| Alexander Brian Cooper Short | Director | 1 Sept 2014 | 4 Jul 2016 | British | 59 years |
| Alice Mary Cleoniki Avis | Director | 1 Aug 2015 | 2 Sept 2024 | British | 64 years |
| Andrew Gillespie | Director | 12 Jul 1989 | 31 Dec 1998 | British | 88 years |
| Barrie Mason Jackson | Director | 1 Jan 1994 | 31 May 2005 | British | 71 years |
| Crawford Scott Gillies | Director | 1 Feb 2017 | 1 Apr 2025 | British | 70 years |
| David Hedley Richardson | Director | 1 Jul 2013 | 15 Sept 2020 | British | 75 years |
| Graham Robert Hutcheon | Director | 27 Oct 2003 | 31 Mar 2021 | British | 63 years |
| Ian Barrett Curle | Director | 1 Jul 1997 | 29 Mar 2019 | British | 65 years |
| John Alexander Rose Macphail | Director | 12 Jul 1989 | 31 Dec 1993 | British | 103 years |
| John Andrew Spence | Director | 1 Apr 2001 | 31 May 2007 | British | 75 years |
| John James Griffen Good | Director | 12 Jul 1989 | 31 Jul 2013 | British | 83 years |
| Kenneth Callum Orr Barton | Director | 6 Apr 2007 | 31 Jul 2018 | British | 77 years |
| Kenneth David Mackay Cameron | Director | 12 Jul 1989 | 20 Jul 1995 | British | 101 years |
| Kenneth David Mackay Cameron | Secretary | 12 Jul 1989 | 31 Dec 1994 | British | - |
| Kim Winser | Director | 1 Apr 2002 | 31 Mar 2006 | British | 67 years |
| Martin Alexander Cooke | Secretary | 1 Jul 1997 | 31 Aug 2020 | British | - |
| Norman Loch Murray | Director | 1 Apr 2012 | 26 Jul 2017 | British | 78 years |
| Richard Jackson Arrol Hunter | Director | 1 Jan 1994 | 1 Jul 2014 | British | 71 years |
| Richard Jackson Arrol Hunter | Secretary | 1 Jan 1995 | 1 Jul 1997 | British | - |
| Richard William Farrar | Director | 27 Oct 2003 | 5 Jun 2017 | British | 68 years |
| Ronald James Scott Bell | Director | 1 Oct 2005 | 31 Jul 2015 | British | 76 years |
| Shinichiro Hizuka | Director | 12 Mar 2020 | 30 Mar 2023 | Japanese | 71 years |
| Thomas Macpherson Lawrie | Director | 4 Apr 1996 | 31 Mar 2001 | British | 92 years |
| Trina Catherine Glen | Director | 1 May 2008 | 5 Nov 2009 | British | 57 years |