| Andrew Rolland Cunningham | Director | 20 May 1997 | 31 Dec 2015 | British | 70 years |
| Geoffrey Joseph Davis | Director | 9 Jul 1993 | 18 Jan 2005 | British | 69 years |
| Geoffrey Joseph Davis | Secretary | 31 May 1995 | 1 Oct 2003 | British | - |
| Helen Christine Gordon | Director | 31 Dec 2015 | 19 Jun 2023 | British | 67 years |
| Ian Joicey Dickinson | Director | 1 Mar 1992 | 24 Feb 1994 | British | 105 years |
| Marie Louise Glanville | Secretary | 1 Oct 2003 | 18 Dec 2008 | English | - |
| Mark Greenwood | Director | 7 Dec 2010 | 22 Dec 2015 | British | 67 years |
| Michael Patrick Windle | Secretary | 18 Dec 2008 | 4 Mar 2016 | British | - |
| Michael Patrick Windle | Director | 29 Jun 2008 | 22 Jan 2009 | British | 72 years |
| Nicholas Mark Fletcher Jopling | Director | 7 Dec 2010 | 20 Dec 2017 | British | 65 years |
| Nicholas Peter On | Director | 23 Jan 2009 | 30 Sept 2016 | British | 63 years |
| Peter Michael Milburn | Director | 24 Feb 1994 | 29 Sept 1999 | British | 87 years |
| Peter Michael Milburn | Secretary | 1 Mar 1992 | 31 May 1995 | British | - |
| Peter Quentin Patrick Couch | Director | 7 Dec 2010 | 31 Jan 2014 | British | 68 years |
| Robert Henry Dickinson | Director | 1 Mar 1992 | 5 May 2004 | British | 92 years |
| Robert Jan Hudson | Director | 25 Mar 2022 | 19 Jun 2023 | British | 53 years |
| Rupert Jerome Dickinson | Director | 5 May 2004 | 20 Oct 2009 | British | 67 years |
| Sean Anthony Slade | Director | 5 May 2004 | 12 Nov 2004 | British | 62 years |
| Stephen Dickinson | Director | 1 Mar 1992 | 5 May 2004 | British | 92 years |
| Vanessa Kate Simms | Director | 11 Feb 2016 | 26 Apr 2021 | British | 51 years |