| Andrew John Bowman | Director | 1 Dec 2014 | 22 Jan 2016 | British | 54 years |
| Andrew John Bowman | Director | 7 Dec 2021 | 21 Jun 2022 | British | 54 years |
| Ann Hird | Director | 23 Apr 2012 | 15 Nov 2012 | British | 69 years |
| Anthony Nicholas Greatorex | Director | 3 Feb 2014 | 1 Dec 2014 | British | 58 years |
| Antony Vincent Holt | Director | 18 Dec 2008 | 23 Apr 2012 | British | 67 years |
| Charles Anthony Earnshaw | Director | 12 Oct 1991 | 25 Sept 1998 | British | 73 years |
| David Nicolas Garbourne Mason | Director | 12 Oct 1991 | 27 Dec 1995 | British | 83 years |
| David William Crawford | Director | 30 Aug 2013 | 6 Dec 2013 | British | 56 years |
| Francesca Anne Todd | Director | 5 Mar 2018 | 10 Dec 2021 | British | 55 years |
| Graham Robert Melrose | Director | 9 Aug 1996 | 31 Dec 1996 | British | 69 years |
| Graham Robert Melrose | Director | 28 Nov 2007 | 10 Nov 2009 | British | 69 years |
| Jeremy Peter Small | Secretary | 22 Dec 2008 | 23 Apr 2012 | British | - |
| John Christopher Joseph Eaton | Secretary | 12 Oct 1991 | 10 Feb 1996 | British | - |
| Michael John Burgess | Director | 11 Jan 1996 | 31 Dec 1996 | British | 79 years |
| Michael John Burgess | Director | 25 Sept 1998 | 17 Nov 2009 | British | 79 years |
| Nicholas Edward Latner | Director | 10 Feb 2017 | 5 Mar 2018 | British | 48 years |
| Nicholas Mckenzie Herbert Burns | Director | 23 Apr 2012 | 12 Aug 2014 | British | 59 years |
| Nicolas Norman Bedford | Director | 23 Apr 2012 | 4 May 2012 | British | 67 years |
| Paul Bradley | Director | 31 Dec 1996 | 11 Dec 2007 | British | 79 years |
| Peter Gray | Director | 31 Mar 2000 | 31 Mar 2010 | British | 80 years |
| Philip John Anderson | Director | 18 Dec 2008 | 23 Apr 2012 | British | 62 years |
| Simon Edward Hall | Director | 22 Jan 2016 | 10 Feb 2017 | British | 51 years |
| Simon Lawrence Vernon Cole | Secretary | 10 Feb 1996 | 22 Dec 2008 | British | - |
| Stephen Charles Carrodus | Director | 12 Oct 1991 | 16 Nov 2009 | Uk | 74 years |
| Stephen Sharp | Director | 23 Apr 2012 | 3 Feb 2014 | British | 61 years |
| Susan Lesley Ring | Director | 12 Aug 2014 | 5 Mar 2018 | British | 65 years |