| Adrian Shooter | Director | 1 Apr 2003 | 19 Dec 2011 | British | 78 years |
| Aidan Edward Cambridge Nelson | Director | 1 Apr 2003 | 6 Apr 2007 | British | 76 years |
| Alan Charles Emery | Director | 1 Apr 2008 | 31 May 2017 | British | 85 years |
| Allen Walter Johnson | Director | 1 Apr 2003 | 25 Jun 2005 | American | 77 years |
| Andrew Edward Rose | Director | 1 Apr 2003 | 5 May 2005 | British | 75 years |
| Andrew James Course | Director | 1 Jan 2019 | 17 Sept 2019 | British | 60 years |
| Andrew Peter Litherland | Director | 4 Feb 2003 | 3 Mar 2003 | British | 72 years |
| Andrew Pollins | Director | 22 Dec 2023 | 7 Jun 2024 | British | 59 years |
| Anna Christina Ince | Director | 1 Nov 2019 | 31 Oct 2025 | British | 63 years |
| Anna Louise Bradley | Director | 8 Dec 2014 | 31 Dec 2018 | British | 69 years |
| Anson Charles Richard Jack | Director | 14 Jul 2004 | 31 May 2015 | British | 70 years |
| Anthony Edward Collins | Director | 8 Mar 2011 | 8 Oct 2013 | British | 69 years |
| Anthony Peter Hutchinson | Director | 21 Sept 2005 | 14 Jun 2007 | British | 78 years |
| Barbara Jane Moorhouse | Director | 1 Jan 2019 | 31 May 2022 | British | 68 years |
| Caroline Elizabeth Fawcett | Director | 1 Sept 2018 | 31 Aug 2021 | British | 67 years |
| Charles Stuart Horton | Director | 20 Dec 2011 | 11 Jan 2018 | British | 62 years |
| Christopher Rayner | Director | 1 Jan 2019 | 4 Mar 2021 | British | 68 years |
| Christopher Richard Leah | Director | 1 Apr 2003 | 30 Nov 2004 | British | 79 years |
| Christopher Victor Fenton | Director | 6 Jan 2014 | 20 May 2016 | British | 64 years |
| Claire Mann | Director | 30 Nov 2022 | 31 Mar 2024 | British | 53 years |
| David Gogo Waboso | Director | 1 Apr 2003 | 4 Apr 2005 | British | 70 years |
| David Hartmann Higgins | Director | 8 Mar 2011 | 28 Feb 2014 | British | 72 years |
| David Wilkinson Cawthra | Director | 3 Mar 2003 | 1 Apr 2003 | British | 83 years |
| Denis Tunnicliffe | Director | 1 Apr 2003 | 18 Apr 2008 | British | 83 years |
| Dolores Byrne | Director | 1 Apr 2015 | 31 Jul 2018 | British | 76 years |
| Eamon Roche | Secretary | 1 Jan 2018 | 21 Dec 2018 | - | - |
| Elizabeth Fleming | Secretary | 1 Jan 2010 | 11 Sept 2015 | - | - |
| Frank John Davies | Director | 1 Apr 2003 | 31 Mar 2008 | British | 95 years |
| Gareth Mark Llewellyn | Director | 20 Jul 2012 | 10 Mar 2015 | British | 62 years |
| Gary Richard Cooper | Director | 12 Jan 2018 | 31 Jan 2019 | British | 66 years |
| Geoffrey Michael Silson Spencer | Director | 14 Mar 2015 | 13 Mar 2024 | British | 60 years |
| George Richard Profit | Director | 1 Apr 2003 | 10 Dec 2010 | British | 86 years |
| Graham William Hopkins | Director | 1 Jun 2015 | 13 Aug 2018 | British | 68 years |
| Hans Nils Verner Ring | Director | 1 Apr 2003 | 31 Mar 2005 | Swedish | 72 years |
| Helen Joy Hasse | Secretary | 11 Sept 2015 | 31 Dec 2017 | - | - |
| Iain Michael Coucher | Director | 30 Nov 2004 | 11 Nov 2010 | British | 65 years |
| Jeremy Nicholas Candfield | Director | 1 Apr 2006 | 31 Mar 2016 | British | 73 years |
| John Anthony Self | Director | 14 Mar 2003 | 8 Apr 2003 | British | 78 years |
| John David Penney | Director | 1 Apr 2003 | 31 Mar 2006 | British | 83 years |
| John Simon Clarke | Director | 1 Jul 2017 | 18 Jun 2025 | British | 67 years |
| John Stirling Bradley | Secretary | 1 Apr 2003 | 31 Dec 2009 | British | - |
| Keith Louis Heller | Director | 26 Jul 2007 | 31 Jan 2010 | Canadian | 78 years |
| Lee Royston Jones | Director | 26 Jul 2016 | 1 Nov 2018 | British | 72 years |
| Leonard Keith Porter | Director | 8 Apr 2003 | 31 Mar 2014 | British | 74 years |
| Lindsay Crawford | Secretary | 4 Feb 2003 | 1 Apr 2003 | British | - |
| Malcolm Brown | Director | 1 Apr 2011 | 30 Jul 2018 | British | 59 years |
| Matias Hans Walter | Director | 1 Apr 2003 | 29 Jun 2004 | British | 77 years |
| Michael William Tuke Brown | Director | 23 Jun 2022 | 5 Jul 2025 | British | 62 years |
| Neil James Mcdonald | Director | 22 Feb 2010 | 13 Mar 2015 | British | 63 years |
| Paul Anthony Marchant | Director | 1 Nov 2018 | 30 Sept 2021 | British | 42 years |
| Paul Anthony Moseley Thomas | Director | 14 Oct 2005 | 31 Mar 2015 | British | 82 years |
| Paul Robert Kirk | Director | 27 Jul 2007 | 26 Jul 2016 | British | 74 years |
| Peter Henderson | Director | 11 Nov 2010 | 19 Jul 2012 | British | 72 years |
| Philip David Hoare | Director | 8 Apr 2016 | 13 Jun 2019 | British | 56 years |
| Robert Michael Andrews | Director | 4 Apr 2005 | 14 Jul 2005 | British | 70 years |
| Stephen Jeffrey Cocliff | Director | 1 Mar 2019 | 22 Feb 2025 | British | 68 years |
| Stephen John Murphy | Director | 11 Nov 2013 | 10 Nov 2022 | British | 57 years |
| Stuart Daniel Boner | Director | 21 Sept 2005 | 26 Jul 2007 | British | 70 years |
| Tanyaradzwa Tsitsi Wendy Mamie Chikanza | Director | 1 Oct 2021 | 22 Nov 2023 | British | 61 years |
| Thomas Rodford Cox | Director | 1 Apr 2003 | 30 Mar 2007 | British | 79 years |
| Tim Richard Dugher | Director | 1 Apr 2009 | 31 Mar 2011 | British | 67 years |
| Timothy Peter Gilbert | Director | 1 Apr 2003 | 31 Mar 2009 | British | 68 years |