| Alexander James Marsh | Director | 31 Jan 1997 | 1 Jul 1997 | British | 87 years |
| Allan Keppie Smith | Director | 31 Jan 1997 | 18 May 1997 | British | 94 years |
| Andrew Patrick Kennedy | Secretary | 31 Jan 1997 | 1 Apr 1997 | British | - |
| Derek Malcolm Jones | Director | 19 Sept 2016 | 25 Nov 2024 | British | 55 years |
| Erik Alexander Steven Porter | Director | 12 Jul 1992 | 31 Jan 1997 | British | 87 years |
| Franco Martinelli | Director | 17 Dec 2014 | 19 Sept 2016 | British | 66 years |
| Godfrey Oliver Whitehead | Director | 12 Jul 1992 | 30 Apr 1993 | British | 85 years |
| Ilgi Kim | Director | 3 Dec 2024 | 27 Mar 2025 | British | 46 years |
| John Allen | Secretary | 12 Jul 1992 | 31 Jan 1997 | British | - |
| John David Taylor Greig | Secretary | 1 Apr 1997 | 1 Jun 2014 | Other | - |
| Julia Mary Wood | Secretary | 1 Jun 2014 | 28 Sept 2017 | - | - |
| Karen Louise Stewart | Director | 31 Mar 2018 | 31 Mar 2025 | British | 47 years |
| Mark William Hardy | Director | 19 Sept 2016 | 31 Mar 2018 | British | 69 years |
| Mark William Hardy | Director | 19 Sept 2016 | 31 Mar 2018 | British | 69 years |
| Martyn Robert Frost | Director | 12 Jul 1992 | 1 Dec 1994 | British | 76 years |
| Murray Simpson Easton | Director | 18 May 1997 | 31 May 2002 | British | 75 years |
| Nigel Robert Young | Director | 30 Jun 1998 | 30 Nov 2001 | British | 73 years |
| Peter Rose | Director | 7 Feb 1995 | 31 Jan 1997 | British | 68 years |
| Robert James Wetherall | Director | 12 Jul 1992 | 30 Jun 1994 | British | 83 years |
| Stanley Alan Royall Billiald | Secretary | 1 Mar 2004 | 1 Jul 2009 | Other | - |
| Timothy Michael Robert Pettigrew | Director | 20 Oct 2003 | 30 Jun 2016 | British | 59 years |
| Valerie Francine Anne Teller | Secretary | 1 Jul 2009 | 27 Jul 2012 | British | - |
| William Alan Cramond | Director | 31 Jan 1997 | 20 Oct 2003 | British | 70 years |
| William Mcewan Meir | Director | 31 Jan 1997 | 2 Nov 2001 | British | 78 years |
| William Tame | Director | 22 Jan 2002 | 17 Dec 2014 | British | 72 years |