| Danielle Elizabeth Stanborough | Secretary | 31 Mar 2017 | 12 Jan 2018 | - | - |
| Diana Zivko | Secretary | 12 Jan 2018 | 31 Jul 2022 | - | - |
| Diana Zivko | Secretary | 16 Jun 2023 | 2 Aug 2024 | - | - |
| Guy William Ingledew Leonard | Director | 29 Nov 2007 | 31 Dec 2020 | British | 71 years |
| Ian Martin Richard Galbraith | Director | 1 Jul 2019 | 30 Sept 2025 | British | 63 years |
| Jeffrey Alan Turnbull | Director | 10 May 1992 | 13 Aug 1994 | British | 92 years |
| Joanna Maria Field | Secretary | 27 Jan 2015 | 31 Mar 2017 | - | - |
| John Charles Anthony Porter | Secretary | 1 Aug 2022 | 15 Jun 2023 | - | - |
| John Frederick Robson | Director | 10 May 1992 | 18 Jun 1992 | British | 94 years |
| Keith John Howells | Director | 16 Dec 2003 | 30 Jun 2019 | British | 73 years |
| Kevin John Stovell | Director | 29 Jul 2005 | 27 Nov 2015 | British | 74 years |
| Kevin Paul Dixon | Director | 29 Nov 2007 | 31 Mar 2016 | British | 73 years |
| Marjorie Eva Lynn | Secretary | 1 Oct 1997 | 27 Jan 2015 | British | - |
| Martin Stevenson Crosbie Frame | Director | 2 Jul 2002 | 29 Apr 2005 | British | 81 years |
| Michael David Haigh | Director | 31 Mar 2015 | 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 | 13 Aug 1994 | 5 Aug 2005 | British | 81 years |
| Philip Charles Gregory | Secretary | 15 Mar 1996 | 1 Oct 1997 | British | - |
| Richard Williams | Director | 29 Nov 2007 | 31 Mar 2015 | British | 71 years |
| Robert Beresford | Director | 10 May 1992 | 20 Nov 1998 | British | 88 years |
| Robin Bretten Fox | Director | 13 Aug 1994 | 10 May 2002 | British | 83 years |
| Robin Bretten Fox | Secretary | 10 May 1992 | 13 Aug 1994 | British | - |
| Timothy John Thirlwall | Director | 10 May 1992 | 4 Dec 2003 | British | 83 years |
| William Gregor Desson | Secretary | 13 Aug 1994 | 15 Mar 1996 | British | - |
