| Company | Timeline | Status | |
| Antiquities Dealers' Association Director • Numismatist | 19 May 2022←3 Years→Current | Active | |
| Trent Park Equestrian Centre Limited Director • Unreported | 14 May 2002←23 Years→Current | Active | |
| Trent Park Equestrian Centre Limited Secretary • Unreported | 14 May 2002←23 Years→Current | Active | |
| British Numismatic Trade Association Limited(The) Director • Unreported | 19 Jul 1995←30 Years→Current | Active | |
| Datadene Limited Director • Director | 15 Aug 1991←18 Years→30 Nov 2009 | Dissolved | |
| C.J. Martin (Coins) Limited Director • Unreported | 1 Jan 1970←55 Years→Current | Active | |
