 29/12/2000 | Dissolved |
| Acer Services Ltd | 02220702 | 29/12/2000 | Dissolved |
| Altwell Ltd | 01691929 | 29/12/2000 | Dissolved |
| CLARKES OF STILLINGTON LIMITED | 00422447 | 21/10/2002 | Dissolved |
| Engineering Geology Ltd | 00960681 | 29/12/2000 | Dissolved |
| G.M.F. (Developments) Ltd | 01367895 | 21/10/2002 | Dissolved |
| G.M.F. (Machinery) Ltd | 01045935 | 21/10/2002 | Dissolved |
| G.M.F. (Metalforming) Ltd | 01164820 | 21/10/2002 | Dissolved |
| Gmf (Investments) Ltd | 01164207 | 21/10/2002 | Dissolved |
| HYDER CONSULTING OVERSEAS LIMITED | 02690216 | 29/12/2000 | Dissolved |
| Hcl(No.1) Ltd | 02162463 | 29/12/2000 | Dissolved |
| Hyder Engineering Ltd | 02452906 | 29/12/2000 | Dissolved |
| James E Robertson & Sons Ltd | SC041395 | 21/10/2002 | Dissolved |
| Maple Processes Ltd | 02562121 | 29/12/2000 | Dissolved |
| Spartan Redheugh Holdings Ltd | 01781596 | 21/10/2002 | Dissolved |
| Spartan Redheugh Trading Ltd | 01888533 | 21/10/2002 | Dissolved |
| Tecnecon Ltd | 01868909 | 29/12/2000 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ACER JOHN TAYLOR LIMITED | 01348874 | 29/12/2000 | 30/09/2008 | Dissolved |
| ACER PARTNERSHIPS LIMITED | 02561362 | 29/12/2000 | 30/09/2008 | Dissolved |
| ACER SIR BRUCE WHITE LIMITED | 02560699 | 29/12/2000 | 30/09/2008 | Dissolved |
| ARCADIS CONSULTING (UK) LIMITED | 02212959 | 29/12/2000 | 30/09/2008 | Silver |
| ARCADIS CONSULTING EUROPE LIMITED | 02273559 | 29/12/2000 | 30/09/2008 | Silver |
| ARCADIS CONSULTING GROUP LIMITED | 02115472 | 29/12/2000 | 30/09/2008 | One Red Flag |
| ASHACT LIMITED | 03860676 | 06/08/2004 | 30/09/2008 | Dissolved |
| BTP (1992) LIMITED | 02387786 | 31/07/2006 | 30/09/2008 | Dissolved |
| CRESSWELL ASSOCIATES (ENVIRONMENTAL CONSULTANTS) LIMITED | 02282693 | 22/03/2006 | 30/09/2008 | Dissolved |
| HYDER 1 LIMITED | 02480999 | 29/12/2000 | 30/09/2008 | Dissolved |
| HYDER CONSULTING OVERSEAS HOLDINGS LIMITED | 04723408 | 08/04/2003 | 30/09/2008 | Amber |
| HYDER CONSULTING OVERSEAS LIMITED | 03745578 | 06/04/2006 | 30/09/2008 | Insolvent |
| MARCUS HODGES ENVIRONMENT LIMITED | 00616332 | 08/09/2004 | 30/09/2008 | Dissolved |
| RPA QUANTITY SURVEYORS LIMITED | 03495060 | 23/04/2007 | 30/09/2008 | Dissolved |