| Alan Drysdale Sneddon | Director | 16 May 1991 | 8 Mar 1997 | British | 94 years |
| Andrew Nicholas Russell | Director | 31 Mar 2011 | 30 Nov 2011 | British | 59 years |
| Andrew Stewart Carter | Director | 31 Jul 2013 | 12 Apr 2021 | British | 66 years |
| Caroline Jane Wood | Secretary | 22 Dec 2004 | 19 Jan 2005 | British | - |
| Christopher William Joseph Hirst | Director | 16 May 1991 | 31 Mar 2005 | British | 81 years |
| Clare Louise Gosling | Director | 22 Feb 2012 | 31 Jul 2013 | British | 53 years |
| David Grattan | Director | 4 May 1998 | 7 Nov 2002 | British | 72 years |
| David Stuart Hollas | Director | 16 May 1991 | 8 Nov 2002 | British | 85 years |
| Ernest Chesworth | Secretary | 16 May 1991 | 8 Mar 1994 | British | - |
| Gareth Richard Stewart Dickinson | Director | 31 Jul 2013 | 10 Feb 2020 | British | 56 years |
| Gordon Wild | Director | 16 May 1991 | 2 May 1998 | British | 88 years |
| Ian Michael Jones | Director | 7 Nov 2002 | 1 Feb 2007 | British | 63 years |
| Ian Michael Jones | Secretary | 8 Mar 1994 | 11 Mar 2002 | British | - |
| John Franks | Director | 16 Mar 1999 | 1 Feb 2007 | British | 75 years |
| John Mercer | Director | 30 Jul 2010 | 1 Aug 2014 | British | 64 years |
| Kathrine Jane Bancroft | Secretary | 19 Jul 2010 | 31 Jul 2013 | - | - |
| Lesley Mitchell | Director | 4 Jun 2020 | 14 Oct 2022 | British | 51 years |
| Martyn Christopher Bennett | Director | 31 Mar 1998 | 7 Nov 2002 | British | 80 years |
| Michael Brian Horswell | Director | 16 May 1991 | 27 Mar 1999 | British | 87 years |
| Moira Ann Lees | Secretary | 13 Jan 2006 | 19 Jul 2010 | British | - |
| Patricia Anne Wade | Director | 7 Nov 2002 | 13 Jan 2006 | British | 71 years |
| Patricia Anne Wade | Secretary | 11 Mar 2002 | 13 Jan 2006 | British | - |
| Paul Sharman | Director | 27 Apr 2005 | 30 Jul 2010 | British | 74 years |
| Peter Douglas Johnson | Director | 16 May 1991 | 15 Apr 1994 | British | 97 years |
| Peter William Kerns | Director | 1 Feb 2007 | 31 Dec 2009 | British | 73 years |
| Richard Thomas Goddard | Director | 1 Feb 2007 | 31 Mar 2011 | British | 69 years |
| Rodney James Burgess | Director | 29 Mar 1999 | 13 Dec 2003 | British | 83 years |
| Stephen Fitzmaurice Wood | Director | 16 May 1991 | 6 Mar 1999 | British | 88 years |
| Timothy Stephen Bunch | Director | 1 Oct 1994 | 7 Nov 2002 | British | 73 years |
| William Edward Newby | Director | 10 Nov 2010 | 21 Jun 2013 | British | 67 years |
| William Frederick Webb | Director | 18 Apr 1994 | 28 Mar 1998 | British | 89 years |