| Alan Charles Young | Director | 3 Sept 1999 | 27 Oct 2004 | British | 74 years |
| Amanda Dawn Lancaster | Secretary | 4 Jan 2005 | 28 Jul 2006 | British | - |
| Benjamin John Guyatt | Director | 30 Nov 2009 | 1 Jun 2011 | British | 51 years |
| Carsten Matthias Wendt | Director | 1 Dec 2016 | 6 Sept 2021 | German | 50 years |
| Christian Leclercq | Director | 2 Jun 2008 | 31 Mar 2010 | Belgian | 61 years |
| David Graham Holden | Director | 30 Jan 2004 | 4 Jan 2005 | British | 67 years |
| David Graham Holden | Secretary | 8 Jun 1992 | 23 Jul 1998 | British | - |
| David John Szymanski | Director | 4 Jan 2005 | 30 Nov 2009 | British | 72 years |
| David Jonathan Clarke | Director | 1 Jun 2011 | 1 Dec 2016 | British | 52 years |
| George Brian Taylor | Secretary | 14 Dec 1991 | 8 Jun 1992 | British | - |
| George Ian Mcculloch | Director | 3 Sept 1999 | 17 Dec 2004 | British | 82 years |
| Graham Dransfield | Director | 28 Jul 2006 | 30 Jun 2008 | British | 75 years |
| Graham Dransfield | Secretary | 10 Dec 2007 | 30 Jun 2008 | British | - |
| Ian David Burrell | Secretary | 4 Dec 2003 | 4 Jan 2005 | British | - |
| Ian Tanser | Director | 13 Jul 2000 | 10 Sept 2004 | British | 67 years |
| James Norman Clarkson | Director | 9 Oct 2002 | 11 Jul 2003 | British | 53 years |
| John Michael Speak | Director | 14 Dec 1991 | 3 Sept 1999 | British | 77 years |
| Jonathan David Cook | Director | 13 Jun 2008 | 30 Nov 2009 | British | 49 years |
| Justin Ashley Lockwood | Director | 30 Jan 2004 | 4 Jan 2005 | British | 56 years |
| Keith Farrar Marshall | Director | 14 Dec 1991 | 28 Feb 1995 | British | 91 years |
| Michael Geoffrey Lancaster | Director | 14 Dec 1991 | 12 Dec 1996 | British | 77 years |
| Michael John King | Director | 3 Jan 1996 | 30 Sept 2000 | British | 87 years |
| Michael Wignall | Director | 3 Mar 2003 | 4 Jan 2005 | British | 68 years |
| Paul Derek Tunnacliffe | Secretary | 28 Jul 2006 | 10 Dec 2007 | British | - |
| Philip David Marshall | Director | 28 Feb 1995 | 6 Nov 2000 | British | 66 years |
| Richard Blair Illingworth | Director | 1 Mar 1999 | 18 Feb 2002 | British | 63 years |
| Richard Charles Monro | Director | 12 Nov 2002 | 4 Dec 2003 | British | 68 years |
| Richard Charles Monro | Secretary | 23 Jul 1998 | 4 Dec 2003 | British | - |
| Richard Robert Gimmler | Director | 1 Oct 2005 | 30 Jun 2008 | British | 59 years |
| Robert Wood | Director | 4 Jan 2005 | 30 Sept 2005 | British | 60 years |
| Roger Thomas Virley Tyson | Secretary | 31 Jul 2008 | 10 Mar 2016 | British | - |
| Seyda Pirinccioglu | Director | 19 Jul 2010 | 31 Aug 2013 | Turkish | 55 years |
| Stuart Edgar Bell | Director | 14 Dec 1991 | 4 Jan 2005 | British | 80 years |
| Wendy Jane Trott | Director | 4 Jan 2005 | 24 Dec 2008 | British | 60 years |