| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| 00491501 LIMITED | 00491501 | 07/01/2008 | One Red Flag |
| Alluvial Mining (U K) Ltd | 01328992 | 07/01/2008 | Dissolved |
| BOSKALIS MARINE CONTRACTING LIMITED | 00635649 | 23/04/2019 | One Red Flag |
| Boskalis-Keys Ltd | 01450309 | 07/01/2008 | Dissolved |
| HAKA U.K. LIMITED | SC109437 | 07/01/2008 | Dissolved |
| LONDON DREDGING COMPANY LIMITED | SC032081 | 07/01/2008 | Dissolved |
| OSIRIS SEAWAY LIMITED | 01933087 | 07/01/2008 | Dissolved |
| Osiris Cesco Ltd | 00923702 | 07/01/2008 | Dissolved |
| P.V.W. INTERNATIONAL DREDGING AND HARBOUR WORKS LIMITED | 03005393 | 07/01/2008 | Dissolved |
| Railside Engineering Ltd | 02451824 | 07/01/2008 | Dissolved |
| ZANEN DREDGING & CONTRACTING CO. LIMITED | 01415672 | 07/01/2008 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BKW TRUSTEE COMPANY LIMITED | 01252055 | 01/03/2008 | 14/03/2011 | Dissolved |
| BOSKALIS MARINE CONTRACTING LIMITED | 00635649 | 07/01/2008 | 11/03/2011 | One Red Flag |
| BOSKALIS WESTMINSTER (HOLDINGS) LIMITED | 00282243 | 07/01/2008 | 11/03/2011 | Bronze |
| BOSKALIS WESTMINSTER CONSTRUCTION LIMITED | 00407906 | 07/01/2008 | 11/03/2011 | Dissolved |
| BOSKALIS WESTMINSTER LIMITED | 00745328 | 06/09/2009 | 11/03/2011 | Bronze |
| BOSKALIS ZINKCON LIMITED | 02350942 | 07/01/2008 | 11/03/2011 | Dissolved |
| BRITANNIA AGGREGATES LIMITED | 02304376 | 31/12/2008 | 18/04/2011 | Amber |
| BWCRBS TRUSTEE COMPANY LIMITED | 03334038 | 04/02/2008 | 14/03/2011 | Dissolved |
| COASTAL AGGREGATES LIMITED | 03201157 | 31/12/2008 | 11/03/2011 | Dissolved |
| CORTEND LIMITED | 01196343 | 31/12/2008 | 11/03/2011 | Dissolved |
| HOLLAND DREDGING COMPANY (U.K.) LIMITED | 01291439 | 07/01/2008 | 11/03/2011 | Dissolved |
| JAMES CONTRACTING & SHIPPING CO.,LIMITED | 00128325 | 07/01/2008 | 11/03/2011 | Dissolved |
| LLANELLI SAND DREDGING LIMITED | 00338917 | 07/01/2008 | 11/03/2011 | Bronze |
| MARCHWOOD WHARFAGE LIMITED | 03201164 | 31/12/2008 | 11/03/2011 | Dissolved |
| NORTHWOOD(FAREHAM)LIMITED | 00576518 | 31/12/2008 | 11/03/2011 | Dissolved |
| PEVENSEY COASTAL DEFENCE LIMITED | 03776520 | 16/07/2010 | 11/03/2011 | Silver |
| R.W. AGGREGATES LIMITED | 03166538 | 31/12/2008 | 11/03/2011 | Dissolved |
| WESTMINSTER DREDGING COMPANY LIMITED | 01647790 | 07/01/2008 | 11/03/2011 | Gold |
| WESTMINSTER DREDGING/VAN OORD ACZ JOINT VENTURE LIMITED | 03887089 | 07/01/2008 | 11/03/2011 | Dissolved |
| WESTMINSTER GRAVELS LIMITED | 02380267 | 07/01/2008 | 11/03/2011 | Silver |