| Alan Drysdale Sneddon | Director | 16 May 1991 | 8 Mar 1997 | British | 94 years |
| Alexander Rudolf Dieter Koslowski | Director | 18 May 2015 | 13 Jul 2016 | German | 55 years |
| Andrew Nicholas Russell | Director | 5 Mar 2010 | 30 Nov 2011 | British | 59 years |
| Andrew Stuart Watson | Director | 9 Feb 2004 | 8 Jul 2005 | British | 64 years |
| Anya Marjorie O'reilly | Director | 31 Jul 2013 | 15 Aug 2014 | British | 52 years |
| Barry Kenneth John Lewis | Director | 1 Jan 2001 | 7 Nov 2002 | British | 80 years |
| Bryan Henry Portman | Director | 21 Oct 2004 | 1 Dec 2005 | British | 78 years |
| Charles Francis Mckeown | Director | 1 Jan 2001 | 6 Feb 2007 | British | 77 years |
| Christopher William Joseph Hirst | Director | 16 May 1991 | 31 Dec 2004 | British | 81 years |
| Clare Louise Gosling | Director | 30 Mar 2012 | 31 Jul 2013 | British | 53 years |
| Craig Neil Shannon | Director | 5 Jan 2005 | 6 Sept 2005 | British | 63 years |
| Craig Neil Shannon | Director | 16 Apr 2007 | 20 Aug 2007 | British | 63 years |
| David Grattan | Director | 4 May 1998 | 21 Oct 2004 | British | 72 years |
| David Stuart Hollas | Director | 16 May 1991 | 7 Nov 2002 | British | 85 years |
| Finian O'boyle | Director | 7 Nov 2002 | 30 Sept 2004 | British | 70 years |
| Gary Warman | Director | 29 Apr 2020 | 31 May 2022 | British | 58 years |
| George Stephan Pater | Director | 16 May 2005 | 16 Apr 2007 | British | 75 years |
| Gordon Wild | Director | 16 May 1991 | 2 May 1998 | British | 88 years |
| Haydn Griffith | Director | 1 Jan 2001 | 7 Nov 2002 | British | 77 years |
| John Franks | Director | 4 May 1999 | 31 Dec 2000 | British | 75 years |
| Jonathan Paul Taylor | Director | 8 Oct 2013 | 9 Feb 2015 | British | 60 years |
| Katherine Elizabeth Eldridge | Secretary | 13 Jan 2006 | 19 Jul 2010 | British | - |
| Mark Andrew Summerfield | Director | 9 Feb 2006 | 31 Jul 2013 | British | 65 years |
| Martin Gerald Clarke | Director | 1 Jan 2001 | 16 Dec 2005 | British | 70 years |
| Martin Pierce Lewis | Director | 31 Jul 2013 | 31 Dec 2022 | British | 63 years |
| Martyn Christopher Bennett | Director | 30 Mar 1998 | 11 Jul 2003 | British | 80 years |
| Michael Brian Horswell | Director | 16 May 1991 | 27 Mar 1999 | British | 87 years |
| Michael David Fairbairn | Director | 1 Jan 2001 | 26 Jun 2012 | British | 74 years |
| Noel Anthony Freeley | Director | 5 Jul 2016 | 29 Apr 2020 | British | 52 years |
| Nora Agnes O'mahony | Director | 20 Nov 2019 | 31 Jul 2021 | Irish | 59 years |
| Patricia Anne Wade | Secretary | 19 Jul 2010 | 31 Jul 2013 | - | - |
| Patricia Anne Wade | Secretary | 7 Nov 2002 | 13 Jan 2006 | British | - |
| Paul Bowker | Director | 1 Jan 2023 | 1 Apr 2024 | British | 45 years |
| Paul Sharman | Director | 24 Mar 2005 | 30 Jul 2010 | British | 74 years |
| Peter Douglas Johnson | Director | 16 May 1991 | 15 Apr 1994 | British | 97 years |
| Phillip Beamish | Director | 31 Jul 2013 | 1 Apr 2024 | British | 51 years |
| Rakesh Kumar | Director | 1 Apr 2024 | 6 Oct 2025 | British | 46 years |
| Richard Thomas Goddard | Director | 8 Mar 2007 | 8 Oct 2009 | British | 69 years |
| Robert Gordon Taylor | Secretary | 16 May 1991 | 7 Nov 2002 | British | - |
| Rodney James Burgess | Director | 7 May 1999 | 31 Dec 2000 | British | 83 years |
| Rodney Jensen Bulmer | Director | 18 Sept 2009 | 31 Jul 2013 | British | 56 years |
| Shingirai Thaddeus Nyahasha | Director | 5 Dec 2014 | 22 Jul 2016 | British | 52 years |
| Stephen Fitzmaurice Wood | Director | 16 May 1991 | 6 Mar 1999 | British | 88 years |
| Timothy Stephen Bunch | Director | 31 Oct 1994 | 11 Apr 2008 | British | 73 years |
| William Frederick Webb | Director | 18 Apr 1994 | 28 Mar 1998 | British | 89 years |