| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| AECOM PENSION TRUSTEE LIMITED | 09918247 | 01/02/2017 | Not Trading |
| GROUND SOLUTIONS GROUP LTD | 02036076 | 02/01/2008 | Dissolved |
| HYDROGEOLOGICAL SERVICES INTERNATIONAL LIMITED | 02495374 | 02/01/2008 | Dissolved |
| INFRASTRUCTURE DESIGN GROUP LIMITED | 03033260 | 02/01/2008 | Dissolved |
| KNIGHT PIESOLD LTD | 02778092 | 08/05/1998 | Dissolved |
| MASCOTT LIMITED | 01814878 | 01/02/1995 | Dissolved |
| OCEANS ENGINEERING LIMITED | 03039133 | 31/07/2004 | Dissolved |
| SCOTT NEALE & PARTNERS LIMITED | 02468007 | 01/05/1998 | Dissolved |
| SCOTT WILSON MAINLINE LTD. | 02952556 | 16/11/1995 | Dissolved |
| SCOTT WILSON PAVEMENT ENGINEERING LTD | 01910469 | 15/04/2008 | Dissolved |
| SCOTT WILSON RAILWAYS (SCOTLAND) LIMITED | SC164577 | 01/11/2002 | Dissolved |
| SW2 HIGHWAYS LTD | 02761504 | 01/10/2008 | Dissolved |
| SWK LIMITED | 02467863 | 01/05/1995 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AECOM CORPORATION HOLDINGS (UK) LIMITED | 03039328 | 29/03/1995 | 10/09/2010 | Bronze |
| AECOM INFRASTRUCTURE & ENVIRONMENT UK LIMITED | 00880328 | 01/05/1995 | 10/09/2010 | Gold |
| ASSOCIATION FOR CONSULTANCY AND ENGINEERING | 00132142 | 04/12/2007 | 30/11/2010 | Silver |
| BASING VIEW INVESTMENTS LTD | 03022390 | 31/01/1996 | 30/04/2004 | Insolvent |
| HR WALLINGFORD GROUP LIMITED | 01622174 | 01/01/2017 | 31/03/2022 | Silver |
| NEXUS INFRASTRUCTURE PLC | 05635505 | 01/01/2016 | 31/12/2021 | Silver |
| REDR UK | 03929653 | 25/11/2014 | 21/10/2020 | Bronze |
| SCOTT WILSON (REDTREE) LTD | 01135304 | 01/05/2002 | 30/03/2011 | Dissolved |
| SCOTT WILSON PIESOLD LTD | 02894693 | 25/11/2002 | 11/02/2013 | Dissolved |
| SCOTT WILSON RAILWAYS LTD | 03033277 | 18/08/1995 | 30/03/2011 | Not Trading |
| SW2 HIGHWAYS LTD | 02761504 | 08/05/1998 | 14/05/2008 | Dissolved |
| THOMAS TELFORD LIMITED | 02556636 | 12/12/2012 | 22/10/2013 | Amber |
| URS CORPORATION GROUP LIMITED | 05639381 | 29/11/2005 | 10/09/2010 | One Red Flag |