| 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 Iain Gordon Nelson | Director | 1 Mar 1992 | 31 Mar 1992 | British | 83 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 2 Feb 2012 | British | 62 years |
| Andrew Morgan | Director | 17 May 1999 | 15 Feb 2008 | British | 70 years |
| Aniko Mahler | Director | 5 Nov 2015 | 1 Aug 2018 | Hungarian | 50 years |
| Barry Melton | Director | 1 Mar 1992 | 31 Mar 1992 | British | 80 years |
| Brian Robert Keeler | Secretary | 1 Mar 1992 | 26 Jan 1994 | British | - |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Chester Joseph Evans | Director | 16 Mar 1992 | 25 Jan 1994 | American | 79 years |
| Christopher John Sandham | Director | 30 Sept 1993 | 25 Jan 1994 | British | 69 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| Daniel Brett Radice | Director | 25 Mar 2011 | 22 Jun 2012 | British | 59 years |
| David Andrew Defty | Director | 1 Mar 1992 | 16 Mar 1992 | British | 81 years |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 25 Mar 2011 | 2 Feb 2012 | British | 56 years |
| David Lomnitz | Director | 25 Jan 1994 | 30 Apr 1998 | British | 59 years |
| Dennis Malamatinas | Director | 25 Jan 1994 | 20 Sept 1995 | Dutch/greek | 71 years |
| Eric Lomnitz | Director | 25 Jan 1994 | 30 Apr 1998 | American | 98 years |
| Gabor Kovacs | Director | 1 Aug 2018 | 1 Sept 2020 | Hungarian | 46 years |
| Gareth Williams | Director | 25 Oct 1996 | 1 Feb 1999 | British | 73 years |
| Gavin Paul Crickmore | Director | 25 Mar 2011 | 2 Feb 2012 | British | 68 years |
| Howard Stacey Smith | Director | 1 Mar 1992 | 31 Mar 1992 | British | 88 years |
| Ian Anthony Hockney | Director | 1 Oct 2014 | 5 Nov 2015 | British | 51 years |
| Ian Anthony Sexton | Director | 1 Mar 1992 | 31 Mar 1992 | British | 70 years |
| Jeremy John Collis | Director | 25 Jan 1994 | 31 Jul 1994 | British | 75 years |
| John James Nicholls | Director | 25 Mar 2011 | 9 Mar 2018 | British | 64 years |
| John James Nicholls | Secretary | 15 Mar 2002 | 2 Feb 2012 | British | - |
| John Ogilvie Stewart | Director | 27 Jul 1998 | 17 May 1999 | British | 68 years |
| John Quintin Dadd | Director | 31 Mar 1992 | 30 Sept 1993 | British | 83 years |
| Jonathan Alexander Southern | Director | 15 Dec 2000 | 31 Aug 2006 | British | 82 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 |
| Kara Elizabeth Major | Director | 1 Aug 2018 | 22 Dec 2020 | American | 49 years |
| Mark David Peters | Secretary | 1 Jun 1998 | 10 Nov 2000 | British | - |
| Martine Alice Petetin | Secretary | 20 Sept 1995 | 30 Sept 1996 | British | - |
| Matthew John Lester | Director | 7 Apr 2005 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 7 Apr 2005 | 15 Jun 2008 | British | 69 years |
| Michael Garwood Delahooke | Director | 31 Mar 1992 | 25 Jan 1994 | British | 91 years |
| Michael Paul Hitchcock | Director | 20 Sept 1995 | 16 Jan 1998 | British | 58 years |
| Michael Stanley Leathes | Director | 20 Sept 1995 | 1 Mar 1996 | British | - |
| Michael Stanley Leathes | Secretary | 26 Jan 1994 | 20 Sept 1995 | British | - |
| Nandor Makos | Director | 27 Jul 2006 | 1 Aug 2014 | Hungarian | 62 years |
| Nicholas Andrew Travers Hyde | Director | 1 Mar 1992 | 31 Mar 1992 | British | 79 years |
| Nicholas Charles Rose | Director | 12 Mar 1998 | 1 Jul 1999 | British | 69 years |
| Noel Joseph Toolan | Director | 1 Mar 1995 | 20 Sept 1995 | British | 68 years |
| Paul Derek Tunnacliffe | Director | 17 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paul Robert Somers | Director | 1 Feb 1999 | 29 Jun 1999 | British | 73 years |
| Paviter Singh Binning | Director | 15 Dec 2000 | 3 Oct 2003 | British | 66 years |
| Philip John Radcliff | Director | 29 Jun 1999 | 18 Dec 2000 | British | 77 years |
| Phillip Keague Bentley | Director | 1 Jul 1999 | 31 Oct 2000 | British | 67 years |
| Rabbe Ekholm | Director | 20 Sept 1995 | 19 Jan 1998 | Finnish | 71 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Robert Horvath | Director | 12 Dec 1997 | 27 Jul 1998 | Hungarian | 64 years |
| Stephen John Bolton | Director | 1 Apr 2011 | 2 Feb 2012 | British | 64 years |
| Stephen John Carson Cooper | Director | 1 Mar 1992 | 31 Mar 1992 | British | 70 years |
| Susanne Margaret Bunn | Director | 15 Mar 2002 | 4 Jan 2008 | British | 67 years |
| Susanne Margaret Bunn | Secretary | 28 May 1996 | 1 Jun 1998 | British | - |
| Susanne Margaret Bunn | Secretary | 10 Nov 2000 | 15 Mar 2002 | British | - |
| Vassilis Andrikopoulos | Director | 15 Feb 2008 | 6 Dec 2010 | Greek | 54 years |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |