| Anthony Douglas Roche | Director | 29 May 1996 | 2 Mar 1997 | British | 83 years |
| Bernard Denis Maurice Tabary | Director | 1 Feb 2011 | 10 Dec 2017 | French | 66 years |
| Carolyn Ferguson | Secretary | 1 Jul 2006 | 12 Aug 2024 | British | - |
| Charles Anthony Hodgson | Director | 6 Dec 2015 | 10 Dec 2017 | British | 47 years |
| Christian Schreyer | Director | 5 Nov 2021 | 31 Oct 2023 | German | 58 years |
| Christopher Moyes | Director | 28 Feb 1997 | 8 Jul 2006 | British | 77 years |
| Clifford Edward Perry | Director | 11 Oct 1995 | 12 Apr 1997 | British | 81 years |
| David Allen Brown | Director | 1 Apr 2011 | 5 Nov 2021 | British | 66 years |
| David Burton | Director | 13 Feb 1995 | 11 Apr 1996 | British | 79 years |
| David Garth Griffin-smith | Director | 14 Jan 1995 | 31 Jan 1995 | British | 81 years |
| David William Sawyer | Director | 18 May 2001 | 31 Mar 2006 | British | 77 years |
| Elodie Marie Francoise Brian | Director | 5 Jun 2019 | 27 Sept 2021 | French | 47 years |
| Euan Alexander Robert Cameron | Director | 9 Nov 1995 | 11 Nov 1995 | British | 73 years |
| Euan Alexander Robert Cameron | Director | 2 Feb 1996 | 30 Apr 1999 | British | 73 years |
| Gordon Alexander Boyd | Director | 28 Sept 2021 | 28 Mar 2022 | British | 66 years |
| Heather Jane Bonney | Secretary | 14 Jan 1995 | 31 Jan 1995 | British | - |
| Ian George Powney | Director | 28 Mar 1995 | 10 Apr 1996 | British | 76 years |
| Ian Philip Butcher | Director | 28 Feb 1997 | 1 Jul 2007 | British | 75 years |
| Ian Philip Butcher | Secretary | 28 Feb 1997 | 30 Jun 2006 | British | - |
| James Henry Collins | Director | 31 Jan 1995 | 25 Sept 1995 | British | 74 years |
| Jean-pierre Deghaye | Director | 13 Nov 2000 | 5 Oct 2007 | French | 78 years |
| John Graeme Nelson | Director | 31 Jan 1995 | 2 Mar 1997 | British | 79 years |
| Keith Down | Director | 7 Mar 2011 | 6 Dec 2015 | British | 61 years |
| Keith Lawrence Ludeman | Director | 1 Apr 1999 | 2 Jul 2011 | British | 76 years |
| Kenneth John Watson | Director | 22 Apr 1996 | 8 Apr 2004 | British | 78 years |
| Malcolm Robert Rimmer | Director | 20 Jul 2010 | 11 Jun 2015 | British | 67 years |
| Mark Jeremy Causebrook | Director | 12 Apr 1999 | 31 Mar 2006 | British | 74 years |
| Martin Stanley Andrew Ballinger | Director | 28 Feb 1997 | 31 Dec 2004 | British | 83 years |
| Michel Cornil | Director | 26 Feb 1997 | 23 Oct 2000 | French | 82 years |
| Michel Laurent Masson | Director | 6 Oct 2006 | 11 Sept 2009 | French | 58 years |
| Nicholas Swift | Director | 17 Jul 2007 | 7 Mar 2011 | British | 62 years |
| Nicolas Luc Daniel Vandevyver | Director | 4 Dec 2009 | 11 Jun 2015 | French | 62 years |
| Patrick Raymond Jeantet | Director | 26 Oct 2005 | 1 Feb 2011 | French | 66 years |
| Peter Graham Hewett | Secretary | 31 Jan 1995 | 2 Mar 1997 | British | - |
| Pierre Andre Massard | Director | 26 Feb 1997 | 23 Oct 2000 | French | 77 years |
| Ralph Anthony Porter | Director | 14 Jan 1995 | 31 Jan 1995 | British | 95 years |
| Roger Mcdonald | Director | 28 Feb 1997 | 31 Jan 1999 | British | 73 years |
| Simon Patrick Butcher | Director | 14 Mar 2016 | 30 Nov 2018 | British | 59 years |
| Stephane Andre Richon | Director | 5 Oct 2007 | 6 May 2010 | French | 74 years |
| Wilma Mary Allan | Director | 9 Apr 2004 | 8 Dec 2017 | British | 64 years |
| Yves Magnan | Director | 13 Nov 2000 | 26 Oct 2005 | French | 78 years |