| Adrian Rodney Gifford Shields | Director | 22 May 2018 | 3 Dec 2021 | British | 57 years |
| Andrew Peter Shortis | Director | 1 Apr 1995 | 14 Nov 1997 | British | 67 years |
| Anthony Roger Jinks | Director | 29 Mar 2010 | 11 Jan 2011 | British Canadian | 75 years |
| Anthony Tomljanovic | Director | 29 Mar 2010 | 13 Apr 2010 | United States | 58 years |
| Barry Canfield | Director | 1 Apr 2000 | 13 Jul 2011 | British | 68 years |
| Brian Richard Mayberry | Director | 1 Apr 1995 | 1 Nov 1996 | British | 75 years |
| Charles Edward Llewellyn Humphries | Director | 7 Apr 2022 | 18 Jan 2024 | British | 47 years |
| Charles Stuart Raistrick | Director | 25 Jun 1992 | 1 Jan 1993 | British | 78 years |
| Chris Luck | Director | 1 Apr 1995 | 20 Sept 1995 | British | 79 years |
| Christopher Farman | Director | 1 Apr 1995 | 30 Jun 1996 | British | 69 years |
| Christopher Laskey Fidler | Secretary | 29 Mar 2010 | 22 Jul 2016 | - | - |
| Christopher Michael Green | Director | 13 Feb 2004 | 4 Oct 2005 | British | 72 years |
| Clare Brown | Director | 25 Jun 1992 | 1 Apr 1995 | British | 76 years |
| Clare Brown | Secretary | 25 Jun 1992 | 1 Apr 1995 | British | - |
| Colin Ross Fleming | Director | 29 May 2015 | 1 Oct 2017 | British | 67 years |
| David Alexander Menon | Director | 29 Mar 2010 | 13 Jul 2011 | British | 62 years |
| David John Watson | Director | 1 Jan 1993 | 1 Apr 1995 | British | 82 years |
| David John Watson | Secretary | 1 Apr 1995 | 30 Jun 2000 | British | - |
| Deborah Barrow | Director | 30 Nov 2017 | 21 Sept 2022 | American | 74 years |
| Diane Morton | Director | 4 Jan 1999 | 31 Dec 2002 | British | 64 years |
| Douglas Robert Morton | Director | 1 Apr 1995 | 13 Jul 2011 | British | 66 years |
| Elaine Moore | Director | 29 Mar 2010 | 13 Jul 2011 | American | 80 years |
| Graeme Bruce Sleigh | Director | 17 Sept 2013 | 30 Nov 2017 | British | 56 years |
| Hisham Helmi Hussein Mahmoud | Director | 11 Jan 2011 | 13 Jul 2011 | American | 60 years |
| Iain Angus Jones | Secretary | 16 Feb 2018 | 21 Sept 2022 | - | - |
| Ian Cochrane Taylor | Director | 1 Apr 1995 | 31 Dec 2001 | British | 78 years |
| Jennifer Ann Warburton | Secretary | 22 Jul 2016 | 16 Feb 2018 | - | - |
| John Anthony Foster | Director | 1 Apr 1995 | 31 Dec 1996 | British | 81 years |
| John Arthur Cuthbert | Director | 13 Feb 2004 | 4 Oct 2005 | British | 73 years |
| John James Clarke | Director | 28 Apr 2010 | 10 Sept 2013 | British | 61 years |
| Karen Anne Sewell | Secretary | 21 Sept 2022 | 6 Mar 2025 | - | - |
| Kendall Harris Sherrill | Director | 1 Oct 2017 | 21 Sept 2022 | American | 69 years |
| Mark Justin Williams | Director | 1 Jan 2012 | 29 May 2015 | British | 49 years |
| Mark William Naysmith | Director | 21 Sept 2022 | 16 Dec 2024 | British | 60 years |
| Martin Parker | Secretary | 30 Jun 2000 | 8 Aug 2002 | British | - |
| Martin Parker | Secretary | 1 Apr 2004 | 4 Oct 2005 | British | - |
| Melanie Walters | Director | 1 Apr 1995 | 4 Jan 1999 | British | 69 years |
| Philip Henry Bourne | Director | 13 Jul 2011 | 16 Sept 2013 | British | 59 years |
| Richard Andrew Mclaren | Director | 13 Jul 2011 | 27 Mar 2015 | British | 60 years |
| Robert Philip Brown | Director | 17 Sept 2013 | 2 Aug 2021 | British | 58 years |
| Samuel Ian Cromie | Director | 22 May 2018 | 31 Dec 2022 | British | 60 years |
| Sandra Lilian Oliver | Secretary | 8 Aug 2002 | 29 Mar 2010 | British | - |
| Simon Patrick John Francis Armes-reardon | Director | 16 Feb 1995 | 13 Jul 2011 | British | 71 years |
| Tarun Bafna | Director | 23 Apr 2010 | 13 Jul 2011 | American | 61 years |