| Andrew David John Moffat | Director | 7 Apr 2004 | 31 May 2012 | British | 61 years |
| Anthony Roger May | Director | 16 Sept 1997 | 1 Jun 1999 | British | 77 years |
| Anthony Whalley | Director | 1 Dec 1994 | 16 Sept 1997 | British | 85 years |
| Biswajit Das | Secretary | 28 Apr 1995 | 30 Oct 1998 | British | - |
| Brian William Cromie | Director | 17 Jan 1993 | 14 Feb 1995 | English | 97 years |
| Carolyn Holbrook | Director | 19 May 2004 | 9 Apr 2009 | British | 74 years |
| Christopher John Huxtable | Director | 9 Apr 2009 | 30 Apr 2011 | British | 62 years |
| Christopher William Taylor Young | Director | 17 Jan 1993 | 17 Feb 1997 | British | 92 years |
| David Edwin Potter | Director | 17 Jan 1993 | 14 Feb 1995 | British | 83 years |
| David John Cavanna | Director | 17 Oct 2013 | 31 Dec 2015 | British | 59 years |
| David Richard Louis Duncan | Director | 17 Jan 1993 | 17 Feb 1997 | British | 91 years |
| Edward Douglas Glover | Director | 1 Jun 1999 | 20 Aug 2012 | British | 73 years |
| Edward George Cox | Director | 17 Jan 1993 | 1 Jun 1999 | British | 93 years |
| Frances Julie Niven | Secretary | 14 Jul 2005 | 27 Apr 2006 | British | - |
| Geoffrey Donald Sims | Director | 17 Jan 1993 | 14 Feb 1995 | British | 100 years |
| Hannah Elizabeth Shepherd | Secretary | 5 Jan 2015 | 13 Aug 2015 | - | - |
| Helen Forster | Secretary | 27 Apr 2006 | 19 Jul 2006 | British | - |
| James Robertson Stewart | Director | 17 Jan 1993 | 14 Feb 1995 | British | 109 years |
| Jill Nicola Nicholls | Director | 17 Jan 1993 | 1 Dec 1994 | British | 68 years |
| John Penberthy Craze | Secretary | 1 Jun 1999 | 30 Nov 2000 | British | - |
| Karen Lyon | Secretary | 28 Apr 2011 | 4 Apr 2013 | - | - |
| Katherine Dean | Secretary | 4 Apr 2013 | 13 Aug 2014 | - | - |
| Laurence Edwin Hayes | Director | 1 May 2009 | 30 Nov 2011 | British | 50 years |
| Leslie Francis German | Secretary | 17 Jan 1993 | 28 Apr 1995 | British | - |
| Linda May Law | Secretary | 30 Oct 1998 | 1 Jun 1999 | British | - |
| Louisa Jane Jenkinson | Secretary | 19 Jul 2006 | 13 Feb 2007 | British | - |
| Louisa Jane Jenkinson | Secretary | 11 Nov 2002 | 3 Nov 2003 | British | - |
| Michael Connelly Anderson | Director | 19 Jan 2016 | 22 Mar 2017 | British | 64 years |
| Nicola Suzanne Black | Secretary | 1 Dec 2000 | 11 Nov 2002 | British | - |
| Philip Miller | Secretary | 13 Feb 2007 | 9 Sept 2009 | British | - |
| Rebecca Louise Poole | Secretary | 3 Nov 2003 | 14 Jul 2005 | British | - |
| Richard John Cole | Director | 30 May 2012 | 6 Jul 2017 | British | 72 years |
| Simon David Ringer | Director | 12 Feb 2001 | 1 May 2001 | British | 62 years |
| Simon Peter De Albuquerque | Director | 8 Aug 2001 | 5 Mar 2008 | British | 74 years |
| Stephen Owen | Secretary | 9 Sept 2009 | 28 Apr 2011 | Other | - |
| Thomas Roland Plant | Director | 17 Jan 1993 | 1 Jun 1999 | British | 70 years |
| Timothy Geoffrey Thorp | Director | 8 Aug 2001 | 9 Apr 2009 | British | 62 years |
| Tony Bhambhra | Secretary | 13 Aug 2014 | 5 Jan 2015 | - | - |
| Werner Marc Friedrich Von Guionneau | Director | 1 Jun 1999 | 10 Jul 2012 | German | 69 years |