| Company | Timeline | Status | |
| Birtwistle Investments Limited Director • Chartered Surveyor  | 22 Sep 2003←22 Years→Current  | Active  | |
| Lower Park Marina Ltd Director • Chartered Surveyor  | 2 Feb 1995←30 Years→Current  | Active  | |
| Lower Park Marina Ltd Director • Chartered Surveyor  | 2 Feb 1995←29 Years→13 Aug 2024  | Active  | |
