| Alan James Stewart | Director | 23 Sept 2014 | 30 Apr 2021 | British | 66 years |
| Alfred David Malpas | Director | 7 Jun 1991 | 21 Feb 1997 | British | 87 years |
| Anders Bertil Mikael Olsson | Director | 1 Nov 2014 | 25 Jun 2021 | Swedish | 69 years |
| Andrew Thomas Higginson | Director | 17 Nov 1997 | 1 Sept 2012 | British | 69 years |
| Byron Elmer Grote | Director | 1 May 2015 | 14 Jun 2024 | British | 78 years |
| Carolyn Julia Mccall | Director | 1 Mar 2005 | 10 Apr 2008 | British | 65 years |
| Charles Lamb Allen | Director | 19 Feb 1999 | 2 Jul 2010 | British | 69 years |
| Charles Wilson | Director | 5 Mar 2018 | 16 Jul 2018 | British | 61 years |
| Darren Elliot Lennark | Secretary | 1 Jul 2016 | 10 Aug 2016 | - | - |
| David Edward Reid | Director | 7 Jun 1991 | 31 Dec 2003 | British | 79 years |
| David Edward Reid | Director | 2 Apr 2004 | 30 Nov 2011 | British | 79 years |
| David John Lewis | Director | 1 Sept 2014 | 30 Sept 2020 | British | 61 years |
| David Thomas Potts | Director | 16 Nov 1998 | 7 Dec 2011 | British | 69 years |
| Deanna Watson Oppenheimer | Director | 1 Mar 2012 | 25 Jun 2021 | British | 68 years |
| Dennis Charles Tuffin | Director | 7 Jun 1991 | 20 May 1994 | British | 93 years |
| Detta O'cathain | Director | 7 Jun 1991 | 15 Jun 2000 | British | 88 years |
| Elizabeth Alison Platt | Director | 1 Apr 2016 | 12 Jun 2025 | British | 64 years |
| Evan Mervyn Davies | Director | 7 Jul 2003 | 31 Oct 2008 | British | 74 years |
| Francis Rudolph Nelson Krejsa | Director | 7 Jun 1991 | 31 Mar 1993 | British | 101 years |
| Gareth Richard Bullock | Director | 2 Jul 2010 | 5 Mar 2015 | British | 73 years |
| Graham Fenwick Pimlott | Director | 1 Mar 1993 | 23 May 2005 | British | 77 years |
| Harald Einsmann | Director | 1 Apr 1999 | 2 Jul 2010 | German | 92 years |
| Ian Charter Maclaurin | Director | 7 Jun 1991 | 6 Jun 1997 | British | 89 years |
| Jacqueline Anne Tammenoms Bakker | Director | 1 Jan 2009 | 28 Feb 2015 | Netherlands | 73 years |
| John Anthony Gardiner | Director | 7 Jun 1991 | 2 Apr 2004 | British | 90 years |
| John Gildersleeve | Director | 7 Jun 1991 | 27 Feb 2004 | British | 82 years |
| John Mario Faskally Padovan | Director | 7 Jun 1991 | 20 May 1994 | British | 88 years |
| John Michael Wemms | Director | 7 Jun 1991 | 15 Jun 2000 | British | 86 years |
| John Murray Allan | Director | 1 Mar 2015 | 16 Jun 2023 | British | 78 years |
| John William Melbourn | Director | 15 Apr 1996 | 14 Jun 2002 | British | 89 years |
| Jonathan Mark Lloyd | Secretary | 18 Jul 2005 | 14 Dec 2006 | British | - |
| Jonathan Mark Lloyd | Secretary | 14 Dec 2006 | 12 Jan 2015 | British | - |
| Karen Rachel Cook | Director | 1 Oct 2004 | 23 Feb 2013 | British | 73 years |
| Kenneth George Hanna | Director | 1 Apr 2009 | 26 Jun 2015 | British | 73 years |
| Kenneth John Hydon | Director | 23 Feb 2004 | 23 Feb 2013 | British | 82 years |
| Laurence Patrick Mcilwee | Director | 27 Jan 2009 | 4 Apr 2014 | British | 64 years |
| Lesley James | Director | 6 Feb 1995 | 30 Apr 1999 | British | 77 years |
| Lindsey Jane Pownall | Director | 1 Apr 2016 | 16 Jun 2023 | British | 64 years |
| Lucy Jeanne Neville-rolfe | Director | 14 Dec 2006 | 2 Jan 2013 | British | 73 years |
| Lucy Jeanne Neville-rolfe | Secretary | 15 Mar 2004 | 14 Dec 2006 | British | - |
| Mark Henry Armour | Director | 2 Sept 2013 | 25 Jun 2021 | British | 72 years |
| Miah Gwynfor Jones | Director | 14 Jan 1992 | 11 Jun 1998 | British | 78 years |
| Michael Darnell | Director | 7 Jun 1991 | 20 May 1994 | British | 93 years |
| Olivia Garfield | Director | 1 Apr 2013 | 28 Feb 2015 | British | 51 years |
| Patrick Jean Pierre Cescau | Director | 1 Feb 2009 | 7 Apr 2015 | French | 78 years |
| Paul Anthony Moore | Secretary | 12 Jan 2015 | 30 Jun 2016 | - | - |
| Philip Andrew Clarke | Director | 16 Nov 1998 | 1 Sept 2014 | British | 66 years |
| Richard John Broadbent | Director | 2 Jul 2011 | 1 Mar 2015 | British | 73 years |
| Richard John Cousins | Director | 1 Nov 2014 | 3 Jan 2017 | British | 67 years |
| Richard William Peter Brasher | Director | 15 Mar 2004 | 15 Mar 2012 | British | 65 years |
| Robert John Welch | Secretary | 10 Aug 2016 | 17 Dec 2024 | - | - |
| Rodney Frank Chase | Director | 1 Jul 2002 | 2 Jul 2010 | British | 83 years |
| Rowley Stuart Ager | Director | 5 Oct 1992 | 27 Feb 2004 | British | 81 years |
| Rowley Stuart Ager | Secretary | 7 Jun 1991 | 15 Mar 2004 | British | - |
| Sara Thomson | Secretary | 17 Dec 2024 | 14 Apr 2025 | - | - |
| Simon Iain Patterson | Director | 1 Apr 2016 | 17 Jun 2022 | British | 53 years |
| Stephen William Golsby | Director | 1 Oct 2016 | 17 Jun 2022 | British | 72 years |
| Stuart John Chambers | Director | 2 Jul 2010 | 26 Jun 2015 | British | 70 years |
| Terence Patrick Leahy | Director | 5 Oct 1992 | 2 Mar 2011 | British | 70 years |
| Timothy John Rollit Mason | Director | 6 Feb 1995 | 6 Dec 2012 | British | 69 years |
| Veronique Morali | Director | 18 Sept 2000 | 28 Feb 2005 | French | 68 years |
| Victor Woolf Benjamin | Director | 7 Jun 1991 | 7 Jun 1996 | British | 91 years |