| Adele Ann Abigail | Director | 7 Aug 2008 | 1 Oct 2009 | Irish | 53 years |
| Allen John George Sheppard | Director | 16 Mar 1992 | 2 Oct 1992 | British | 94 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 29 Jun 2009 | British | 62 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 |
| Barry Edward Wickham | Director | 18 Sept 1996 | 27 Mar 1998 | British | 85 years |
| Barry Edward Wickham | Secretary | 16 Mar 1992 | 21 Mar 1996 | British | - |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Christopher Mark Lewin | Director | 1 Aug 2020 | 30 Sept 2021 | 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 Edward Tagg | Director | 18 Sept 1996 | 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 Percy Nash | Director | 16 Mar 1992 | 17 Oct 1995 | British | 86 years |
| Dorotea Keresztesi | Director | 11 Sept 2020 | 14 Jun 2024 | Hungarian | 40 years |
| Elizabeth Anna Brown | Director | 30 May 2018 | 28 Sept 2018 | British | 46 years |
| Gabor Kovacs | Director | 1 Aug 2018 | 1 Sept 2020 | Hungarian | 46 years |
| Gabor Kovacs | Director | 1 Oct 2018 | 1 Oct 2018 | Hungarian | 46 years |
| Gavin Paul Crickmore | Director | 28 Jun 2007 | 2 Feb 2012 | British | 68 years |
| Gerald Michael Nolan Corbett | Director | 2 Sept 1994 | 8 Jul 1997 | British | 75 years |
| Ian Anthony Hockney | Director | 1 Oct 2014 | 5 Nov 2015 | British | 51 years |
| Ian Stewart Cray | Director | 30 Jun 2000 | 12 Jan 2001 | British | 69 years |
| James Matthew Crayden Edmunds | Director | 8 Mar 2018 | 30 May 2018 | British | 52 years |
| Jill Kyne | Director | 28 Jun 2007 | 29 Jun 2009 | British | 62 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 | - |
| Jonathan Michael Guttridge | Secretary | 5 Jan 2018 | 20 Apr 2018 | - | - |
| Jose Alberto Ibeas Franco | Director | 16 Dec 2011 | 2 Feb 2012 | Spanish | 54 years |
| Kara Elizabeth Major | Director | 1 Aug 2018 | 1 Aug 2018 | American | 49 years |
| Mark David Peters | Director | 27 Mar 1998 | 10 Nov 2000 | British | 67 years |
| Matthew John Lester | Director | 31 Jan 2003 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 7 Apr 2005 | 15 Jun 2008 | British | 69 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 | 31 Jan 2003 | 3 Oct 2003 | British | 66 years |
| Phillip Keague Bentley | Director | 24 Sept 1996 | 30 Jun 2000 | British | 67 years |
| Prabhaharan Viswanathan | Director | 4 Dec 2019 | 1 Aug 2020 | Australian | 54 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Robert Joseph Moore | Director | 15 Jan 2001 | 31 Jan 2003 | American | 65 years |
| Roger Hugh Myddelton | Director | 16 Mar 1992 | 31 Mar 2003 | British | 84 years |
| Rosemary Prudence Thorne | Director | 16 Mar 1992 | 2 Mar 1994 | British | 74 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 |
| Susanne Margaret Bunn | Director | 10 Nov 2000 | 4 Jan 2008 | British | 67 years |
| Susanne Margaret Bunn | Secretary | 21 Mar 1996 | 15 Mar 2002 | British | - |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |