| Alice Read | Secretary | 19 Jul 2005 | 8 May 2006 | British | - |
| Andrew James Huke | Director | 23 Jul 2007 | 28 Nov 2011 | British | 67 years |
| Atulkumar Brijmohan Kabra | Director | 8 Dec 2020 | 30 Sept 2025 | Indian | 52 years |
| Bruce Alan Fletcher | Director | 4 Feb 2011 | 25 Sept 2012 | American | 66 years |
| Catherine Mary Brett | Director | 18 Jul 2014 | 11 Jan 2016 | British | 61 years |
| Christopher David Spooner | Director | 17 Oct 2003 | 21 Sept 2007 | British | 76 years |
| Christopher John Clarke | Director | 1 Dec 2000 | 3 Sept 2003 | British | 71 years |
| David Jaffa | Director | 17 Dec 2003 | 29 Sept 2006 | British | 71 years |
| David John Clements | Director | 17 Oct 2003 | 28 Nov 2011 | British | 64 years |
| David Macbean | Director | 1 Aug 2000 | 5 Nov 2001 | British | 59 years |
| David Michael Watts | Director | 23 Jun 2017 | 4 Sept 2018 | British | 60 years |
| Frances Julie Niven | Director | 3 Sept 2003 | 17 Oct 2003 | British | 56 years |
| Frances Julie Niven | Secretary | 23 Jul 2004 | 19 Jul 2005 | British | - |
| Geoffrey Ian Lander | Director | 22 Aug 1992 | 25 Oct 1993 | British | 75 years |
| Hannah Elizabeth Shepherd | Secretary | 15 Oct 2013 | 4 Jul 2014 | - | - |
| James Keith Barton | Secretary | 25 Oct 1993 | 17 Jul 1995 | British | - |
| John Richard Patrick Breen | Director | 30 Sept 1994 | 5 Dec 1997 | Irish | 84 years |
| Jonathan James Calladine | Director | 25 Sept 2012 | 4 Jul 2014 | British | 60 years |
| Mark Vivian Pearce | Director | 3 Sept 2003 | 17 Oct 2003 | British | 68 years |
| Mark Vivian Pearce | Secretary | 19 Dec 2002 | 23 Jul 2004 | British | - |
| Matthew Nathan Gillen | Director | 30 Sept 2023 | 30 Sept 2025 | British | 42 years |
| Michael David Warburton | Director | 25 Oct 1993 | 1 Mar 1997 | British | 79 years |
| Nicola Carol Hopkins | Secretary | 25 Sept 2019 | 25 Feb 2022 | - | - |
| Nigel Barker | Secretary | 17 Jul 1995 | 11 Oct 1995 | British | - |
| Nigel Peter Waring | Director | 7 Jan 1998 | 3 Sept 2003 | British | 71 years |
| Nigel Robin Griffiths | Director | 28 May 1997 | 30 Dec 1998 | British | 75 years |
| Pauline Louise Mcquillan | Secretary | 8 May 2006 | 24 Sept 2009 | British | - |
| Peter John Reid | Director | 4 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 | 9 Dec 2020 | British | 58 years |
| Richard Gordon Holt | Director | 22 Aug 1992 | 25 Oct 1993 | British | 79 years |
| Richard Gordon Holt | Secretary | 22 Aug 1992 | 25 Oct 1993 | British | - |
| Richard Peter Whitehouse | Director | 9 Feb 1994 | 2 Sept 1996 | British | 75 years |
| Robert Hugh Musgrove | Secretary | 6 Aug 1999 | 19 Dec 2002 | Other | - |
| Roger John Downham | Director | 25 Oct 1993 | 30 Sept 1994 | British | 82 years |
| Romana Lewis | Secretary | 4 Sept 2018 | 25 Sept 2019 | - | - |
| Shaun Kevin Bryant | Secretary | 11 Oct 1995 | 6 Aug 1999 | British | - |
| Syeeda Ollite | Secretary | 4 Jul 2014 | 9 Jul 2018 | - | - |
| Terence John Day | Director | 17 Oct 2003 | 17 Dec 2003 | British | 78 years |
| Timothy George Frederick Eve | Director | 19 Apr 1999 | 3 Aug 2000 | British | 72 years |