| Company | Timeline | Status | |
| Gardiner Richardson Limited Director • Retired | 2 Jan 2007←12 Years→1 Sep 2019 | Active | |
| Caledonian Environmental Services Plc Director • Commercial Director | 30 Apr 1999←2 Months→23 Jul 1999 | Active | |
| Gardiner Richardson Limited Director • Retired | 29 Dec 1997←9 Years→2 Jan 2007 | Active | |
| Northumbrian Water Projects Limited Director • Civil Engineer | 21 May 1996←3 Years→1 Jun 1999 | Active | |
| Shankland Cox Limited Director • Civil Engineer | 2 Feb 1993←1 Year 12 Months→31 Jan 1995 | Active | |
| ULG International Limited Director • Civil Engineer | 2 Feb 1993←1 Year 12 Months→31 Jan 1995 | Active | |
Entec Europe Limited Director • Unreported | 25 Jun 1992←1 Year 6 Months→31 Dec 1993 | Dissolved | |
