| Alex Paul Carter | Director | 19 Jan 2006 | 30 Nov 2011 | British | 67 years |
| Andrew Rodney Wickham | Director | 19 Jan 2006 | 17 Dec 2009 | British | 60 years |
| Andrew Rodney Wickham | Director | 14 Dec 2011 | 25 May 2025 | British | 60 years |
| Christian Schreyer | Director | 5 Nov 2021 | 13 Oct 2022 | German | 58 years |
| Christopher Moyes | Director | 29 Jul 2005 | 8 Jul 2006 | British | 77 years |
| David Allen Brown | Director | 1 Apr 2011 | 5 Nov 2021 | British | 66 years |
| Edward John Andrew Wills | Director | 21 Jun 2010 | 17 Feb 2018 | British | 46 years |
| Elodie Marie Francoise Brian | Director | 5 Jun 2019 | 27 Sept 2021 | French | 47 years |
| Gary Vernon Reginald Batchelor | Director | 15 Sept 1992 | 22 Nov 1993 | British | 91 years |
| Geoffrey Michael Parsons | Director | 19 Jan 2006 | 9 Jul 2007 | British | 63 years |
| George Colin Mcpherson | Director | 16 Sept 2005 | 15 Jun 2006 | British | 67 years |
| Gordon Alexander Boyd | Director | 28 Sept 2021 | 28 Mar 2022 | British | 66 years |
| Ian Philip Butcher | Director | 29 Jul 2005 | 1 Jul 2007 | British | 75 years |
| Ian Philip Butcher | Secretary | 29 Jul 2005 | 30 Jun 2006 | British | - |
| Ian William Palmer | Director | 15 Sept 1992 | 31 Jul 2005 | British | 72 years |
| Kathryn Boyes | Secretary | 10 Sept 2001 | 31 Jul 2005 | British | - |
| Keith Down | Director | 7 Mar 2011 | 6 Dec 2015 | British | 61 years |
| Keith Lawrence Ludeman | Director | 10 Jul 2006 | 2 Jul 2011 | British | 76 years |
| Kenneth Raymond Pond | Director | 15 Sept 1992 | 10 Sept 2001 | British | 87 years |
| Kenneth Raymond Pond | Secretary | 15 Sept 1992 | 10 Sept 2001 | British | - |
| Malcolm Kenneth Venn | Director | 10 Sept 2001 | 29 Feb 2004 | British | 69 years |
| Marc Owain Morgan Huws | Director | 13 Oct 2003 | 30 Jul 2004 | British | 58 years |
| Matthew Stjohn Dolphin | Director | 1 Apr 2006 | 31 Dec 2011 | British | 58 years |
| Nicholas John Dillon Woods | Director | 11 Jul 2012 | 12 Feb 2016 | British | 57 years |
| Nicholas Swift | Director | 17 Jul 2007 | 7 Mar 2011 | British | 62 years |
| Peter Joseph John Shelley | Director | 15 Sept 1992 | 30 Jul 2004 | British | 70 years |
| Philip John Stockley | Director | 5 Apr 2004 | 19 Jan 2006 | British | 53 years |
| Robert Stanley Dorr | Director | 1 Nov 2004 | 1 Dec 2005 | British | 72 years |
| Simon Patrick Butcher | Director | 14 Mar 2016 | 30 Nov 2018 | British | 59 years |
| Stuart Geoffrey Linn | Director | 15 Sept 1992 | 31 Jul 2005 | British | 74 years |