| Anna Jane Husband | Director | 20 Jan 2021 | 26 Jul 2022 | British | 54 years |
| Carl Peter Forster | Director | 13 Dec 1999 | 16 Mar 2000 | German | 71 years |
| Charles Gilbert Vacy-ash | Director | 7 Apr 2005 | 9 Sept 2016 | British | 79 years |
| Christian John Von Freyend | Director | 13 Dec 1999 | 12 Jul 2000 | German | 81 years |
| Christian Wilhelm Eich | Director | 13 Dec 1999 | 12 Jul 2000 | German | 82 years |
| Christopher Jeens | Director | 9 Mar 2007 | 10 Aug 2015 | British | 71 years |
| Christopher John Stuart Woodwark | Director | 23 Jul 1992 | 31 Aug 1993 | British | 79 years |
| David George Bower | Director | 19 Sept 1996 | 31 Mar 1999 | British | 77 years |
| David Miles Smith | Director | 12 Jul 2000 | 15 Apr 2015 | British | 64 years |
| David Pender Richards | Director | 12 Dec 2008 | 20 Jul 2016 | British | 73 years |
| Derek Gordon Barnes | Director | 12 Dec 2008 | 1 Apr 2012 | British | 77 years |
| Fiona Pargeter | Director | 26 Mar 2013 | 10 Apr 2019 | British | 56 years |
| Frank Henning Christian Klaas | Director | 27 Sept 2011 | 31 Aug 2012 | German | 67 years |
| Gavin Bryan Green | Director | 6 Dec 2000 | 4 Oct 2002 | Australian | 69 years |
| Graham John Morris | Director | 23 Jul 1992 | 8 Mar 1995 | British | 76 years |
| Harry Anthony Rose | Director | 23 Jul 1992 | 24 Mar 1999 | British | 85 years |
| Jeffrey Colin Coope | Director | 26 Jun 2012 | 21 Mar 2025 | British | 65 years |
| John Kennedy Russell | Director | 23 Jul 1992 | 31 May 1996 | British | 76 years |
| John Michael Pullen | Director | 23 Jul 1992 | 14 Dec 2006 | British | 93 years |
| John Stirling Edwards | Director | 8 Apr 2014 | 30 Jun 2018 | British | 63 years |
| John Towers | Director | 22 Jul 1993 | 31 May 1996 | British | 77 years |
| Julie Susan Tew | Director | 12 Dec 2008 | 22 Apr 2020 | British | 71 years |
| Keith John Benjamin | Director | 10 Apr 2019 | 19 Oct 2023 | British | 69 years |
| Kevin John Timms | Director | 18 Jun 2003 | 24 Apr 2024 | British | 62 years |
| Kingsley James Riding-felce | Director | 12 Jul 2000 | 8 Apr 2014 | British | 70 years |
| Leslie Malcolm Wharton | Director | 23 Jul 1992 | 22 Jul 1993 | British | 96 years |
| Matthew Gordon Robert Taylor | Director | 2 May 2003 | 3 Dec 2013 | British | 65 years |
| Michael Ernest Beasley | Director | 12 Jul 2000 | 12 Oct 2016 | British | 82 years |
| Michael Francis Marecki | Director | 18 Jun 2003 | 7 Apr 2005 | British | 65 years |
| Michael John Bryant | Director | 23 Jul 1992 | 13 Dec 1999 | British | 79 years |
| Naomi Jane Bishop | Director | 9 Mar 2007 | 10 Apr 2019 | British | 65 years |
| Nicholas John Stephenson | Director | 23 Nov 1994 | 13 Dec 1999 | British | 77 years |
| Nicholas John Stephenson | Director | 12 Jul 2000 | 29 Jun 2006 | British | 77 years |
| Nicolas Frank Barter | Director | 12 Jul 2000 | 13 Sept 2016 | British | 85 years |
| Peter Mitchell | Director | 21 Mar 1996 | 29 Sept 2005 | British | 90 years |
| Philip Colin Popham | Director | 29 Jun 2006 | 15 Apr 2015 | British | 60 years |
| Rajul Kunjbihari Shah | Secretary | 19 May 2000 | 20 Sept 2000 | British | - |
| Robert Alan Dover | Director | 12 Jul 2000 | 12 Jul 2017 | British | 80 years |
| Roderick Thomas Wilson Ramsay | Director | 23 Jul 1992 | 13 Dec 1999 | British | 80 years |
| Roger George Putnam | Director | 12 Jul 2000 | 29 Sept 2005 | British | 80 years |
| Royden Axe | Director | 23 Jul 1992 | 14 May 1997 | British | 88 years |
| Sarah Frances Sevier | Director | 11 Apr 2018 | 20 Nov 2024 | British | 58 years |
| Stephen Norman | Director | 22 Jan 2020 | 31 Jan 2021 | French | 71 years |
| Susan Doreen Windridge | Secretary | 23 Jul 1992 | 10 Mar 1994 | British | - |
| Susan Lesley Pearson | Secretary | 20 Sept 2000 | 31 Mar 2019 | Other | - |
| Teresa Margaret Elliott | Secretary | 10 Mar 1994 | 19 May 2000 | British | - |
| Thomas Finlayson Grant Purves | Director | 19 Sept 1996 | 30 Apr 1999 | British | 77 years |
| Werner Samann | Director | 13 Dec 1999 | 1 Jan 2002 | German | 83 years |
| William Craig Allan | Director | 10 Jun 1998 | 12 Oct 2016 | British | 83 years |
| William John Bacchus | Director | 9 May 2000 | 14 Dec 2006 | British | 89 years |