| Alastair James Mitchell | Director | 14 Dec 1992 | 4 Jun 1997 | British | 94 years |
| Ann Scane | Secretary | 24 Feb 1995 | 14 Feb 2000 | British | - |
| Brian Charles Arthur Asbee | Director | 4 Sept 1995 | 19 Apr 1996 | British | 90 years |
| Christopher Tawney | Director | 19 Apr 1996 | 30 Sept 1999 | British | 69 years |
| Christopher William Humphris | Director | 14 Dec 1992 | 25 Feb 1994 | British | 74 years |
| David Blakemore | Director | 13 Jul 1991 | 1 Oct 1992 | British | 85 years |
| David Ian Roberts | Director | 31 Jul 2009 | 1 Nov 2010 | British | 50 years |
| David Robert Geoffrey Horne | Director | 14 Jul 2005 | 31 Jan 2007 | British | 72 years |
| Gerald Robert Warren Bradley | Director | 14 Feb 2000 | 30 Jun 2008 | British | 69 years |
| Herve Louis Girault | Director | 13 Jul 1991 | 23 Apr 1992 | French | 84 years |
| Isabelle Suzanne Marie Therese Elie | Director | 30 Sept 1997 | 15 Feb 1999 | French | 62 years |
| James Edward Handley | Director | 11 Jun 1999 | 3 Dec 2001 | British | 75 years |
| Jean Daniel Chabas | Director | 23 Apr 1992 | 20 Dec 1996 | French | 87 years |
| Jean Yves Bernard Francois Haagen | Secretary | 7 Dec 2000 | 1 Sept 2004 | French | - |
| Joelle Rose-marie Dumetz | Director | 9 Jun 1995 | 10 Apr 2017 | British | 75 years |
| John Charles Brown | Director | 2 Aug 1994 | 24 Feb 1995 | British | 73 years |
| John Charles Brown | Director | 2 Aug 1994 | 20 Nov 1996 | British | 73 years |
| John Charles Brown | Secretary | 13 Jul 1991 | 24 Feb 1995 | British | - |
| John Howard Davies | Director | 25 Feb 1997 | 30 Jun 2008 | British | 82 years |
| Kathryn Helen Jenkins | Director | 2 Dec 2003 | 14 Jul 2005 | British | 60 years |
| Leslie Thomas James | Director | 25 Feb 1997 | 10 Apr 2017 | British | 87 years |
| Mark Alfred Roberts | Director | 4 Dec 2001 | 4 Feb 2003 | British | 66 years |
| Martin David Parmenter | Director | 25 Feb 1997 | 6 Dec 2000 | British | 68 years |
| Martin David Parmenter | Secretary | 14 Feb 2000 | 6 Dec 2000 | British | - |
| Michael Dalton Murray | Director | 1 Nov 2010 | 10 Apr 2017 | Irish | 67 years |
| Nicholas Topazio | Director | 7 Dec 2000 | 31 Oct 2002 | British | 66 years |
| Richard James Broadbridge | Director | 6 Apr 1994 | 4 Jun 1997 | British | 84 years |
| Roland Michiel Dierick | Director | 2 Aug 1994 | 19 Jan 1995 | Dutch | 66 years |
| Simon Roberts | Director | 31 Jan 2007 | 31 Jul 2009 | British | 69 years |
| Sylvie Brossard | Director | 4 Sept 1995 | 10 Jan 1997 | French | 65 years |
| Thomas O'neill | Director | 4 Feb 2003 | 31 Dec 2003 | British | 83 years |
| Veronique Odile Francoise Rostas | Director | 25 Feb 1997 | 30 Sept 1997 | French | 69 years |
| William John Mark Twigg | Director | 6 Apr 2007 | 6 Apr 2007 | British | 68 years |
| William Paul Moffatt | Secretary | 1 Sept 2004 | 31 Dec 2007 | British | - |
| William Rees Davies | Director | 13 Jul 1991 | 20 Jan 1993 | British | 82 years |