| Alan Irvine Pickup | Director | 31 Mar 1995 | 20 Sept 2002 | British | 84 years |
| Andrew James Huke | Director | 23 Jul 2007 | 28 Nov 2011 | British | 67 years |
| Arthur Michael Palliser | Director | 26 Jul 1992 | 1 Jul 1993 | British | 104 years |
| Bruce Alan Fletcher | Director | 3 Feb 2011 | 25 Sept 2012 | American | 66 years |
| Catherine Mary Brett | Director | 18 Jul 2014 | 11 Jan 2016 | British | 61 years |
| Catriona Regina Meharry | Director | 14 Mar 2022 | 28 Feb 2025 | British | 49 years |
| Charles Dudley Humphrey Bryant | Director | 26 Jul 1992 | 30 Sept 1992 | British | 78 years |
| Christopher David Spooner | Director | 20 Sept 2002 | 21 Sept 2007 | British | 76 years |
| Christopher Julian Sheridan | Director | 26 Jul 1992 | 1 Jul 1993 | British | 83 years |
| Christopher Peter Davies | Director | 1 Jul 2018 | 14 Mar 2022 | British | 64 years |
| David Jaffa | Director | 17 Dec 2003 | 29 Sept 2006 | British | 71 years |
| David John Clements | Director | 23 Jul 2004 | 28 Nov 2011 | British | 64 years |
| David Michael Watts | Director | 23 Jun 2017 | 1 Jul 2018 | British | 60 years |
| Dennis Michael Smith | Director | 1 Sept 1999 | 31 Aug 2004 | British | 72 years |
| Frances Ann Craig | Director | 6 Dec 2006 | 21 Sept 2007 | British | 66 years |
| Frances Julie Niven | Secretary | 23 Jul 2004 | 19 Jul 2005 | British | - |
| George Ernest Loudon | Director | 26 Jul 1992 | 31 Jul 1992 | Dutch | 84 years |
| Hannah Elizabeth Shepherd | Secretary | 15 Oct 2013 | 4 Jul 2014 | - | - |
| Helen Docherty | Secretary | 26 Jan 2012 | 15 Oct 2013 | - | - |
| Hollie Rheanna Wood | Secretary | 24 Sept 2010 | 26 Jan 2012 | - | - |
| Ian Christopher Cotterill | Director | 26 Jul 1992 | 1 Jul 1993 | British | 78 years |
| Irene Mitchell Dorner | Director | 26 Jul 1992 | 1 Jul 1993 | British | 72 years |
| Irene Mitchell Dorner | Secretary | 26 Jul 1992 | 15 Jul 1993 | British | - |
| Jacques Fleurant | Director | 26 Jul 2019 | 30 Sept 2021 | Canadian | 59 years |
| James Keith Barton | Secretary | 15 Jul 1993 | 27 Jul 1995 | British | - |
| Jane Fahey | Secretary | 22 Sept 2016 | 9 Nov 2017 | - | - |
| John Botley | Director | 11 Oct 1993 | 31 Mar 1995 | British | 73 years |
| Jonathan James Calladine | Director | 25 Sept 2012 | 4 Jul 2014 | British | 60 years |
| Judith Anne Heald | Director | 1 Jan 1997 | 1 Sept 1999 | British | 64 years |
| Lorna Youssouf | Secretary | 8 Nov 2017 | 4 Sept 2018 | - | - |
| Mark Vivian Pearce | Secretary | 19 Dec 2002 | 23 Jul 2004 | British | - |
| Matthew Nathan Gillen | Director | 30 Sept 2021 | 30 Sept 2025 | British | 42 years |
| Nicola Carol Hopkins | Secretary | 25 Sept 2019 | 25 Feb 2022 | - | - |
| Peter John Reid | Director | 3 Feb 2011 | 28 Feb 2021 | British | 64 years |
| Philip Antony Alvey | Director | 28 Nov 2011 | 1 Dec 2020 | British | 52 years |
| Rajiv Kumar Gopaul | Director | 28 Nov 2011 | 26 Jul 2019 | British | 58 years |
| Richard St Leger Gillman | Director | 8 Jul 1994 | 30 Dec 1996 | British | 71 years |
| Richard William Quin | Secretary | 26 Jul 1992 | 26 Jul 1993 | Irish | - |
| Robert Hugh Musgrove | Secretary | 6 Aug 1999 | 19 Dec 2002 | Other | - |
| Robert Hugh Musgrove | Secretary | 19 Jul 2005 | 24 Sept 2010 | British | - |
| Romana Lewis | Secretary | 4 Sept 2018 | 25 Sept 2019 | - | - |
| Shaun Kevin Bryant | Secretary | 1 Oct 1995 | 6 Aug 1999 | British | - |
| Simon Christopher Penney | Director | 1 Jul 1993 | 8 Jul 1994 | British | 78 years |
| Syeeda Siddiqui | Secretary | 4 Jul 2014 | 22 Sept 2016 | - | - |
| Terence John Day | Director | 1 Jul 1993 | 17 Dec 2003 | British | 78 years |
| Vanessa Indira Garnham | Secretary | 27 Jul 1995 | 1 Oct 1995 | British | - |