| Alan Ernest Thomas | Director | 25 Jul 1991 | 28 Feb 2007 | British | 79 years |
| Alexandra Maria Johanna Berger | Director | 22 Oct 2020 | 20 Jan 2023 | Dutch | 51 years |
| Bryan James Ian Lawrie | Director | 1 Jul 2011 | 17 Jun 2022 | British | 53 years |
| Charles Eugene Shackleton Strickland | Secretary | 23 Sept 2015 | 30 Jun 2020 | - | - |
| Christopher Francis Girling | Director | 22 Nov 2007 | 30 Nov 2014 | British | 72 years |
| David Evison | Director | 10 Feb 2014 | 30 Nov 2022 | British | 62 years |
| George Watson | Secretary | 25 Jul 1991 | 31 May 2005 | British | - |
| Helen Jane Wright | Director | 2 Jan 2019 | 18 Apr 2023 | British | 50 years |
| Jenny Nancy Loncaster | Secretary | 1 Jun 2005 | 8 Nov 2013 | British | - |
| Jenny Nancy Loncaster | Director | 8 Apr 2008 | 10 Dec 2013 | British | 58 years |
| Joan Barbara Irving | Director | 8 May 2007 | 31 Dec 2013 | British | 64 years |
| Joanna Carolyn Richardson | Director | 1 Mar 2001 | 27 Feb 2008 | British | 57 years |
| Joanna Daubney Lloyd | Director | 5 Mar 2012 | 30 Dec 2015 | British | 54 years |
| John Andrew Theakston | Director | 28 Jun 2005 | 31 Mar 2017 | British | 74 years |
| John Francis Clarke | Director | 1 Jul 1995 | 30 Sept 2001 | British | 82 years |
| John Sloan Martin | Director | 25 Jul 1991 | 31 Jan 2008 | British | 83 years |
| Jonathan Paul Barrett | Secretary | 8 Nov 2013 | 23 Sept 2015 | - | - |
| Kevin Appleton | Director | 23 Mar 2016 | 22 Mar 2025 | British | 66 years |
| Michael Goodare | Director | 18 May 2002 | 31 Oct 2011 | British | 63 years |
| Michael Stanley Cooke | Director | 25 Jul 1991 | 29 Feb 1996 | British | 92 years |
| Neil Joseph Dodds | Secretary | 30 Jun 2020 | 31 Aug 2024 | - | - |
| Neil Jowsey | Director | 8 May 2007 | 9 Apr 2018 | British | 62 years |
| Nicholas Alexander Cyril Hildyard | Director | 5 Aug 2002 | 31 Dec 2021 | British | 72 years |
| Peter James Sleigh | Director | 1 Mar 1993 | 1 Jul 2008 | British | 76 years |
| Rodney Leslie Harris | Director | 25 Jul 1991 | 2 Feb 2004 | British | 82 years |
| Ronald Wallace Paterson Dow | Director | 1 Jul 1995 | 31 Mar 2002 | British | 77 years |
| Sandra Bateson | Director | 2 Feb 2004 | 1 Jul 2011 | British | 75 years |
| Simon Paul Harrison | Director | 31 Jan 2015 | 31 Dec 2020 | British | 59 years |
| Stephen Martin | Director | 25 Jul 1991 | 27 Sept 2023 | British | 87 years |
| Susan Jones | Director | 10 Apr 2017 | 15 Feb 2019 | British | 66 years |
| Suzanne Walton | Director | 5 Mar 2012 | 1 Jul 2014 | British | 60 years |
| Tom Martin | Director | 25 Jul 1991 | 27 Sept 2023 | British | 90 years |
| Vincent Gibbons | Director | 25 Jul 1991 | 31 Mar 1996 | British | 90 years |
| William John Bramley | Director | 1 Mar 1993 | 2 Jul 2007 | British | 74 years |