| Alan David Yuille | Secretary | 9 Dec 2016 | 15 Nov 2018 | - | - |
| Alexander Park Leitch | Director | 27 Apr 2010 | 29 Feb 2012 | British | 79 years |
| Andrea Margaret Blance | Director | 17 Jul 2015 | 9 Dec 2016 | British | 62 years |
| Andrew Mark Parsons | Director | 9 Nov 2012 | 1 Sept 2016 | British | 61 years |
| Andrew Mark Taylor | Director | 1 Apr 1998 | 23 Jun 1999 | British | 60 years |
| Andrew Michael Peck | Director | 24 Jan 2008 | 31 May 2013 | British | 77 years |
| Anthony Pritchard | Director | 1 Apr 1998 | 23 Jun 1999 | British | 64 years |
| Antonio Lorenzo | Director | 2 Mar 2016 | 9 Dec 2016 | Spanish | 60 years |
| Archibald Gerard Kane | Director | 4 Mar 2009 | 19 May 2011 | British | 74 years |
| Brian James Duffin | Director | 24 Jan 2008 | 18 Mar 2010 | British | 71 years |
| Catriona Margaret Herd | Secretary | 25 Mar 2010 | 23 Apr 2014 | British | - |
| Cornelis Antonius Carolus Maria Schrauwers | Director | 14 May 2012 | 18 Nov 2014 | Dutch | 79 years |
| Craig James Thornton | Director | 1 Jun 2013 | 7 Nov 2016 | British | 54 years |
| David James Stanley Oldfield | Director | 18 Jul 2014 | 30 Jun 2015 | British | 64 years |
| David James Walkden | Director | 1 Jan 2012 | 1 Jun 2013 | British | 68 years |
| Deborah Anne Hawkins | Director | 28 Feb 1997 | 1 Jul 2003 | British | 65 years |
| Duncan George Robin Ferguson | Director | 1 Oct 2003 | 31 Dec 2007 | British | 84 years |
| Dunlop James Stewart | Director | 18 Feb 1999 | 5 Jan 2000 | British | 82 years |
| Finian O'boyle | Director | 16 Jul 1997 | 15 Jun 1998 | British | 70 years |
| Gregor Ninian Stewart | Director | 15 Dec 2011 | 5 Oct 2012 | British | 62 years |
| Helen Mary Lakin | Director | 15 Sept 1995 | 20 Sept 1995 | British | 65 years |
| Howard Michael Posner | Director | 1 Jul 2003 | 1 Oct 2003 | British | 70 years |
| Ian Spencer Black | Director | 1 Jul 2003 | 2 Oct 2003 | British | 68 years |
| James Christopher Steuart Hillman | Director | 9 Dec 2016 | 31 Aug 2023 | British | 57 years |
| Jane Elizabeth Mary Curtis | Director | 11 Nov 2014 | 9 Dec 2016 | British | 66 years |
| Jeremy Charles Gillard | Director | 20 Sept 1995 | 1 Jul 2003 | British | 66 years |
| Jeremy Edward Nicholas Butcher | Director | 1 Sept 2023 | 10 Apr 2025 | British | 49 years |
| Jeremy Goford | Director | 27 Apr 2010 | 13 Feb 2015 | British | 81 years |
| Joanne Dawson | Director | 1 Mar 2006 | 26 Mar 2009 | British | 64 years |
| Joanne Margaret Jolly | Secretary | 23 Apr 2014 | 9 Dec 2016 | - | - |
| John David Haslam | Director | 20 Sept 1995 | 21 Mar 1997 | British | 80 years |
| John Francis Hylands | Director | 19 Mar 2015 | 9 Dec 2016 | British | 75 years |
| John Giles Blundell | Director | 20 Sept 1995 | 2 Oct 2003 | British | 63 years |
| John Giles Blundell | Director | 6 Jan 2004 | 6 Oct 2005 | British | 63 years |
| John Keith Bradshaw | Director | 2 Oct 1995 | 2 Oct 2003 | British | 90 years |
| John Neil Maclean | Director | 1 Oct 2003 | 24 Mar 2005 | British | 82 years |
| John Osborne Graves | Director | 28 Feb 1997 | 1 Jul 2003 | English | 71 years |
| John Osborne Graves | Secretary | 21 Sept 1995 | 30 Sept 2003 | English | - |
| John Patrick Hiew | Director | 1 Oct 2003 | 28 Sept 2005 | British | 62 years |
| John Spellman | Director | 10 Nov 2005 | 8 Sept 2006 | British | 60 years |
| John Stephen Edwards | Director | 1 Oct 2003 | 31 Mar 2006 | British | 71 years |
| John Van Der Wielen | Director | 4 Mar 2009 | 25 Mar 2010 | Australian | 60 years |
| Judith Helen Grinsted | Director | 2 Oct 1995 | 19 Dec 1996 | British | 74 years |
