| Andrew David Smith | Director | 18 Jul 2012 | 14 Feb 2014 | British | 50 years |
| Andrew Marc Jones | Director | 28 Jul 2005 | 6 Nov 2009 | British | 58 years |
| Benjamin Toby Grose | Director | 13 Oct 2009 | 13 May 2021 | British | 57 years |
| Catherine Fiona Sayers | Director | 17 Nov 2023 | 30 Nov 2023 | British | 35 years |
| Charles John Middleton | Director | 13 Jul 2016 | 31 Mar 2022 | British | 60 years |
| Christopher Stephen Wates | Director | 17 May 1991 | 2 May 2000 | British | 87 years |
| David Tyrrell Young | Director | 4 May 1994 | 5 Jan 2001 | British | 88 years |
| Eugene Francis Doyle | Director | 5 Jan 2001 | 13 Aug 2007 | Irish | 69 years |
| Humphrey James Montgomery Price | Director | 5 Jan 2001 | 28 Jul 2005 | British | 84 years |
| James Dundas Hamilton | Director | 17 May 1991 | 4 May 1994 | British | 107 years |
| John Dering Nettleton | Director | 17 May 1991 | 5 Jan 2001 | English | 82 years |
| Jonathan Paul Asquith | Director | 13 Jul 1998 | 5 Jan 2001 | British | 70 years |
| Mark Andrew Stirling | Director | 28 Jul 2005 | 6 Nov 2009 | British | 63 years |
| Martin Francis Mcgann | Director | 26 Feb 2003 | 7 Oct 2005 | British | 65 years |
| Michael Anthony Wilson | Secretary | 17 May 1991 | 10 Apr 2001 | British | - |
| Patrick Lionel Vaughan | Director | 5 Jan 2001 | 3 Mar 2001 | British | 79 years |
| Paul Christopher Ronald Wates | Director | 17 May 1991 | 5 Jan 2001 | British | 88 years |
| Philip Graham Rogerson | Director | 13 Jul 1998 | 5 Jan 2001 | British | 81 years |
| Philip John Martin | Director | 13 Oct 2009 | 31 Oct 2016 | British | 69 years |
| Philip John Martin | Secretary | 10 Apr 2001 | 31 Oct 2016 | British | - |
| Richard William Heley | Director | 10 May 1995 | 13 May 1998 | British | 78 years |
| Rodney Clutton | Director | 17 May 1991 | 5 Jan 2001 | British | 80 years |
| Valentine Tristram Beresford | Director | 28 Jul 2005 | 6 Nov 2009 | British | 61 years |
| Virginia Warr | Director | 18 Mar 2022 | 18 Apr 2025 | British | 62 years |