| Adele Ann Abigail | Director | 7 Aug 2008 | 1 Oct 2009 | Irish | 53 years |
| Alistair Charles Walter Williams | Director | 1 May 2002 | 18 Apr 2003 | British | 63 years |
| Andrew Lawrence Griffiths | Director | 10 Sept 1993 | 28 Oct 1994 | British | 72 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 2 Feb 2012 | British | 62 years |
| Aniko Mahler | Director | 5 Nov 2015 | 1 Aug 2018 | Hungarian | 50 years |
| Aniko Mahler | Director | 8 Nov 2021 | 12 Dec 2024 | Hungarian | 50 years |
| Barry Edward Wickham | Director | 2 Mar 1993 | 25 Aug 1993 | British | 85 years |
| Barry Edward Wickham | Director | 27 Jan 1995 | 27 Mar 1998 | British | 85 years |
| Barry Ronald Cumberland | Director | 10 Sept 1993 | 27 Jan 1995 | British | 77 years |
| Catherine Beris James | Director | 18 Aug 1993 | 21 Dec 1993 | British | 72 years |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Christopher Jon Taylor | Secretary | 1 Jun 1998 | 1 Jul 1999 | British | - |
| Christopher Joseph Parratt | Director | 1 Dec 1993 | 21 Dec 1993 | British | 64 years |
| Christopher Richard Roff Marsh | Director | 17 Feb 2006 | 30 Sept 2007 | British | 58 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| David Charles Carter | Director | 30 Nov 1994 | 30 Sept 2011 | British | 78 years |
| David Edward Tagg | Director | 2 Mar 1993 | 31 Jul 1998 | British | 86 years |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 24 Mar 2011 | 2 Feb 2012 | British | 56 years |
| David John Fitzjohn | Director | 10 Sept 1993 | 17 Mar 1995 | British | 70 years |
| Debra Jennings | Director | 27 Jan 1995 | 31 Jan 1996 | American | 67 years |
| Dora Keresztesi | Director | 11 Sept 2020 | 8 Nov 2021 | Hungarian | 40 years |
| Gabor Kovacs | Director | 1 Aug 2018 | 1 Sept 2020 | Hungarian | 46 years |
| Gavin Paul Crickmore | Director | 28 Jun 2007 | 2 Feb 2012 | British | 68 years |
| Jill Kyne | Director | 28 Jun 2007 | 29 Jun 2009 | British | 62 years |
| John James Corbett | Director | 8 Nov 1996 | 10 Nov 2000 | British | 80 years |
| John James Nicholls | Director | 24 Mar 2011 | 9 Mar 2018 | British | 64 years |
| John James Nicholls | Secretary | 15 Mar 2002 | 2 Feb 2012 | British | - |
| John William Pursell | Director | 16 Dec 2011 | 5 Nov 2015 | American | 65 years |
| Jonathan Michael Guttridge | Secretary | 5 Jan 2018 | 20 Apr 2018 | - | - |
| Jose Alberto Ibeas Franco | Director | 16 Dec 2011 | 2 Feb 2012 | Spanish | 54 years |
| Mark David Peters | Director | 27 Mar 1998 | 10 Nov 2000 | British | 67 years |
| Mark David Peters | Secretary | 1 Jul 1999 | 10 Nov 2000 | British | - |
| Matthew John Lester | Director | 7 Apr 2005 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 31 Jan 1996 | 8 Nov 1996 | British | 69 years |
| Michael Christopher Flynn | Director | 22 Apr 2003 | 15 Jun 2008 | British | 69 years |
| Michael John Dunthorne | Director | 25 Jan 1995 | 31 Jul 1995 | British | 81 years |
| Nandor Makos | Director | 27 Jul 2006 | 1 Aug 2014 | Hungarian | 62 years |
| Paul Derek Tunnacliffe | Director | 7 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paviter Singh Binning | Director | 12 May 1999 | 3 Oct 2003 | British | 66 years |
| Peter Henry Coleman | Secretary | 25 Aug 1993 | 27 Jan 1995 | British | - |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Raymond Gerald Hawkins | Director | 18 Aug 1993 | 27 Jan 1995 | British | 83 years |
| Raymond James Joy | Director | 20 Apr 2004 | 22 Jun 2007 | British | 72 years |
| Richelle Therese Twomey | Director | 5 Nov 2015 | 30 Jul 2021 | Irish | 51 years |
| Robert Geoffrey Williams | Director | 18 Aug 1993 | 27 Jan 1995 | British | 77 years |
| Roger Hugh Myddelton | Director | 2 Mar 1993 | 25 Aug 1993 | British | 84 years |
| Roger Hugh Myddelton | Director | 27 Jan 1995 | 31 Mar 2003 | British | 84 years |
| Sally Catherine Moore | Director | 28 Jun 2007 | 24 Mar 2011 | British | 61 years |
| Stephen John Bolton | Director | 1 Apr 2011 | 2 Feb 2012 | British | 64 years |
| Stewart Michael Segal | Director | 10 Sept 1993 | 11 Nov 1994 | British | 69 years |
| Susanne Margaret Adams | Secretary | 2 Mar 1993 | 25 Aug 1993 | British | - |
| Susanne Margaret Adams | Secretary | 10 Nov 2000 | 15 Mar 2002 | British | - |
| Susanne Margaret Bunn | Director | 27 Mar 1998 | 4 Jan 2008 | British | 67 years |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |
| William David Brant | Director | 10 Sept 1993 | 22 Nov 1996 | British | 79 years |