| Company | Timeline | Status | |
| Dove Marine Limited Director • Chartered Surveyor | 4 Sep 2000←25 Years→Current | Active | |
| Diet North Limited Secretary • Unreported | 9 Nov 1999←24 Years→30 Jan 2024 | Dissolved | |
| J.H.Cowper Investments Limited Director • Chartered Surveyor | 29 Jun 1991←34 Years→Current | Active | |
| Tyneside Estate Office Limited Director • Chartered Surveyor | 29 Jun 1991←34 Years→Current | Active | |
| J.H.Cowper Investments Limited Secretary • Unreported | 29 Jun 1991←2 Years 3 Months→27 Sep 1993 | Active | |
| Tyneside Estate Office Limited Secretary • Unreported | 29 Jun 1991←2 Years 3 Months→27 Sep 1993 | Active | |
