| Alan Paul Busson | Secretary | 21 Mar 2006 | 29 Sept 2006 | British | - |
| Alexander Park Leitch | Director | 9 Aug 1991 | 9 Dec 1991 | British | 79 years |
| Amanda Louise Knott | Secretary | 29 Sept 2006 | 22 May 2013 | British | - |
| Andrew Ralph Humphries | Director | 25 Jan 1999 | 11 Oct 2000 | British | 62 years |
| Andrew Wallace | Director | 9 Aug 1991 | 12 Oct 1998 | British | 77 years |
| Ann Claire Blundell | Secretary | 22 May 2013 | 10 Feb 2014 | - | - |
| Anthony Paul Kenmir | Director | 23 Nov 1998 | 1 Jul 2005 | British | 70 years |
| Brian Hamilton Metters | Director | 9 Aug 1991 | 8 Aug 1991 | British | 84 years |
| Corina Katherine Ross | Secretary | 10 Feb 2011 | 22 May 2013 | British | - |
| Dennis Astbury Vickers | Director | 30 May 2002 | 30 Sept 2004 | British | 76 years |
| Dermot John Mckeever | Director | 25 Jan 1999 | 31 May 2003 | British | 67 years |
| Geoffrey Alan Fletcher | Director | 9 Aug 1991 | 20 Dec 1995 | British | 75 years |
| George Higginson | Director | 30 May 2002 | 1 Jul 2005 | British | 63 years |
| Helen Frances Leigh Rogers | Secretary | 14 Jul 2008 | 2 Dec 2011 | British | - |
| Iain Daniel Macrae Wright | Director | 22 Jun 2001 | 21 Oct 2005 | British | 76 years |
| Ian Graham Seward | Director | 9 Dec 1991 | 1 Jan 1998 | British | 79 years |
| Ian Ritchie | Secretary | 22 May 2013 | 10 Feb 2014 | - | - |
| Jacqueline Clare Bennett | Director | 29 Nov 1996 | 12 Oct 1998 | British | 64 years |
| James Douglas Sutherland | Director | 28 Jun 2013 | 20 Oct 2017 | British | 52 years |
| Jayne Michelle Meacham | Secretary | 1 Nov 2006 | 2 May 2008 | British | - |
| John Peter Jewitt | Director | 1 Jan 1998 | 18 Dec 1998 | British | 72 years |
| Jonathan Vaughan-williams | Director | 25 Mar 2014 | 28 Apr 2017 | British | 59 years |
| Kate Mary Elizabeth Brightmore | Secretary | 5 Oct 2004 | 21 Mar 2006 | British | - |
| Kevin Hugh Ronaldson | Director | 12 Oct 1998 | 13 Jan 2003 | British | 68 years |
| Kevin Robert Goodenough | Director | 12 Oct 1998 | 29 Jan 2010 | British | 73 years |
| Lawrence Churchill | Director | 9 Aug 1991 | 1 Oct 1991 | British | 80 years |
| Neil James Evans | Director | 29 Jan 2010 | 25 Mar 2014 | British | 69 years |
| Nelson Gary Tarleton | Director | 1 Jan 1996 | 29 Nov 1996 | British | 70 years |
| Nigel Lowe | Director | 21 Jan 2011 | 28 Jun 2013 | British | 74 years |
| Peter Charles Howe | Secretary | 9 Aug 1991 | 5 Oct 2004 | British | - |
| Peter Ellen | Director | 9 Dec 1991 | 20 Dec 1995 | British | 74 years |
| Peter Ellen | Director | 25 Sept 2000 | 29 Jun 2001 | British | 74 years |
| Phil Andrew Hodkinson | Director | 1 Jan 1998 | 18 Dec 1998 | British | 68 years |
| Philip Martin Lockyer | Director | 29 Nov 1996 | 31 Mar 1999 | British | 74 years |
| Philip Smith | Director | 9 Dec 1991 | 29 Nov 1996 | British | 79 years |
| Richard David Freeman | Director | 25 Mar 1999 | 21 May 2002 | British | 72 years |
| Valentine Mark Sheridan | Director | 1 Jul 2005 | 21 Jan 2011 | British | 67 years |