| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Brooks & Sons (Instruments) Ltd | 00708418 | 19/12/1991 | Dissolved |
| Merz & McLellan Services Ltd | 00496012 | 01/11/1991 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ENERGISE I.T. LIMITED | 04019852 | 07/10/2003 | 20/01/2005 | Dissolved |
| HEDLEY PURVIS GROUP LIMITED | 04125901 | 01/01/2001 | 20/01/2005 | Dissolved |
| HEDLEY PURVIS HOLDINGS LIMITED | 05067559 | 11/05/2004 | 20/01/2005 | Dissolved |
| HEDLEY PURVIS INTERNATIONAL LIMITED | 04126331 | 01/01/2001 | 20/01/2005 | Dissolved |
| HEDLEY PURVIS VENTURES LIMITED | 04125919 | 01/01/2001 | 20/01/2005 | Dissolved |
| HYDRATIGHT OPERATIONS LIMITED | 01385259 | 02/03/2000 | 20/01/2005 | Strike Off |
| MERZ AND MCLELLAN CONSULTING ENGINEERS LIMITED | 03246982 | 01/07/1997 | 18/07/2000 | Dissolved |
| MERZ AND MCLELLAN LIMITED | 03627022 | 12/10/1998 | 18/07/2000 | Dissolved |
| Merz & McLellan Properties Ltd | 00123950 | 22/02/1992 | 16/02/1996 | Dissolved |
| Merz Associates Ltd | 00659850 | 12/05/1998 | 18/07/2000 | Dissolved |
| Merz Orchard Ltd | 00707372 | 14/08/1991 | 10/08/1992 | Dissolved |
| Merz Orchard Ltd | 00707372 | 10/08/1992 | 16/02/1996 | Dissolved |
| PARSONS BRINCKERHOFF HOLDINGS LIMITED | 03640733 | 01/10/1998 | 29/06/2000 | Dissolved |
| PARSONS BRINCKERHOFF LTD | 02554514 | 01/11/1991 | 16/02/1996 | Bronze |
| PB LTD | 00656314 | 18/06/1999 | 21/03/2000 | Not Trading |
| Parsons Brinckerhoff (Europe) Ltd | 02887298 | 13/06/1995 | 16/02/1996 | Dissolved |
| Parsons Brinckerhoff Group Services Ltd | 03815592 | 12/10/1999 | 06/03/2000 | Dissolved |
| Pb Power Holdings Ltd | 02560063 | 19/11/1991 | 16/02/1996 | Dissolved |
| QUEEN'S HALL ARTS | 03929839 | 02/03/2000 | 20/03/2006 | Amber |
| TNEI SERVICES LIMITED | 03891836 | 11/02/2000 | 01/09/2000 | Gold |
| The Northern Energy Initiative | 03207357 | 01/09/2000 | 22/02/2002 | Dissolved |