| Andrew Richard Wood | Director | 1 Jun 1993 | 1 Jun 1995 | British | 75 years |
| Antoine Jean-baptiste Lagomarsino | Director | 1 Aug 2007 | 3 Jan 2012 | British | 76 years |
| Catriona Cairns | Director | 12 Nov 2002 | 31 Dec 2004 | British | 60 years |
| Christopher Howard James Castle | Director | 12 Nov 2002 | 18 Jul 2006 | British | 75 years |
| Christopher William Hindle | Director | 1 Aug 2023 | 14 Jul 2025 | British | 58 years |
| Colin Michael Chandler | Director | 31 Jan 2000 | 2 May 2002 | British | 87 years |
| David Robert Geoffrey Horne | Director | 1 Jan 2003 | 1 Aug 2007 | British | 72 years |
| David Whitehead | Director | 22 Aug 1992 | 31 Mar 1999 | British | 92 years |
| David Whittaker | Director | 22 Aug 1992 | 16 Jun 2000 | British | 82 years |
| David Whittaker | Secretary | 22 Aug 1992 | 16 Jun 2000 | British | - |
| Dean Richard Mason | Director | 23 Aug 2010 | 6 Mar 2015 | British | 67 years |
| Denis Vincent Bernard Marie Plantier | Director | 1 Jan 2016 | 21 Apr 2017 | French | 64 years |
| Dennis Patrick Murray | Director | 22 Aug 1992 | 31 Dec 2002 | British | 76 years |
| Derrick Timothy Porter Orr | Director | 3 Sept 2003 | 1 Jul 2013 | British | 64 years |
| Edward Anthony Noel Lowe | Director | 1 Apr 2010 | 1 Jul 2013 | British | 72 years |
| Ernest Thomas Harrison | Director | 22 Aug 1992 | 31 Jan 2000 | British | 100 years |
| Ewen Angus Mccrorie | Director | 1 Apr 2013 | 1 Aug 2023 | British | 68 years |
| Fiona Anne Richards | Director | 1 Sept 1998 | 6 Sept 2002 | British | 64 years |
| Guy Elie Baruchel | Director | 1 Jul 2013 | 29 Jan 2016 | French | 76 years |
| Jean Yves Bernard Francois Haagen | Director | 3 Sept 2003 | 1 Sept 2004 | French | 62 years |
| Kathryn Helen Jenkins | Director | 3 Sept 2003 | 21 Apr 2017 | British | 60 years |
| Lawrence Hammond | Director | 31 Dec 2007 | 31 Dec 2013 | British | 63 years |
| Mark Alfred Roberts | Director | 20 Aug 2002 | 28 Feb 2003 | British | 66 years |
| Markus Denis Leutert | Director | 1 Jul 2013 | 25 Jul 2014 | Swiss | 52 years |
| Michael James Speed | Director | 22 Aug 1992 | 31 Dec 2000 | British | 84 years |
| Michael William Peter Seabrook | Secretary | 16 Jun 2000 | 3 Feb 2025 | British | - |
| Nicholas Topazio | Director | 1 Jun 1995 | 31 Oct 2002 | British | 66 years |
| Paul Alexander Goodge | Director | 1 Apr 2010 | 3 Sept 2012 | British | 62 years |
| Paul Watson | Director | 1 Apr 2013 | 5 Jan 2015 | British | 62 years |
| Peter John Rowley | Director | 1 Jan 2014 | 31 Aug 2015 | British | 72 years |
| Philippe Chamoret | Director | 1 Oct 2010 | 1 Apr 2013 | French | 65 years |
| Richard Charles Poston | Director | 22 Aug 1992 | 31 Oct 1999 | British | 67 years |
| Richard William Vincent | Director | 31 Oct 1999 | 28 Feb 2001 | British | 82 years |
| Robert Ian Melrose | Director | 22 Aug 1992 | 28 Feb 1999 | British | 77 years |
| Samuel George Keayes | Director | 1 Apr 2010 | 25 Oct 2010 | British | 52 years |
| Shaun Kevin Jones | Director | 1 Sept 2008 | 1 Oct 2010 | British | 60 years |
| Stephane Henri Pierre Ramon | Director | 3 Jan 2012 | 1 Apr 2013 | French | 60 years |
| Suzanne Jayne Stratton | Director | 1 Sept 2015 | 21 Apr 2017 | British | 54 years |
| Thomas O'neill | Director | 3 Sept 2003 | 31 Dec 2003 | British | 83 years |
| Victor Manuel Chavez | Director | 1 Apr 2010 | 21 Apr 2017 | British | 63 years |
| William Alvin Wilby | Director | 25 Oct 2010 | 21 Apr 2017 | British | 68 years |
| William Kenneth Graham Ward | Director | 22 Aug 1992 | 7 Oct 1994 | British | 97 years |
| William Paul Moffatt | Director | 1 Sept 1998 | 6 Sept 2002 | British | 70 years |
| William Paul Moffatt | Director | 1 Sept 2004 | 31 Dec 2007 | British | 70 years |