| Alan Musgrave Olby | Director | 13 Jun 2011 | 17 Dec 2015 | British | 54 years |
| Alexander James Hanbury Duggan | Director | 1 Jun 2018 | 23 Apr 2025 | British | 55 years |
| Ann Hardy | Director | 27 Jul 2004 | 20 May 2011 | British | 67 years |
| Ann Hardy | Director | 13 Jun 2011 | 12 Feb 2013 | British | 67 years |
| Christine Susan Avis | Nominee Director | 22 Apr 1997 | 4 Nov 1997 | British | 61 years |
| Christophe Herve Frederic Foucher | Director | 20 May 2011 | 17 Dec 2015 | French | 59 years |
| Christopher Paul Spooner | Director | 20 May 2011 | 17 Dec 2015 | British | 57 years |
| David Paul Lumley Williams | Director | 16 Mar 1998 | 30 Nov 2004 | British | 81 years |
| David Paul Lumley Williams | Secretary | 16 Mar 1998 | 30 Nov 2004 | British | - |
| Frank Matthew Sunderland Hall | Director | 12 Jan 2009 | 10 Jun 2011 | Australian | 65 years |
| Frank Matthew Sunderland Hall | Secretary | 12 Jan 2009 | 20 May 2011 | Australian | - |
| Graham Stuart Smith | Director | 4 Nov 1997 | 4 Jun 1999 | British | 81 years |
| Jason Rodney Tate | Secretary | 21 Jan 2014 | 17 Dec 2015 | - | - |
| John Dawson | Director | 17 Dec 2015 | 30 Apr 2018 | British | 76 years |
| Marie Anne Cope | Director | 27 Sept 2005 | 24 May 2006 | British | 55 years |
| Marie Anne Cope | Secretary | 30 Nov 2004 | 24 May 2006 | British | - |
| Michael Geoffrey Avis | Nominee Secretary | 22 Apr 1997 | 4 Nov 1997 | British | - |
| Nigel John Goldsmith | Director | 12 Jun 2006 | 12 Jan 2009 | British | 63 years |
| Nigel John Goldsmith | Secretary | 12 Jun 2006 | 12 Jan 2009 | British | - |
| Nigel Terence Vane Quinn | Director | 16 Mar 1998 | 19 Feb 2001 | British | 70 years |
| Peter Jonathan Butterfield | Director | 17 Dec 2015 | 30 Jun 2024 | British | 50 years |
| Richard Drury | Director | 4 Nov 1997 | 8 May 2002 | British | 75 years |
| Richard Drury | Secretary | 4 Nov 1997 | 16 Mar 1998 | British | - |
| Robin Christian Bellhouse | Secretary | 31 Dec 2016 | 1 Sept 2017 | - | - |
| Sarah Nicole Robinson | Secretary | 17 Dec 2015 | 31 Dec 2016 | - | - |
| Stephen Charles Appelbee | Director | 4 Mar 2002 | 27 Sept 2005 | British | 69 years |
| Stephen Martin Kidner | Director | 1 Jun 2018 | 27 Sept 2022 | British | 57 years |
| Stephen Michael Redman | Director | 20 May 2011 | 21 Jan 2014 | British | 67 years |
| Stephen Michael Redman | Secretary | 20 May 2011 | 21 Jan 2014 | - | - |
| Timothy Wright | Director | 17 Oct 2005 | 20 May 2011 | British | 59 years |
| Timothy Wright | Secretary | 24 May 2006 | 12 Jun 2006 | British | - |