| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BIRCHWOOD PLANT HIRE LIMITED | 09922932 | 18/12/2015 | Bronze |
| DEEP SOIL MIXING LTD | 08187012 | 21/08/2012 | Bronze |
| DEEP SOIL MIXING TECHNICAL SERVICES LTD | 09963066 | 21/01/2016 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CPM GROUP LIMITED | 01005164 | 22/03/1994 | 17/01/1997 | Silver |
| DAWSON PILING LIMITED | 01868349 | 20/10/1998 | 06/07/2007 | Not Trading |
| DAWSON-WAM LTD | 01868307 | 23/10/1992 | 06/07/2007 | Gold |
| ECO FOUNDATIONS LIMITED | 06253648 | 19/06/2007 | 22/06/2012 | Dissolved |