| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ARCHITECTURAL INSIGHT LIMITED | 05917473 | 01/09/2008 | Dissolved |
| Halcrow (Offshore) | 01453599 | 15/11/1991 | Dissolved |
| Halcrow Gulf Ltd | 02616368 | 10/02/1998 | Dissolved |
| Halcrow-Ewbank Petroleum Offshore Engineering Co | 01225611 | 01/12/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| HAFREN POWER LIMITED | 07358260 | 13/09/2012 | 23/01/2014 | Gold |
| HALCROW (CONSULTING ENGINEERS & ARCHITECTS) LIMITED | 01045458 | 10/02/1998 | 31/07/2007 | Amber |
| HALCROW GROUP LIMITED | 03415971 | 03/04/1998 | 31/07/2007 | Amber |
| HALCROW HOLDINGS LIMITED | 01674044 | 01/01/2001 | 31/07/2007 | One Red Flag |
| HALCROW RAIL APPROVALS LIMITED | 05079753 | 30/09/2004 | 31/07/2007 | Dissolved |
| HALCROW STAFF AND SERVICES | 01193727 | 07/01/2002 | 05/09/2002 | Dissolved |
| HALCROW WATER SERVICES LIMITED | 03055857 | 06/12/2002 | 24/06/2005 | Dissolved |
| SIR WILLIAM HALCROW & PARTNERS LIMITED | 01722541 | 15/11/1991 | 31/07/2007 | Strike Off |