| Company | Timeline | Status | |
| The Glasgow Agricultural Society Director • Retired | 2 May 2006←6 Years→11 Dec 2012 | Active | |
| Thomas Clark & Sons Limited Director • Farmer | 12 Nov 2003←16 Years→22 Nov 2019 | Active | |
| Thomas Clark & Sons Limited Secretary • Unreported | 12 Nov 2003←16 Years→22 Nov 2019 | Active | |
| The Clydesdale Horse Society Director • Retired Farmer | 31 Mar 2000←16 Years→25 Mar 2017 | Active | |
