| David John Leeder | Director | 30 Jun 1995 | 30 Sept 2009 | British | 69 years |
| David John Leeder | Secretary | 30 Jun 1995 | 10 May 2000 | British | - |
| David Keith Tipping | Director | 10 May 2000 | 7 Feb 2006 | British | 77 years |
| David Keith Tipping | Secretary | 10 May 2000 | 10 Apr 2012 | British | - |
| Elizabeth Barbara Cheney | Secretary | 24 Apr 2017 | 31 Dec 2017 | - | - |
| James Richard Stansfeld Bryant | Director | 29 Mar 1991 | 30 Jun 1995 | British | 84 years |
| James Richard Stansfeld Bryant | Secretary | 29 Mar 1991 | 30 Jun 1995 | British | - |
| James Thomas Holliday | Director | 15 Mar 2016 | 31 Dec 2017 | British | 70 years |
| Jeremy Philip Hilton Vickers | Secretary | 19 Jun 2014 | 24 Jul 2015 | - | - |
| Jeremy Philip Hilton Vickers | Director | 23 May 2014 | 24 Jul 2015 | British | 68 years |
| Jeremy Simon Gee | Director | 15 Mar 2017 | 17 Sept 2018 | British | 58 years |
| Martin John Sidders | Director | 7 Apr 2009 | 19 Jun 2014 | British | 67 years |
| Martin John Sidders | Secretary | 11 Apr 2012 | 19 Jun 2014 | - | - |
| Martin Richard Smith | Director | 22 Mar 2010 | 31 Dec 2020 | British | 70 years |
| Michael Blakey | Director | 24 Jul 2015 | 30 Jun 2020 | British | 62 years |
| Michael Raymond Walker | Director | 15 Mar 2016 | 30 Apr 2021 | British | 67 years |
| Nicholas Martin Dulcken | Director | 10 Jan 2014 | 31 Dec 2019 | British | 58 years |
| Paul William Edmondson | Director | 30 Jun 1995 | 30 Sept 2009 | British | 73 years |
| Richard Henry Westcott | Director | 10 May 2000 | 31 Jan 2004 | British | 78 years |
| Richard James Paterson | Director | 15 Mar 2016 | 31 Mar 2020 | British | 68 years |
| Richard Stanley Clough | Director | 29 Mar 1991 | 30 Jun 1995 | British | 79 years |
| Stephen Charles Casey | Director | 10 May 2000 | 31 Mar 2010 | British | 76 years |
| Stephen Conrad Potter | Director | 21 Apr 2005 | 31 Dec 2009 | British | 79 years |
| Susan Gaynor Hide | Secretary | 24 Jul 2015 | 24 Apr 2017 | - | - |