| Archibald Lamont | Director | 21 Apr 1989 | 30 Nov 2012 | British | 75 years |
| Archibald Lamont | Secretary | 17 Aug 2001 | 9 Aug 2002 | British | - |
| Carole Jean Cran | Director | 3 Jan 2018 | 8 Nov 2024 | British | 55 years |
| Charles Graham Hammond | Director | 9 Aug 2002 | 30 Jun 2024 | British | 64 years |
| Christopher John Staples | Director | 21 Apr 1989 | 9 Aug 2002 | British | 83 years |
| James Douglas Chalmers Barr | Director | 21 Apr 1989 | 31 Dec 1990 | British | 83 years |
| James Douglas Chalmers Barr | Secretary | 21 Apr 1989 | 31 Dec 1990 | British | - |
| James Patrick Hepburne Scott | Director | 21 Apr 1989 | 31 Dec 1990 | British | - |
| John Alan Tothill | Secretary | 9 Aug 2002 | 15 Mar 2005 | British | - |
| Lee Adams Hartley | Director | 1 Jan 1991 | 17 Aug 2001 | British | 64 years |
| Lee Adams Hartley | Secretary | 1 Jan 1991 | 17 Aug 2001 | British | - |
| Morag Mcneill | Secretary | 15 Mar 2005 | 31 Aug 2012 | British | - |
| Stuart Randall Paterson | Director | 6 Apr 2011 | 3 Jan 2018 | British | 67 years |
| William Wilson Murray | Director | 9 Aug 2002 | 6 May 2011 | British | 74 years |