| Company | Timeline | Status | |
| Highacre Grange Management Company Limited Director • Chartered Accountant | 26 Nov 2013←12 Years→Current | Active | |
| Detroit Music Limited Secretary • Unreported | 20 Mar 1996←3 Years→17 Jan 2000 | Active | |
| Martin Birch Investments Limited Director • Chartered Accountant | 1 Mar 1991←22 Years→18 Feb 2014 | Active | |
| Martin Birch Overseas Limited Director • Chartered Accountant | 1 Mar 1991←22 Years→18 Feb 2014 | Active | |
