| Company | Timeline | Status | |
| Castle Howard Arboretum Trust Director • Landowner | 23 Jun 1997←5 Years→31 Oct 2002 | Active | |
| Yorkshire Agricultural Society Director • Landowner | 4 May 1995←8 Months→1 Jan 1996 | Active | |
| Plant Heritage Director • Publishing Estate Management | 8 Apr 1992←2 Years→4 May 1994 | Active | |
