| Company | Timeline | Status | |
| Wallingford Systems Limited Director • Chartered Civil Engineer | 5 May 1993←2 Years 5 Months→26 Oct 1995 | Active | |
First Engineering Limited Director • Chartered Civil Engineer | 8 Nov 1991←3 Years→31 Aug 1995 | Dissolved | |
| HR Wallingford Group Limited Director • Chartered Civil Engineer | 4 Oct 1991←4 Years→20 Nov 1995 | Active | |
