| Aaron Henry Meder | Director | 1 Jul 2015 | 9 Jul 2017 | American | 49 years |
| Ali Reza Toutounchi | Director | 19 Jul 2000 | 31 Dec 2015 | British | 68 years |
| Andrew David Fairhurst | Secretary | 23 Aug 1993 | 1 Oct 2002 | British | - |
| Andrew Kevin Overy | Director | 29 Apr 2003 | 26 Apr 2013 | British | 61 years |
| Andrew Stanton Veitch | Director | 20 Sept 1999 | 14 Nov 2002 | British | 75 years |
| Andrew William Palmer | Director | 30 May 1992 | 20 May 1994 | British | 73 years |
| Anton Norman Karl Eser | Director | 27 Feb 2015 | 30 Aug 2019 | German | 52 years |
| Barry Holman | Director | 30 May 1992 | 31 Mar 2010 | British | 77 years |
| Chad Rakvin | Director | 10 May 2016 | 30 Sept 2019 | American | 55 years |
| Charles Edward Tiplady | Director | 1 Dec 1993 | 1 Dec 1996 | British | 81 years |
| Christopher Peter Chambers | Director | 1 Jan 2006 | 31 Mar 2010 | British | 68 years |
| Christopher Robinson | Director | 1 Dec 1994 | 31 Dec 2004 | British | 80 years |
| Clare Frances Carson | Secretary | 1 Oct 2002 | 29 Aug 2003 | British | - |
| Colin John Reedie | Director | 15 May 2017 | 30 Sept 2019 | British | 58 years |
| David Charles North | Director | 5 Mar 2008 | 4 Jan 2013 | British | 63 years |
| David Michael Shaw | Director | 30 May 1992 | 14 Oct 1994 | British | 81 years |
| David Rough | Director | 30 May 1992 | 31 Dec 2001 | British | 75 years |
| David Scott Manning | Director | 30 May 1992 | 30 Apr 1995 | British | 77 years |
| Emiel Van Den Heiligenberg | Director | 27 Feb 2015 | 30 Sept 2019 | Dutch | 58 years |
| Eric Bernard Adler | Director | 3 Feb 2025 | 14 Oct 2025 | French,american | 58 years |
| Eve Finn | Director | 20 Jan 2016 | 24 Oct 2018 | Irish | 44 years |
| Hugh Peter Bartholomew Cutler | Director | 5 Jun 2013 | 24 Apr 2014 | British | 54 years |
| John Victor Monckton | Director | 12 Feb 1996 | 29 Nov 2004 | British | 71 years |
| John William Roe | Director | 2 Jun 2017 | 30 Sept 2019 | British | 47 years |
| Jonathan Michael Vernon Rashleigh | Director | 30 May 1992 | 18 Nov 1993 | British | 76 years |
| Julian St John Harding | Director | 22 Mar 2011 | 1 Sept 2015 | British | 61 years |
| Julien Randolph Trevenan Garran | Director | 19 Sept 2005 | 8 Aug 2007 | British | 57 years |
| Keith Waltor Bewsey | Director | 10 Sept 1999 | 14 Nov 2002 | British | 74 years |
| Kerrigan William Procter | Director | 31 Mar 2010 | 21 May 2013 | British | 57 years |
| Kevin John Gregory | Director | 14 Nov 2002 | 4 Jul 2012 | British | 69 years |
| Lance Richard Leighton Phillips | Director | 5 Jun 2013 | 10 Oct 2016 | British | 62 years |
| Mark Andrew Burgess | Director | 27 Feb 2003 | 30 Jul 2010 | British | 62 years |
| Mark Joseph Zinkula | Director | 24 Aug 2011 | 15 Jul 2019 | American | 59 years |
| Michael Anthony Christopher Hayden | Director | 15 Nov 2001 | 30 Jan 2009 | Irish | 64 years |
| Michael David Thomas Craston | Director | 11 Feb 2005 | 31 Mar 2010 | British | 68 years |
| Michael David Thomas Craston | Director | 25 May 2011 | 31 Dec 2015 | British | 68 years |
| Michael Jacob Marks | Director | 13 Dec 2016 | 30 Sept 2019 | British | 60 years |
| Michael Jacob Marks | Director | 31 Jul 2022 | 14 Mar 2025 | British | 60 years |
| Michael John Payne | Director | 30 May 1992 | 9 May 1997 | British | 81 years |
| Michelle Bella Barber | Director | N/A | 6 Aug 1993 | British | 74 years |
| Michelle Sylvia Scrimgeour | Director | 9 Sept 2019 | 31 Dec 2024 | British | 63 years |
| Neil Malcolm Higgins | Director | 1 Jun 2006 | 31 Mar 2010 | British | 68 years |
| Peter Julian Lomax | Director | 1 Dec 1996 | 17 Apr 2003 | British | 83 years |
| Peter Nigel Horsman | Director | 30 May 1992 | 1 Dec 1994 | British | 80 years |
| Peter Robert Knapton | Director | 4 Jul 1994 | 31 Jul 2001 | British | 77 years |
| Robert Douglas Whitmore | Director | 1 May 1995 | 12 Feb 1996 | British | 74 years |
| Robert John Churchlow | Director | 10 Nov 2010 | 12 Sept 2013 | British | 61 years |
| Roger Michael Bartley | Director | 21 Aug 2006 | 31 Dec 2015 | British | 74 years |
| Sacha Sadan | Director | 8 Mar 2012 | 31 May 2021 | British | 56 years |
| Sam Fuschillo | Director | 13 Sept 2019 | 28 Oct 2022 | British | 45 years |
| Sarah Frances Elizabeth Aitken | Director | 13 Mar 2015 | 30 Sept 2019 | British | 62 years |
| Simon James Thompson | Director | 1 Mar 2013 | 5 Feb 2016 | British | 59 years |
| Simon Joseph Wilkinson | Director | 4 Feb 2015 | 26 Sept 2018 | British | 54 years |
| Siobhan Geraldine Boylan | Director | 12 Jul 2013 | 18 Jan 2019 | British | 57 years |
| Thomas Andrew Forwood Smith | Secretary | 30 May 1992 | 23 Aug 1993 | British | - |
| Timothy James Breedon | Director | 1 Jan 1994 | 31 Dec 2005 | British | 68 years |
| Vanessa Mary James | Director | 4 Dec 1995 | 8 Dec 2000 | British | 71 years |