| Alison Ann Hargreaves | Secretary | 9 Aug 1993 | 13 Aug 1999 | British | - |
| Amelia Mary Bright | Director | 7 Jul 2017 | 22 Oct 2020 | British | 40 years |
| Amelia Mary Bright | Director | 1 Jul 2021 | 11 Mar 2022 | British | 40 years |
| Amelia Mary Bright | Director | 10 Oct 2022 | 12 Dec 2024 | British | 40 years |
| Anna Clare Bond | Director | 12 Apr 2016 | 23 Aug 2019 | British | 45 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 | - |
| Catherine Susan Stevenson | Director | 22 Dec 2010 | 7 Jul 2017 | British | 43 years |
| Chantal Antonia Henderson | Director | 17 Oct 2014 | 31 Dec 2019 | British | 51 years |
| Chantal Antonia Henderson | Director | 1 Jul 2020 | 3 Nov 2025 | British | 51 years |
| Christopher James Jukes | Director | 1 Jul 2020 | 30 Nov 2022 | British | 48 years |
| Craig David Mcwilliam | Director | 7 Nov 2013 | 10 Jan 2020 | British | 54 years |
| David Yaldron | Director | 3 Dec 2012 | 7 Nov 2013 | British | 52 years |
| Deborah Clare Lee | Director | 1 Apr 2022 | 10 Oct 2022 | British | 50 years |
| Derek John Lewis | Secretary | 7 Jun 2018 | 31 Mar 2022 | - | - |
| Douglas Nigel Crichton | Director | 28 Apr 2016 | 31 Aug 2020 | British | 50 years |
| Douglas Robert Jan De Broekert | Director | 13 Oct 1994 | 31 Dec 1998 | British | 87 years |
| Gary James Powell | Director | 11 Jan 2010 | 3 Dec 2012 | British | 52 years |
| Geoffrey Hammond | Director | 13 Oct 1994 | 31 Dec 1999 | British | 87 years |
| Giles Andrew Clarke | Director | 11 Jan 2010 | 7 Nov 2013 | British | 59 years |
| Haydn John Cooper | Director | 4 Jun 2013 | 19 Feb 2016 | British | 45 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 Robert Morrison | Director | 15 Nov 2010 | 7 May 2015 | British | 54 years |
| James Gilles Raynor | Director | 30 Sept 2019 | 30 Jun 2020 | British | 53 years |
| Jenefer Dawn Greenwood | Director | 15 Nov 2010 | 31 Dec 2012 | British | 69 years |
| Jeremy David Tredennick Titchen | Director | 13 Feb 1998 | 10 Jun 2005 | British | 63 years |
| Jeremy Henry Moore Newsum | Director | 12 Mar 1993 | 13 Oct 1994 | British | 71 years |
| John Edward Thompson Clark | Director | 11 Jan 2010 | 17 Oct 2014 | British | 57 years |
| John Francis Reid | Director | 12 Apr 2016 | 30 Aug 2019 | British | 52 years |
| John James | Director | 26 Jul 1991 | 12 Mar 1993 | British | 91 years |
| Jonathan Osborne Hagger | Director | 26 Jul 1991 | 13 Oct 1994 | British | 77 years |
| Jorge Emanuel Mendonca | Director | 7 Nov 2013 | 21 May 2018 | British | 63 years |
| Jorge Emanuel Mendonca | Director | 1 Jul 2020 | 23 Oct 2020 | British | 63 years |
| Katharine Emma Robinson | Director | 1 Jul 2008 | 1 Jul 2008 | British | 62 years |
| Katharine Emma Robinson | Secretary | 1 Jul 2008 | 7 Jun 2018 | British | - |
| Keith John Bailey | Director | 1 Aug 2014 | 31 Dec 2019 | British | 47 years |
| Lauren Ruth Buck | Director | 11 Jan 2010 | 15 Nov 2010 | British | 55 years |
| Mark Robin Preston | Director | 30 Jun 2006 | 30 Jun 2008 | British | 58 years |
| Martin Aldred | Director | 13 Oct 1994 | 31 Mar 2000 | British | 81 years |
| Nigel Auriol Hughes | Director | 15 Nov 2010 | 27 Mar 2019 | British | 69 years |
| Paul Francis O'grady | Director | 7 Jul 2017 | 20 Oct 2023 | British | 41 years |
| Peter Sean Vernon | Director | 26 Jun 2006 | 1 Oct 2007 | British | 67 years |
| Peter Sean Vernon | Director | 1 Jul 2008 | 31 Dec 2016 | British | 67 years |
| Raymond Charles Williams | Director | 31 Dec 1999 | 31 Mar 2009 | British | 73 years |
| Richard Alexander Jefferies | Director | 11 Jan 2016 | 31 Dec 2019 | British | 63 years |
| Richard Simon Handley | Director | 31 Dec 1999 | 3 Apr 2008 | British | 72 years |
| Roger Frederick Crawford Blundell | Director | 3 Apr 2008 | 30 Jun 2020 | British | 64 years |
| Sarah-jane Curtis | Director | 11 Jan 2010 | 15 Nov 2010 | British | 63 years |
| Sarah-jane Curtis | Director | 16 Nov 2010 | 16 Nov 2010 | British | 63 years |
| Simon Geoffrey Harding-roots | Director | 28 Apr 2016 | 31 Dec 2019 | British | 58 years |
| Simon Richard Elmer | Director | 11 Jan 2010 | 11 Mar 2016 | British | 62 years |
| Stephanie Frances Ball | Director | 16 Dec 2020 | 31 Dec 2021 | British | 45 years |
| Stephen Howard Rhodes Musgrave | Director | 31 Dec 1998 | 30 Jun 2006 | British | 73 years |
| Ulrike Schwarz-runer | Director | 1 Feb 2011 | 28 Apr 2016 | Austrian | 55 years |
| William Robert Bax | Director | 1 Feb 2011 | 1 Jun 2018 | British | 48 years |
| William Robert Holland | Secretary | 26 Jul 1991 | 9 Aug 1993 | British | - |