| Andrew John Stanley Field | Director | 23 Jan 1998 | 19 Oct 1998 | British | 64 years |
| Arthur Dodgson | Director | 14 Feb 2003 | 21 Oct 2008 | British | 73 years |
| Charles Robertson Whyte | Director | 5 May 1992 | 23 Jan 1998 | British | 91 years |
| Christian Schreyer | Director | 5 Nov 2021 | 20 Sept 2022 | German | 58 years |
| Christopher Chaput | Director | 24 May 1995 | 14 Sept 1998 | Usa | 66 years |
| Christopher Moyes | Director | 19 Oct 1998 | 8 Jul 2006 | British | 77 years |
| Daniel Robert Brewin | Director | 8 Nov 1992 | 19 Feb 1993 | British | 80 years |
| David Allen Brown | Director | 1 Apr 2011 | 5 Nov 2021 | British | 66 years |
| David Christopher Wookey | Director | 8 Dec 1994 | 19 Oct 1998 | British | 86 years |
| David John Quinn | Secretary | 5 May 1992 | 31 Dec 1998 | British | - |
| Elodie Marie Francoise Brian | Director | 5 Jun 2019 | 27 Sept 2021 | French | 47 years |
| Gordon Alexander Boyd | Director | 28 Sept 2021 | 28 Mar 2022 | British | 66 years |
| Harold Whincup | Director | 5 May 1992 | 31 Dec 1994 | British | 104 years |
| Harris Parks Morris | Director | 6 Dec 1993 | 30 Jun 1994 | Usa | 86 years |
| Hendrikus Verwer | Director | 1 Nov 2008 | 10 Dec 2017 | Dutch | 66 years |
| Ian Philip Butcher | Director | 19 Oct 1998 | 1 Jul 2007 | British | 75 years |
| Ian Philip Butcher | Secretary | 31 Dec 1998 | 30 Jun 2006 | British | - |
| Ian Thornley | Director | 10 Apr 1995 | 22 Dec 1997 | British | 68 years |
| Ivor Broom | Director | 5 May 1992 | 16 Apr 1993 | British | 106 years |
| Jennifer Stevenson Young | Director | 10 Apr 1995 | 19 Oct 1998 | Usa | 73 years |
| John Boatright | Director | 31 Dec 1996 | 19 Oct 1998 | Usa | 76 years |
| John Derek Fenwick Owen | Director | 1 Jan 1995 | 11 Oct 2002 | British | 76 years |
| John Philip Harvey | Director | 5 May 1992 | 19 Oct 1998 | British | 76 years |
| Keith Down | Director | 7 Mar 2011 | 6 Dec 2015 | British | 61 years |
| Keith Ian Nicholls | Director | 18 Mar 2005 | 12 Feb 2010 | British | 69 years |
| Keith Lawrence Ludeman | Director | 10 Jul 2006 | 2 Jul 2011 | British | 76 years |
| Malcolm John Bromham | Director | 5 May 1992 | 8 Dec 1994 | British | 76 years |
| Mark Daniel Powers | Director | 14 Sept 1998 | 19 Oct 1998 | American | 73 years |
| Mark Robert Ferriday | Director | 20 Sept 2022 | 30 Apr 2023 | British | 51 years |
| Martin Stanley Andrew Ballinger | Director | 19 Oct 1998 | 31 Dec 2004 | British | 83 years |
| Michael Anthony Street | Director | 8 Nov 1992 | 19 Feb 1993 | British | 79 years |
| Michael Edward Wright | Director | 30 Jun 1994 | 10 Apr 1995 | Usa | 91 years |
| Michael Geoffrey Medlicott | Director | 10 Apr 1995 | 31 Dec 1996 | British | 83 years |
| Michael Joseph Macnulty | Director | 23 May 1996 | 19 Oct 1998 | Irish | 91 years |
| Nicholas Swift | Director | 17 Jul 2007 | 7 Mar 2011 | British | 62 years |
| Peter Henry Ryan | Director | 5 May 1992 | 8 Nov 1992 | British | 96 years |
| Peter Henry Ryan | Director | 1 Apr 1993 | 11 Jan 1996 | British | 96 years |
| Peter James O'boyle | Director | 5 May 1992 | 16 Jan 2003 | British | 77 years |
| Philip Pacey | Director | 1 Nov 2008 | 31 Dec 2010 | British | 68 years |
| Richard John Hunt | Director | 14 Feb 2003 | 8 Feb 2006 | British | 75 years |
| Sam Sawers | Director | 1 May 2023 | 19 Sept 2024 | New Zealander | 38 years |
| Simon Patrick Butcher | Director | 14 Mar 2016 | 30 Nov 2018 | British | 59 years |
| Steven Radusin | Director | 12 Apr 1999 | 30 Jun 2001 | British | 65 years |
| Thomas Steven Jr Schreier | Director | 6 Dec 1993 | 24 May 1995 | British | 64 years |