| Alan Methven Smith | Director | 5 May 1989 | 7 Apr 2000 | British | 80 years |
| Alan Methven Smith | Secretary | 5 May 1989 | 7 Apr 2000 | British | - |
| Andrew Robert Aikman | Director | N/A | 12 Dec 2024 | British | 72 years |
| Charles Ross Haston | Director | 11 Sept 2000 | 30 Sept 2010 | British | 63 years |
| Gordon Keir Affleck | Secretary | 25 Mar 2010 | 30 Sept 2022 | British | - |
| Gordon Keir Affleck | Director | 25 Mar 2010 | 31 Oct 2023 | British | 59 years |
| Hew Edward Ogilvy Balfour | Director | 1 Dec 1989 | 16 Feb 1994 | British | 73 years |
| Ian Gardner Louden Bulloch | Director | 5 May 1989 | 30 Apr 2010 | British | 78 years |
| Ian Gardner Louden Bulloch | Secretary | 7 Apr 2000 | 25 Mar 2010 | British | - |
| Joan Smith | Director | 5 May 1989 | 7 Apr 2000 | British | 78 years |
| John Campbell | Director | 1 Jul 2013 | 30 Sept 2022 | Scottish | 65 years |
| Mark Harvie | Director | 1 Jul 2013 | 30 Sept 2022 | Scottish | 65 years |
| Melville Allan Ramsay | Director | 5 May 1989 | 1 Mar 1991 | British | 83 years |
| Pam Flockhart | Director | 20 Jun 2022 | 12 Dec 2024 | British | 48 years |
| Peter Henry John De Vink | Director | 21 Jun 1990 | 5 Oct 1990 | Dutch | 85 years |
| Richard Smith | Director | 11 Sept 2000 | 30 Sept 2022 | British | 69 years |
| Ronald Melvin | Director | 1 Jul 2013 | 30 Sept 2022 | Scottish | 66 years |
| Thomas Flockhart | Director | 5 May 1989 | 2 May 2022 | British | 76 years |
| Valerie Flockhart | Director | 5 May 1989 | 31 Dec 2004 | British | 71 years |
| William Shields Henderson | Director | 1 Apr 2008 | 30 Sept 2021 | British | 84 years |