| Company | Timeline | Status | |
| Interserve Trustees Limited Director • Civil Engineer (retired) | 1 Jan 2007←6 Years→31 Dec 2012 | Active | |
| Browning Pfi Holdings Limited Director • Civil Engineer | 10 Dec 2003←12 Months→8 Dec 2004 | Active | |
| Interserve Investments Limited Director • Civil Engineer | 10 Dec 2003←12 Months→8 Dec 2004 | Liquidation | |
| Newcastle Estate Partnership Holdings Limited Director • Civil Engineer | 24 Aug 2001←3 Years→15 Dec 2004 | Active | |
| The Newcastle Estate Partnership Limited Director • Civil Engineer | 24 Aug 2001←3 Years→15 Dec 2004 | Active | |
| Whittle Contracts Limited Director • Civil Engineer | 24 May 1999←5 Years→1 Apr 2005 | Dissolved | |
| Squires Gate Management Company Limited Director • Civil Engineer | 1 Aug 1996←29 Years→Current | Active | |
| Tilbury Douglas Construction Limited Director • Civil Engineer | 2 Jan 1992←13 Years→1 Apr 2005 | Active | |
| R.M. Douglas Construction Limited Director • Civil Engineer | 1 Oct 1991←5 Years→30 Oct 1996 | Liquidation | |
R.M. Douglas Asphalt & Paving Limited Director • Civil Engineer | 1 Oct 1991←6 Years→29 Sep 1997 | Liquidation | |
