| Alan Frank Rahilly | Director | 3 Apr 1991 | 1 Jul 1991 | British | 83 years |
| Andrew Christopher Bolter | Director | 3 Sept 2012 | 17 Apr 2013 | British | 56 years |
| Anthony Fellows | Director | 3 Apr 1991 | 6 Dec 1991 | British | 84 years |
| Antony Lewis John Thomas | Secretary | 3 Apr 1991 | 17 Dec 2001 | British | - |
| Ben Coggan | Director | 15 Jul 2019 | 30 Jun 2023 | British | 48 years |
| Charles Cedric Hollinsworth | Director | 4 Jan 1999 | 22 Nov 2000 | British | 78 years |
| Charles Novotny | Director | 3 Apr 1991 | 14 Jan 1993 | British | 88 years |
| Christopher David Hooker | Director | 3 Apr 1991 | 22 Aug 1998 | British | 74 years |
| David Connal Cather | Director | 22 Nov 2000 | 30 Sept 2006 | British | 67 years |
| Deborah Grimason | Director | 16 Apr 2013 | 20 Nov 2013 | British | 63 years |
| Duncan Leslie Bratt | Director | 24 May 1995 | 25 May 2000 | British | 80 years |
| Elizabeth Mary Bayley | Secretary | 17 Dec 2001 | 1 Dec 2005 | British | - |
| Frank Stuart Chiswell Manson | Director | 3 Apr 1991 | 24 May 1995 | British | 87 years |
| Gary Charles Mcardle | Director | 1 Dec 2004 | 30 Jan 2006 | British | 66 years |
| Gary Nicholas Whitehead | Director | 30 Jan 2006 | 26 Jan 2008 | British | 56 years |
| George William Bolsover | Director | 4 Sept 1996 | 30 Sept 1997 | British | 76 years |
| Gordon John Tuck | Director | 8 Mar 2017 | 30 Jun 2025 | British | 56 years |
| Guy Franklin Young | Director | 1 Feb 2011 | 17 Apr 2013 | South African | 57 years |
| Ian Alan Duncan Peters | Director | 26 Jun 2000 | 1 Dec 2004 | British | 61 years |
| James Alexander Claydon | Director | 1 Nov 2006 | 26 Jan 2008 | British | 66 years |
| James Richard Stirk | Secretary | 26 Jan 2008 | 30 Nov 2012 | British | - |
| Johannes Frederick Van Blerk Serfontein | Director | 30 Sept 2006 | 1 Feb 2011 | South African | 58 years |
| John Ferguson Bowater | Director | 30 Sept 1993 | 4 Sept 1996 | British | 77 years |
| John Richard Bradshaw | Secretary | 30 Nov 2012 | 16 Apr 2013 | British | - |
| John Robert Taylor | Director | 26 Jan 1995 | 30 Sept 1997 | British | 77 years |
| John William Leevers | Director | 3 Apr 1991 | 3 Apr 1993 | Australian | 77 years |
| John William Leevers | Director | 3 Apr 1993 | 9 Jan 1995 | Australian | 77 years |
| Kevin John Seaman | Director | 30 Sept 1997 | 17 Apr 2013 | British | 70 years |
| Malcolm Whittle | Director | 3 Apr 1991 | 31 Jul 1998 | British | 79 years |
| Maria Claire Gent | Director | 1 Mar 2007 | 26 Jan 2008 | British | 55 years |
| Mark Wilson Joel | Director | 4 Nov 2008 | 17 Apr 2013 | British | 63 years |
| Martin Kenneth Riley | Director | 16 Apr 2013 | 8 Mar 2017 | British | 59 years |
| Paul Derek Tunnacliffe | Secretary | 1 Dec 2005 | 10 Dec 2007 | British | - |
| Paul Francis William Cottrell | Director | 16 Apr 2013 | 15 Jul 2019 | British | 60 years |
| Peter Francis Davenport | Director | 14 Jan 1993 | 30 Sept 1993 | British | 89 years |
| Richard Simpson | Director | 30 Mar 2009 | 1 Aug 2011 | British | 54 years |
| Rupert Burne | Director | 26 Jan 2008 | 5 Nov 2008 | British | 63 years |
| Simon Lloyd Willis | Director | 31 Jul 2006 | 30 Mar 2009 | British | 61 years |
| Terence Robert Last | Director | 26 Jan 2008 | 17 Apr 2013 | British | 76 years |
| Thomas Bernard Manning Holcroft | Director | 3 Apr 1991 | 30 Jan 1998 | British | 79 years |
| Todd William Hannigan | Director | 30 Jan 2006 | 1 Nov 2006 | Australian | 54 years |