| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Chagvale Securities Ltd | 01300489 | 09/04/1997 | Dissolved |
| Costain Hellas Ltd | 01649802 | 09/04/1997 | Dissolved |
| Costain,Richard,Properties Ltd | 00759410 | 09/04/1997 | Dissolved |
| Country & District Estates Ltd | 00865721 | 09/04/1997 | Dissolved |
| County & District Properties (London) Ltd | 01508962 | 09/04/1997 | Dissolved |
| County & District Properties (Middlesbrough) Ltd | 00721952 | 09/04/1997 | Dissolved |
| County & District Properties (Southern) Ltd | 00721953 | 09/04/1997 | Dissolved |
| Exeter & Devon Estates Co Ltd (The) | 00280641 | 09/04/1997 | Dissolved |
| M L M Property Co Ltd | 00664335 | 09/04/1997 | Dissolved |
| Project Control Services Ltd | 01994158 | 09/04/1997 | Dissolved |
| Toplis Painters Ltd | 00715340 | 09/04/1997 | Dissolved |
| Turney's Quay (Nottingham) Limited | 01910952 | 09/04/1997 | Dissolved |
| Westward Land & Property Co Ltd | 01243563 | 09/04/1997 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| A.STREETER & CO.LIMITED | 00119935 | 09/04/1997 | 15/12/1998 | Dissolved |
| CHANNEL TUNNEL RAIL LINK LIMITED | 02315379 | 23/08/1993 | 08/04/1997 | Dissolved |
| COSTAIN INVESTMENTS LIMITED | FC011859 | 09/04/1997 | 30/06/2001 | Amber |
| Charles Astor & Co Ltd | 00441569 | 09/04/1997 | 15/12/1998 | Dissolved |
| Costain Renovations Ltd | 00290471 | 09/04/1997 | 15/12/1998 | Dissolved |
| Dolphin Development Co (Greece)ltd | 00563276 | 09/04/1997 | 07/05/1997 | Dissolved |
| Forth Crossings Ltd | SC141529 | 04/01/1993 | 25/10/1993 | Dissolved |
| Home & Commercial Securities Ltd | 01130994 | 09/04/1997 | 15/12/1998 | Dissolved |
| JOHN LAING CONSTRUCTION LIMITED | 00172161 | 31/05/1992 | 31/05/1993 | Silver |
| JOHN LAING INTERNATIONAL LIMITED | 00623253 | 31/05/1991 | 31/05/1993 | Amber |
| LAING PROJECTS (UK) LIMITED | 00685731 | 31/05/1991 | 31/05/1993 | Insolvent |
| MAJOR PROJECTS ASSOCIATION | 02157656 | 25/01/1994 | 29/11/2004 | Bronze |
| Renown Investments Ltd | 00699895 | 09/04/1997 | 15/12/1998 | Dissolved |
| SPITALFIELDS DEVELOPMENTS LIMITED | 02025411 | 08/04/1997 | 12/09/1997 | Not Trading |
| SPITALFIELDS HOLDINGS LIMITED | 02268187 | 08/04/1997 | 12/09/1997 | Gold |
| Streeters of Godalming Ltd | 00824825 | 09/04/1997 | 15/12/1998 | Dissolved |
| Tiltpledge Ltd | 02283218 | 08/04/1997 | 12/09/1997 | Dissolved |