| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Cetec Analytical Services Ltd | 03559437 | 16/01/2004 | Dissolved |
| Crozier & Wyatt (Southern) Ltd | 01531468 | 04/12/2003 | Dissolved |
| Pearce Edmunds & Partners Ltd | 02441558 | 04/12/2003 | Dissolved |
| Somershire Limited | 02317516 | 04/12/2003 | Dissolved |
| White Young Consulting Engineers Ltd | 02094071 | 25/09/1992 | Dissolved |
| White Young Engineering Consutants | 01498307 | 04/12/2003 | Dissolved |
| White Young Engineering Services Ltd | 01950292 | 04/12/2003 | Dissolved |
| White Young Prentice Royle Ltd | 01227295 | 04/12/2003 | Dissolved |
| White Young Project Engineering Ltd | 01185555 | 04/12/2003 | Dissolved |
| White Young Project Management Ltd | 01957698 | 01/04/1999 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| 14000 & ONE SOLUTIONS LIMITED | 03745047 | 02/01/2001 | 17/09/2007 | Dissolved |
| CETEC CONSULTANCY LIMITED | 02229584 | 16/01/2004 | 17/09/2007 | Dissolved |
| CETEC PROJECTS LIMITED | 04489836 | 16/01/2004 | 17/09/2007 | Dissolved |
| DOY WEBSTER (HOLDINGS) LIMITED | 03175043 | 01/11/2005 | 17/09/2007 | Dissolved |
| DOY WEBSTER CAD SERVICES LIMITED | 02694700 | 01/11/2005 | 17/09/2007 | Dissolved |
| DOY WEBSTER PARTNERSHIP LIMITED | 03023030 | 01/11/2005 | 17/09/2007 | Dissolved |
| DWP CONSULTING LIMITED | 03682096 | 15/06/2004 | 17/09/2007 | Dissolved |
| ERNEST GREEN PARTNERSHIP LIMITED | 01871269 | 21/07/1997 | 31/12/1997 | Dissolved |
| FARNINGHAM MCCREADIE PARTNERSHIP LIMITED | SC209454 | 28/03/2006 | 17/09/2007 | Dissolved |
| FISHER WILSON PLANNING LIMITED | 03753182 | 25/09/2001 | 17/09/2007 | Dissolved |
| HAWTHORNE KAMM LIMITED | 02066641 | 28/05/2004 | 17/09/2007 | Dissolved |
| IMC CONSULTING ENGINEERS LIMITED | 03639972 | 11/06/2004 | 17/09/2007 | Dissolved |
| IMC TECHNICAL SERVICES LIMITED | 03171053 | 11/06/2004 | 17/09/2007 | Dissolved |
| INTERNATIONAL ECONOMIC & ENERGY CONSULTING LIMITED | 02281002 | 11/06/2004 | 17/09/2007 | Dissolved |
| M V M PLANNING LIMITED | 02195804 | 30/04/2001 | 17/09/2007 | Dissolved |
| ROBERT LONG CONSULTANCY LIMITED | 02354955 | 28/02/2005 | 17/09/2007 | Dissolved |
| TETRA TECH ENVIRONMENT PLANNING TRANSPORT LIMITED | 03050297 | 16/10/1997 | 17/09/2007 | Not Trading |
| TETRA TECH INTERNATIONAL DEVELOPMENT PROJECTS LIMITED | 03195423 | 11/06/2004 | 17/09/2007 | Silver |
| TETRA TECH LIMITED | 01959704 | 15/12/1992 | 17/09/2007 | Silver |
| TETRA TECH MANAGEMENT SERVICES LIMITED | 04807864 | 28/03/2006 | 17/09/2007 | Not Trading |
| TETRA TECH UK CONSULTING GROUP LIMITED | 01869543 | 21/07/1997 | 17/09/2007 | Silver |
| TILNEY SIMMONS LIMITED | 02077186 | 06/10/1999 | 17/09/2007 | Dissolved |
| TILNEY, SIMMONS (INTERNATIONAL) LIMITED | 01970127 | 06/10/1999 | 17/09/2007 | Dissolved |
| TP MANAGEMENT LTD | 02269900 | 28/03/2006 | 17/09/2007 | Dissolved |
| TRENCH FARROW LIMITED | 01433914 | 20/10/2006 | 17/09/2007 | Amber |
| TURNER HOLDEN LIMITED | 04404446 | 02/02/2007 | 17/09/2007 | Dissolved |
| TWEEDS PROJECT SERVICES LTD. | 03033165 | 28/03/2006 | 17/09/2007 | Dissolved |
| WASTE MANAGEMENT RESEARCH LIMITED | 03239828 | 28/02/2005 | 17/09/2007 | Dissolved |
| WHITE YOUNG GREEN INTERNATIONAL LIMITED | 03734619 | 11/04/2000 | 17/09/2007 | Not Trading |
| WHITE YOUNG GREEN LIMITED | 05111508 | 11/05/2004 | 17/09/2007 | Not Trading |
| WHITE YOUNG TRUSTEE LIMITED | 02579388 | 25/09/1992 | 17/09/2007 | Dissolved |
| WYG 22 LIMITED | 03076421 | 10/11/2006 | 17/09/2007 | Dissolved |
| WYG INTERNATIONAL LIMITED | 03195485 | 11/06/2004 | 17/09/2007 | Dissolved |
| WYN THOMAS LIMITED | 02380011 | 01/07/2005 | 17/09/2007 | Dissolved |
| WYNTHOMASGORDONLEWIS LIMITED | 03837186 | 28/02/2005 | 17/09/2007 | Dissolved |