| Guy William Ingledew Leonard | Director | 27 Nov 2015 | 31 Dec 2020 | British | 71 years |
| Joanna Maria Field | Secretary | 27 Jan 2015 | 31 Mar 2017 | - | - |
| Keith John Howells | Director | 29 Jul 2005 | 30 Jun 2019 | British | 73 years |
| Kevin John Stovell | Director | 29 Jul 2005 | 27 Nov 2015 | British | 74 years |
| Marjorie Eva Lynn | Secretary | 1 Oct 1997 | 27 Jan 2015 | British | - |
| Martin James Grigor | Secretary | 17 Oct 1992 | 1 Dec 1994 | British | - |
| Martin Stevenson Crosbie Frame | Director | 14 May 2002 | 29 Apr 2005 | British | 81 years |
| Michael David Haigh | Director | 30 Jun 2019 | 31 Jul 2022 | British | 66 years |
| Michael Orlando Blackburn | Director | 1 Oct 1997 | 18 Oct 2007 | British | 81 years |
| Peter John Wickens | Director | 29 Jul 2005 | 31 Dec 2010 | British | 76 years |
| Peter Michael Chesworth | Director | 17 Oct 1992 | 1 Oct 1997 | British | 81 years |
| Peter Michael Chesworth | Director | 23 Apr 1999 | 5 Aug 2005 | British | 81 years |
| Philip Charles Gregory | Secretary | 15 Mar 1996 | 1 Oct 1997 | British | - |
| Robert Beresford | Director | 17 Oct 1992 | 1 Oct 1997 | British | 88 years |
| Robin Bretten Fox | Director | 17 Oct 1992 | 10 May 2002 | British | 83 years |
| Timothy John Thirlwall | Director | 1 Dec 1994 | 26 Apr 1999 | British | 83 years |
| William Gregor Desson | Secretary | 1 Dec 1994 | 15 Mar 1996 | British | - |