| Alex Paul Carter | Director | 1 Sept 2003 | 30 Nov 2011 | British | 67 years |
| Andrew Richard Bryce | Director | 10 Jan 1992 | 11 Aug 2003 | United Kingdom | 79 years |
| Andrew Rodney Wickham | Director | 1 Sept 2003 | 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 | 11 Aug 2003 | 8 Jul 2006 | British | 77 years |
| David Allen Brown | Director | 1 Apr 2011 | 5 Nov 2021 | British | 66 years |
| Douglas Allenby Smith | Director | 10 Jan 1992 | 6 Dec 2001 | British | 109 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 |
| Geoffrey Michael Parsons | Director | 1 Aug 2001 | 9 Jul 2007 | British | 63 years |
| Gordon Alexander Boyd | Director | 28 Sept 2021 | 28 Mar 2022 | British | 66 years |
| Hugh Malone | Director | 10 Jan 1992 | 11 Aug 2003 | United Kingdom | 78 years |
| Hugh Malone | Secretary | 10 Jan 1992 | 11 Aug 2003 | United Kingdom | - |
| Ian Philip Butcher | Director | 11 Aug 2003 | 1 Jul 2007 | British | 75 years |
| Ian Philip Butcher | Secretary | 11 Aug 2003 | 30 Jun 2006 | 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 |
| Martin Stanley Andrew Ballinger | Director | 11 Aug 2003 | 31 Dec 2004 | British | 83 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 |
| Rodney Alexander Luxton | Director | 10 Jan 1992 | 31 Jul 2001 | United Kingdom | 87 years |
| Simon Patrick Butcher | Director | 14 Mar 2016 | 30 Nov 2018 | British | 59 years |