| Alan Paul Busson | Secretary | 20 Apr 2006 | 29 Sept 2006 | British | - |
| Alexander Park Leitch | Director | 9 Aug 1991 | 10 Dec 1991 | British | 79 years |
| Andrew James Thompson | Director | 21 Aug 2006 | 31 Dec 2006 | British | 68 years |
| Angela Gibson | Director | 16 Jun 2014 | 11 Jun 2015 | United Kingdom | 59 years |
| Anne Torry | Director | 2 Feb 2007 | 15 Feb 2011 | British | 61 years |
| Barry John Perkins | Director | 16 Jun 2014 | 31 Dec 2015 | United Kingdom | 60 years |
| Brian Michael Thomas | Director | 28 Nov 1996 | 3 Aug 1998 | British | 74 years |
| Claudio Gienal | Director | 15 Feb 2011 | 31 Dec 2013 | Swiss | 52 years |
| David Charles George Nichols | Director | 21 Jan 2016 | 7 Sept 2017 | British | 53 years |
| David John Etherington | Director | 11 Nov 2005 | 31 Aug 2012 | British | 69 years |
| David Perrott Sims | Director | 7 Nov 1997 | 21 Aug 2006 | British | 68 years |
| David Ross Carrie | Director | 7 Nov 1997 | 11 Nov 2005 | United Kingdom | 62 years |
| Gary Paul John Shaughnessy | Director | 4 Dec 2014 | 1 Jan 2016 | British | 60 years |
| Gavin Russell Cameron Munnoch | Director | 29 Jun 2009 | 1 Oct 2009 | British | 74 years |
| Georgina Farrell | Director | 12 Jun 2015 | 18 Dec 2017 | Irish | 50 years |
| Georgina Kaye Fleet | Director | 12 Mar 2024 | 17 Jun 2025 | British | 51 years |
| Helen Alison Pickford | Director | 1 Apr 2016 | 1 Apr 2016 | British | 55 years |
| Helen Alison Pickford | Director | 1 Apr 2016 | 19 Feb 2020 | British | 55 years |
| Isla Rebecca Hale | Secretary | 6 Sept 2004 | 24 May 2005 | British | - |
| James Barrington Quin | Director | 13 Sept 2016 | 31 Aug 2018 | British | 57 years |
| James Richard Sykes | Director | 7 Dec 2012 | 31 Dec 2019 | British | 65 years |
| John Herbert Keppel | Director | 7 Sept 2017 | 31 Jan 2025 | New Zealander | 56 years |
| John Peter Gurney | Director | 9 Aug 1991 | 19 Dec 1995 | British | 90 years |
| Keith John Davies | Director | 10 Dec 1991 | 27 Nov 1997 | British | 79 years |
| Kenneth William Ballard Inglis | Director | 10 Dec 1991 | 29 Apr 1994 | British | 83 years |
| Neil Andrew Freshwater | Director | 17 Feb 2015 | 8 Sept 2016 | British | 57 years |
| Neil James Evans | Director | 28 Nov 1996 | 27 Nov 1997 | British | 69 years |
| Neil James Evans | Director | 5 Oct 2007 | 31 Mar 2016 | British | 69 years |
| Nigel Lowe | Secretary | 24 May 2005 | 20 Apr 2006 | British | - |
| Nigel Lowe | Secretary | 29 Sept 2006 | 30 Jun 2013 | British | - |
| Penelope Jane James | Director | 21 Aug 2006 | 31 Mar 2007 | British | 57 years |
| Peter Charles Campbell | Director | 7 Nov 1997 | 31 Jul 2014 | British | 68 years |
| Peter Charles Howe | Secretary | 9 Aug 1991 | 6 Sept 2004 | British | - |
| Peter John Steer | Director | 21 Aug 2006 | 31 Dec 2013 | British | 73 years |
| Phil Andrew Hodkinson | Director | 7 Nov 1997 | 22 Nov 2000 | British | 68 years |
| Philip John Lampshire | Secretary | 30 Jun 2013 | 12 Jun 2015 | British | - |
| Philip Smith | Director | 10 Dec 1991 | 28 Nov 1996 | British | 79 years |
| Philip Wood | Director | 12 Sept 2012 | 23 Jul 2014 | British | 69 years |
| Rolf Gerhard Niemann | Director | 29 Jun 2009 | 29 Feb 2012 | German | 78 years |
| Ronan Cremin | Director | 19 Feb 2020 | 12 Dec 2022 | Irish | 53 years |
| Shayne Paul Deighton | Director | 3 Aug 1998 | 20 Dec 2000 | British | 67 years |
| Siv Anita Fernqvist | Director | 15 Dec 2022 | 15 Jul 2025 | Swedish | 47 years |
| Stephen Howard Smith | Director | 19 Dec 1995 | 28 Nov 1996 | British | 75 years |
| Stephen Lewis | Director | 30 Oct 2009 | 26 Jun 2014 | British | 58 years |
| Tracey Denise Anderson | Director | 23 Jun 2021 | 1 Dec 2023 | British | 51 years |
| Vincent John Jerrard | Director | 7 Nov 1997 | 22 Jul 2003 | British | 71 years |