| Alison Ann Hargreaves | Secretary | 9 Aug 1993 | 13 Aug 1999 | British | - |
| Amelia Mary Bright | Director | 17 Jan 2022 | 11 Mar 2022 | British | 40 years |
| Anna Clare Bond | Director | 1 Jul 2020 | 14 Jan 2022 | British | 45 years |
| Anna Clare Bond | Director | 1 Dec 2022 | 5 Apr 2024 | British | 45 years |
| Caroline Mary Tolhurst | Secretary | 13 Aug 1999 | 1 Jul 2008 | British | - |
| Chantal Antonia Henderson | Director | 17 Oct 2014 | 31 Dec 2019 | British | 51 years |
| Charles Annand Fraser | Director | 24 Sept 1991 | 31 Dec 1991 | British | 98 years |
| Christopher James Jukes | Director | 5 Sept 2019 | 31 Dec 2019 | British | 48 years |
| Christopher James Jukes | Director | 1 Jul 2020 | 30 Nov 2022 | British | 48 years |
| Colin John Redman | Director | 2 Jun 1997 | 10 Apr 2000 | British | 80 years |
| Craig David Mcwilliam | Director | 1 Jul 2010 | 1 May 2014 | British | 54 years |
| Craig David Mcwilliam | Director | 28 Apr 2016 | 10 Jan 2020 | British | 54 years |
| Darren James Patrick Rawcliffe | Director | 19 Feb 2007 | 1 Jul 2008 | British | 58 years |
| David Alan Sivewright | Director | 21 Feb 2011 | 24 Dec 2013 | British | 64 years |
| David John Yaldron | Director | 3 Dec 2012 | 28 Apr 2017 | British | 52 years |
| Deborah Clare Lee | Director | 17 Oct 2014 | 5 Sept 2019 | British | 50 years |
| Deborah Clare Lee | Director | 28 Nov 2022 | 20 May 2024 | British | 50 years |
| Derek John Lewis | Secretary | 7 Jun 2018 | 31 Mar 2022 | - | - |
| Douglas Robert Jan De Broekert | Director | 24 Sept 1991 | 31 Dec 1998 | British | 87 years |
| Geoffrey Hammond | Director | 24 Sept 1991 | 31 Dec 1999 | British | 87 years |
| Geoffrey Harold Benjamin Carter | Director | 24 Sept 1991 | 31 Dec 1991 | British | 97 years |
| George David Hoare | Director | 24 Sept 1991 | 30 Nov 1991 | British | 97 years |
| George Ian Macloy Cockburn | Director | 1 Apr 1993 | 31 Dec 1997 | British | 81 years |
| Heather Caryn Topel | Director | 17 Jan 2022 | 30 Nov 2022 | British,american | 48 years |
| Ian Douglas Mair | Director | 3 Dec 2012 | 20 Jun 2014 | British | 53 years |
| Ian Michael Philip Staines | Director | 24 Sept 1991 | 31 Dec 1991 | British | 95 years |
| James Gilles Raynor | Director | 1 Jan 2020 | 30 Jun 2020 | British | 53 years |
| Jeremy David Tredennick Titchen | Director | 1 Jul 1998 | 10 Jun 2005 | British | 63 years |
| Jeremy Henry Moore Newsum | Director | 24 Sept 1991 | 10 Apr 2000 | British | 71 years |
| John Edward Irvine | Director | 1 Oct 1992 | 31 Mar 2010 | British | 70 years |
| John James | Director | 24 Sept 1991 | 31 Dec 1991 | British | 91 years |
| Jonathan Osborne Hagger | Director | 1 Jan 1992 | 10 Apr 2000 | British | 77 years |
| Jorge Emanuel Mendonca | Director | 21 May 2018 | 23 Oct 2020 | British | 63 years |
| Katharine Emma Robinson | Secretary | 1 Jul 2008 | 7 Jun 2018 | British | - |
| Leslie Sidney Brooks | Director | 1 Jan 1992 | 31 Mar 1992 | British | 94 years |
| Mark Robin Preston | Director | 30 Jun 2006 | 30 Jun 2008 | British | 58 years |
| Martin Aldred | Director | 24 Sept 1991 | 31 Mar 2000 | British | 81 years |
| Michael John Baker | Director | 1 Mar 2007 | 30 Jun 2009 | British | 63 years |
| Michael Leonard Galloway | Director | 3 May 1994 | 16 Mar 2001 | British | 82 years |
| Nicholas Charles Miller | Director | 1 Jan 1992 | 22 Dec 1993 | British | 77 years |
| Peter Sean Vernon | Director | 30 Jun 2006 | 31 Dec 2016 | British | 67 years |
| Rachel Dickie | Director | 16 Dec 2020 | 7 Sept 2021 | British | 42 years |
| Rachel Dickie | Director | 23 Mar 2022 | 31 Mar 2025 | British | 42 years |
| Raymond Charles Williams | Director | 10 Mar 2000 | 31 Mar 2009 | British | 73 years |
| Richard Charles Mander | Director | 31 Mar 2009 | 30 Sept 2011 | British | 58 years |
| Richard Ian Powell | Director | 26 Feb 2014 | 28 Apr 2016 | British | 58 years |
| Richard Simon Handley | Director | 10 Apr 2000 | 3 Apr 2008 | British | 72 years |
| Roger Frederick Crawford Blundell | Director | 3 Apr 2008 | 25 Nov 2022 | British | 64 years |
| Sarah-jane Curtis | Director | 10 Apr 2000 | 13 Sept 2002 | British | 63 years |
| Simon Duncan Armstrong | Director | 30 Sept 2011 | 30 Sept 2011 | British | 58 years |
| Simon Geoffrey Harding-roots | Director | 28 Apr 2016 | 30 Jun 2020 | British | 58 years |
| Stephen Howard Rhodes Musgrave | Director | 1 May 1995 | 30 Jun 2006 | British | 73 years |
| Ulrike Schwarz-runer | Director | 1 Feb 2011 | 28 Apr 2016 | Austrian | 55 years |
| William John Ashworth Bullough | Director | 1 Jan 1992 | 28 Sept 2007 | British | 76 years |
| William Robert Bax | Director | 5 Jan 2017 | 1 Jun 2018 | British | 48 years |
| William Robert Holland | Secretary | 24 Sept 1991 | 9 Aug 1993 | British | - |