| 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 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 |
| Anna Olive Magdelene Manz | Director | 6 Apr 2009 | 1 Sept 2010 | British | 53 years |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Christophe Marie Bernard De Montille | Director | 5 Apr 2012 | 7 Mar 2016 | French | 49 years |
| Christopher Mark Davies | Director | 4 Apr 2011 | 30 Nov 2012 | British | 56 years |
| Christopher Mark Day | Director | 3 Jul 2001 | 31 Aug 2006 | British | 64 years |
| Christopher Richard Roff Marsh | Director | 31 Aug 2006 | 30 Sept 2007 | British | 58 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| Darryl Malcolm Francis Leese | Director | 7 Mar 2016 | 14 Apr 2020 | British | 67 years |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 9 Sept 2010 | 22 Jun 2012 | British | 56 years |
| Deirdre Ann Mahlan | Director | 27 Apr 2007 | 13 Dec 2010 | American | 64 years |
| Gavin Paul Crickmore | Director | 28 Jun 2007 | 1 Oct 2009 | British | 68 years |
| Gavin Paul Crickmore | Director | 4 Apr 2011 | 2 Feb 2012 | British | 68 years |
| Gregory David Kryder | Director | 30 Nov 2012 | 18 Jan 2016 | American | 60 years |
| György Geiszl | Director | 9 Sept 2010 | 4 Apr 2011 | Hungarian | 58 years |
| György Geiszl | Director | 16 Dec 2011 | 22 Jun 2012 | Hungarian | 58 years |
| Hina Patel | Director | 4 Dec 2019 | 29 Jan 2020 | British | 47 years |
| Jakob Ripshtein | Director | 7 Mar 2016 | 15 Jan 2019 | Israeli | 60 years |
| Jill Kyne | Director | 28 Jun 2007 | 29 Jun 2009 | British | 62 years |
| Joel Wayne Walters | Director | 3 Jul 2001 | 14 Jun 2004 | American | 68 years |
| John James Nicholls | Director | 4 Apr 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 | 24 Mar 2011 | 2 Feb 2012 | Spanish | 54 years |
| Matthew John Lester | Director | 31 Jan 2003 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 31 Aug 2006 | 15 Jun 2008 | British | 69 years |
| Micky Rajpal Singh Khurana | Director | 9 Dec 2011 | 5 Apr 2012 | British | 53 years |
| Monika Pais | Director | 3 Oct 2008 | 4 Apr 2011 | Hungarian | 53 years |
| Monika Pais | Director | 16 Dec 2011 | 22 Jun 2012 | Hungarian | 53 years |
| Nandor Makos | Director | 4 Apr 2011 | 1 Aug 2014 | Hungarian | 62 years |
| Paul Derek Tunnacliffe | Director | 7 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paviter Singh Binning | Director | 18 Jul 2001 | 3 Oct 2003 | British | 66 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Robert Joseph Moore | Director | 18 Jul 2001 | 31 Jan 2003 | American | 65 years |
| Roger Hugh Myddelton | Director | 3 Jul 2001 | 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 |
| Susanne Margaret Bunn | Director | 15 Mar 2002 | 4 Jan 2008 | British | 67 years |
| Susanne Margaret Bunn | Secretary | 3 Jul 2001 | 15 Mar 2002 | British | - |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |