| Alan Clifford Levings | Secretary | 27 Sept 1992 | 11 Aug 1995 | British | - |
| Andrew Neville Joy | Director | 27 Sept 1992 | 5 Feb 2013 | British | 69 years |
| Andrew William Marchant | Director | 27 Sept 1992 | 23 Jul 2001 | British | 71 years |
| Barry John Southcott | Director | 26 Oct 1993 | 31 Oct 1995 | British | 76 years |
| Brian Andrew Linden | Director | 27 Sept 1992 | 21 Oct 2013 | British | 70 years |
| Charles Dumaresq Nicholson | Director | 27 Sept 1992 | 29 Jan 1999 | British | 74 years |
| David Nigel Beevor | Director | 25 May 1993 | 31 Oct 1995 | British | 85 years |
| George Alexander Bruce | Director | 30 Oct 1995 | 21 Dec 2009 | British | 68 years |
| Gerard Christopher Lane | Director | 1 Jul 2011 | 26 Feb 2018 | British | 65 years |
| Graham James Keniston-cooper | Director | 27 Sept 1993 | 7 Feb 2003 | British | 68 years |
| Guy Bryce Davison | Director | 27 Sept 1992 | 17 Feb 2012 | British | 69 years |
| Hugh Macgillivray Langmuir | Director | N/A | 17 Feb 2012 | British,french | 71 years |
| John Forster Brown | Director | 27 Sept 1992 | 31 Dec 2001 | British | 74 years |
| Jonathan George Gough Clarke | Director | 27 Sept 1992 | 19 Nov 2007 | British | 68 years |
| Keith Alexander Wylie | Director | 27 Sept 1992 | 3 May 1993 | British | 76 years |
| Kevin John Whale | Director | 18 Mar 2013 | 29 Jun 2015 | British | 67 years |
| Kevin John Whale | Secretary | 29 Feb 1996 | 18 Mar 2013 | British | - |
| Lorraine Anne London | Director | 29 Jun 2015 | 30 Sept 2021 | British | 61 years |
| Mark Geoffrey William Burgess | Director | 27 Sept 1992 | 29 Feb 1996 | British | 67 years |
| Mark Geoffrey William Burgess | Secretary | 11 Aug 1995 | 29 Feb 1996 | British | - |
| Michael John Hensman | Director | 1 Jan 2010 | 30 Apr 2011 | British | 76 years |
| Nigel Brentwood Wheeler | Director | 27 Sept 1992 | 17 Nov 2004 | British | 75 years |
| Paul Michael Whitney | Director | 27 Sept 1992 | 26 Oct 1993 | British | 78 years |
| Philip John Maskell | Director | 27 Sept 1992 | 14 Jul 1995 | British | 67 years |
| Richard James Munton | Director | 27 Sept 1992 | 4 Oct 2007 | British | 70 years |
| Robin Alexander Hall | Director | 27 Sept 1992 | 9 Feb 2015 | British | 78 years |
| Simon Nicholas Rowlands | Director | 27 Sept 1992 | 22 Mar 2012 | British | 69 years |
| Stephen Paul Trickett | Director | 30 Oct 1995 | 16 Mar 1998 | British | 69 years |
| Yagnish Vrajlal Chotai | Director | 22 Nov 1996 | 23 Jun 2008 | British | 67 years |