| Andrew Christopher Bolter | Director | 3 Sept 2012 | 4 Apr 2014 | British | 56 years |
| Andrew William Hodges | Director | 21 Dec 2010 | 7 Jan 2013 | British | 59 years |
| Andrew William Hodges | Secretary | 4 Jan 2007 | 27 Jan 2012 | British | - |
| Anthony William Lea | Director | N/A | 16 Oct 1992 | British | 78 years |
| Charles Anthony Wentzel | Secretary | N/A | 29 Feb 2000 | British | - |
| David Bruce Moore | Director | N/A | 7 May 1999 | British | 75 years |
| David Connal Cather | Director | 18 Oct 1999 | 30 Sept 2006 | British | 67 years |
| David Maxwell Weston | Director | 12 Dec 2006 | 18 May 2009 | British | 68 years |
| Fiona Puleston Penhallurick | Director | 4 Apr 2014 | 15 Mar 2016 | British | 59 years |
| Francis Keith John Jackson | Director | 13 May 1999 | 31 Mar 2005 | British | 77 years |
| Geoffrey Allan Wilkinson | Secretary | 29 Feb 2000 | 19 Mar 2007 | British | - |
| Geoffrey Mortimer | Director | N/A | 27 Aug 1993 | British | 82 years |
| Guy Franklin Young | Director | 10 Apr 2012 | 31 Oct 2015 | South African | 57 years |
| Ian Pughsley | Director | 18 Jan 1996 | 10 Mar 1999 | British | 72 years |
| James Richard Stirk | Secretary | 27 Jan 2012 | 30 Nov 2012 | British | - |
| John Draper | Director | N/A | 7 Oct 1998 | British | 85 years |
| John Richard Bradshaw | Secretary | 30 Nov 2012 | 30 Jun 2013 | British | - |
| John Roger Broughton Phillimore | Director | N/A | 16 Oct 1992 | British | 77 years |
| Karim Hajjar | Director | 31 Mar 2005 | 21 Dec 2010 | British | 63 years |
| Michael John Choules | Director | 12 Sept 2014 | 9 Apr 2021 | British | 66 years |
| Richard John Wood | Director | 9 Apr 2021 | 30 Sept 2022 | British | 54 years |
| Robert Sinclair Robertson | Director | 7 Oct 1998 | 12 Dec 2006 | British | 75 years |
| Rupert Burne | Director | 18 May 2009 | 10 Apr 2012 | British | 63 years |
| Timothy Charles Aylmer Wadeson | Director | N/A | 16 Oct 1992 | British | 90 years |