| Karin Alexandra Cook | Director | 19 Oct 2015 | 9 Dec 2016 | British | 60 years |
| Kathleen Anne Nealon | Director | 24 Mar 2005 | 31 Dec 2007 | American | 73 years |
| Keith William Abercromby | Director | 1 Oct 2003 | 17 Oct 2005 | British | 62 years |
| Kerr Luscombe | Director | 6 Apr 2010 | 25 May 2011 | British | 61 years |
| Lord (norman Roy) Blackwell | Director | 1 Sept 2012 | 23 Jun 2014 | British | 74 years |
| Malachy Paul Smith | Director | 14 Oct 2005 | 31 Dec 2007 | Irish | 78 years |
| Mark Andrew Fisher | Director | 19 Sept 2012 | 22 Apr 2014 | British | 66 years |
| Mark George Culmer | Director | 31 Oct 2012 | 9 Dec 2016 | British | 64 years |
| Martin Kenneth Staples | Director | 1 Sept 2023 | 10 Apr 2025 | British | 53 years |
| Michael Christophers | Director | 26 Nov 1998 | 2 Oct 2003 | British | 84 years |
| Michael Christophers | Director | 6 Oct 2005 | 9 Dec 2016 | British | 84 years |
| Michael Harris | Director | 1 Sept 2016 | 9 Dec 2016 | British | 61 years |
| Michael Rodney Newton Moore | Director | 1 Oct 2003 | 31 Dec 2007 | British | 90 years |
| Michael Stuart Robinson | Director | 1 Oct 2003 | 28 Sept 2005 | British | 62 years |
| Nicholas Edward Tucker Prettejohn | Director | 23 Jun 2014 | 9 Dec 2016 | British | 66 years |
| Norval Mackenzie Bryson | Director | 27 Apr 2010 | 31 Jul 2015 | British | 77 years |
| Patrick Nigel Christopher Gale | Director | 24 Jan 2008 | 31 Dec 2009 | British | 66 years |
| Paul Gerard Mcnamara | Director | 30 Nov 2005 | 30 Jun 2007 | Irish | 60 years |
| Paul Gittins | Director | 15 Sept 1995 | 20 Sept 1995 | British | 71 years |
| Peter John Veale | Secretary | 30 Sept 2003 | 26 Mar 2009 | British | - |
| Peter Louis Michael Sherwood | Director | 1 Oct 2003 | 31 Dec 2004 | British | 85 years |
| Phil Andrew Hodkinson | Director | 1 Oct 2003 | 28 Jul 2005 | British | 68 years |
| Philip Duncan Loney | Director | 25 Mar 2010 | 27 Sept 2011 | British | 62 years |
| Raymond John Hildreth Milne | Director | 21 Jun 2000 | 30 Jun 2007 | British | 67 years |
| Raymond Nixon | Secretary | 15 Sept 1995 | 21 Sept 1995 | British | - |
| Renato Mazza | Director | 1 Apr 1998 | 23 Jun 1999 | Italian | 63 years |
| Richard John Mcintyre | Director | 9 Dec 2016 | 31 Aug 2023 | British | 60 years |
| Richard Leslie Martin Wohanka | Director | 1 Jun 2013 | 9 Dec 2016 | British | 74 years |
| Robert Alan Devey | Director | 28 Sept 2005 | 1 Jun 2006 | British | 58 years |
| Robert Alan Devey | Director | 10 Oct 2006 | 26 Mar 2009 | British | 58 years |
| Robert James Mackenzie Bulloch | Director | 1 Jan 2012 | 31 Dec 2012 | British | 65 years |
| Roger David Corley | Director | 2 Oct 1995 | 2 Oct 2003 | British | 93 years |
| Rosemary Harris | Director | 25 Aug 2011 | 29 Feb 2012 | British | 68 years |
| Sally Mayer | Secretary | 26 Mar 2009 | 25 Mar 2010 | Other | - |
| Sean William Lowther | Director | 9 Dec 2016 | 31 Dec 2022 | British | 66 years |
| Steven James Colsell | Director | 17 Aug 2006 | 26 Mar 2009 | British | 62 years |
| Susan Ilene Rice | Director | 26 Nov 1998 | 20 Jul 2000 | Other | 80 years |
| Thomas Borthwick | Director | 20 Sept 1995 | 18 Dec 1997 | British | 80 years |
| Thomas Woolgrove | Director | 1 Jun 2006 | 30 Jun 2007 | British | 56 years |
| Toby Emil Strauss | Director | 17 Oct 2011 | 21 Oct 2015 | British | 67 years |
| Trevor Anthony Leonard | Director | 25 Nov 2005 | 5 Apr 2010 | United Kingdom | 67 years |
| Vimlesh Maru | Director | 18 Jun 2013 | 9 Dec 2016 | British | 54 years |
| William Anthony Beadle | Director | 27 Oct 2005 | 17 Aug 2006 | British | 77 years |