| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| HALCROW FOUNDATION | 05593409 | 14/10/2005 | Silver |
| MACHIR LIMITED | 09712167 | 31/07/2015 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRITISH EXPERTISE | 00896430 | 09/02/2012 | 10/09/2012 | Amber |
| BURDEROP INVESTMENTS LIMITED | 02485284 | 09/01/2002 | 17/08/2012 | Dissolved |
| HALCROW CONSULTING LIMITED | 02326761 | 15/06/2004 | 17/08/2012 | One Red Flag |
| HALCROW FOX AND ASSOCIATES LIMITED | 00816972 | 31/01/1992 | 21/08/2012 | Dissolved |
| HALCROW GROUP LIMITED | 03415971 | 01/03/2000 | 17/08/2012 | Amber |
| HALCROW HOLDINGS LIMITED | 01674044 | 01/01/2001 | 10/11/2011 | One Red Flag |
| HALCROW INTERNATIONAL LIMITED | 02326765 | 07/02/2002 | 17/08/2012 | Amber |
| MECHANICAL AND ELECTRICAL DESIGN ASSOCIATES LIMITED | 00878811 | 29/01/2008 | 17/08/2012 | Dissolved |
| MIDDLESEX YOUNG PEOPLE'S CLUBS | 03496561 | 06/02/2002 | 31/03/2004 | Dissolved |
| SERENA MANSIONS LIMITED | 00806619 | 20/05/2009 | 19/01/2021 | Bronze |
| SIR WILLIAM HALCROW & PARTNERS LIMITED | 01722541 | 21/12/2004 | 17/08/2012 | Dissolved |
| TRANSMARK ASIA LIMITED | 02815214 | 09/01/2002 | 14/11/2011 | One Red Flag |
| YOLLES PARTNERSHIP LIMITED | 02333623 | 30/06/2005 | 17/08/2012 | Dissolved |