| Alan Brian Wilson | Director | 23 Aug 1991 | 9 Nov 1992 | British | 92 years |
| Annette Marian Doherty | Director | 8 Aug 2003 | 26 Mar 2009 | British/american | 64 years |
| Annette Marian Doherty | Director | 15 Jul 2011 | 31 Jul 2012 | British/american | 64 years |
| Anthony Alister Dunning | Director | 23 Aug 1991 | 30 Apr 1998 | British | 85 years |
| Anthony Martin Whitehead | Director | 3 Apr 1995 | 8 Apr 1999 | British | 70 years |
| Ben Osborn | Director | 5 Nov 2018 | 29 Apr 2022 | British | 48 years |
| Benjamin John Osborn | Director | 26 Oct 2012 | 22 Apr 2015 | British | 48 years |
| Carole Anne Johnson | Director | 12 Feb 2016 | 17 Mar 2017 | British | 55 years |
| Charles Norman Mastin | Director | 23 Aug 1991 | 5 Oct 1993 | Usa | 93 years |
| Clive Paul Aldenhoven | Director | 23 Aug 1991 | 30 Sept 1992 | British | 79 years |
| Colin Malcolm Seller | Director | 1 Aug 2006 | 12 Feb 2016 | British | 62 years |
| Colin Malcolm Seller | Director | 27 Apr 2017 | 23 Sept 2019 | British | 62 years |
| Darius Bruce Hughes | Director | 5 Feb 2014 | 19 Jul 2016 | British | 57 years |
| Darren Noseworthy | Director | 24 Jul 2015 | 9 Jan 2017 | Canadian | 55 years |
| David Gower Bevan | Director | 20 Apr 2009 | 19 Apr 2013 | British | 58 years |
| David Jeremy Horton | Secretary | 23 Aug 1991 | 15 Dec 1995 | British | - |
| David Mcgibney | Director | 20 Dec 1996 | 1 Mar 2001 | British | 72 years |
| David Roblin | Director | 9 Feb 2009 | 9 Aug 2010 | United Kingdom | 59 years |
| David Stuart Reynolds | Director | 22 Apr 2015 | 3 Mar 2016 | British | 52 years |
| Declan Patrick Doogan | Director | 20 Dec 1991 | 17 Mar 1995 | British | 73 years |
| Declan Patrick Doogan | Director | 1 May 2001 | 5 Aug 2003 | British | 73 years |
| Denise Jean Harnett | Director | 26 Apr 2018 | 1 May 2024 | British | 61 years |
| Elizabeth Mary Greenfield | Director | 26 Oct 2012 | 30 Apr 2018 | British | 68 years |
| Eric Bauman | Director | 28 Apr 2005 | 2 Feb 2006 | American | 58 years |
| Ewan John Mcdowall | Director | 4 Jul 2013 | 7 Feb 2014 | United Kingdom | 54 years |
| Francis Anthony Zananiri | Secretary | 15 Dec 1995 | 11 Oct 1996 | British | - |
| Franciscus Johannes Carolus Overtoom | Director | 22 Apr 2004 | 1 Nov 2008 | Dutch | 59 years |
| Geoffrey Mansel Edwards | Director | 1 Jul 1993 | 13 Mar 1997 | British | 79 years |
| George Arthur Marshall | Director | 1 Dec 1993 | 28 Jan 1996 | British | 82 years |
| Greg Duncan | Director | 1 Jul 1997 | 8 Apr 1999 | American | 60 years |
| Hendrikus Hermannus Nordkamp | Director | 25 Feb 2015 | 16 Nov 2020 | Dutch | 56 years |
| Ian Eric Franklin | Director | 1 Nov 2008 | 9 Feb 2021 | British | 60 years |
| Imogen Gill | Director | 5 Mar 2010 | 6 Nov 2012 | Uk | 65 years |
| Ivar Robinson | Director | 7 Feb 2000 | 5 Feb 2002 | Norwegian | 87 years |
| Jacqueline Ann Mount | Secretary | 1 Feb 2012 | 21 Jan 2021 | British | - |
| Jacqueline Ann Mount | Director | 21 Jan 2021 | 31 May 2022 | British | 62 years |
| James Andrew Eaton | Director | 27 Oct 2005 | 15 Jan 2008 | American | 70 years |
| John Clyde Embling | Director | 10 Jan 2008 | 8 Mar 2010 | South African | 64 years |
| John Douglas Young | Director | 7 Feb 2007 | 17 Apr 2009 | British | 61 years |
| John Lissaman | Director | 23 Aug 1991 | 25 Nov 1994 | British | 89 years |
| John Martin Hanley | Director | 5 Mar 2010 | 16 Apr 2013 | British | 66 years |
| John Richard Smith | Director | 1 Feb 2012 | 25 Feb 2015 | British | 65 years |
| Jonathan Charles Emms | Director | 1 Jan 2012 | 31 Jan 2015 | British | 62 years |
| Julian Keith Thompson | Director | 31 Dec 2016 | 21 Feb 2025 | British | 65 years |
| Karolyn Fletcher | Director | 1 May 1998 | 8 Apr 1999 | British | 64 years |
| Karolyn Fletcher | Director | 7 Feb 2000 | 12 Feb 2009 | British | 64 years |
| Kenneth James Moran | Director | 22 Mar 1996 | 31 Dec 1999 | Australian | 79 years |
| Matthew James Sumner | Secretary | 6 Feb 2004 | 13 Jan 2012 | British | - |
| Maurice Ernest Jones | Director | 23 Aug 1991 | 30 Jun 2002 | British | 81 years |
| Michael Christopher Hall | Director | 23 Aug 1991 | 8 Apr 1999 | British | 81 years |
| Michael Fauerbach | Director | 20 Apr 2006 | 28 Feb 2009 | American | 54 years |
| Michael John Wilson | Director | 1 Jul 1993 | 7 Apr 1999 | British | 78 years |
| Olivier Raymond Brandicourt | Director | 30 Apr 2003 | 1 Feb 2007 | French | 69 years |
| Paul Richard Rose | Director | 6 Feb 2019 | 26 Apr 2020 | Australian | 62 years |
| Paula Tully | Director | 7 Feb 2013 | 16 Feb 2017 | British | 56 years |
| Peter Caldini | Director | 25 Feb 2015 | 15 May 2016 | Itlay | 60 years |
| Peter Charles Coe | Director | 3 Apr 1995 | 30 Nov 2001 | British | 78 years |
| Peter Stuart Ringrose | Director | 18 Dec 1992 | 25 Nov 1996 | British | 80 years |
| Richard Charles Browning | Director | 27 Jun 1997 | 8 Apr 1999 | British | 75 years |
| Richard John Crow | Director | 23 Aug 1991 | 22 Oct 1996 | British | 70 years |
| Richard Neville Blackburn | Director | 9 Feb 2009 | 1 Jan 2012 | United Kingdom | 58 years |
| Robert Hugh Thomas | Secretary | 15 Nov 1996 | 6 Feb 2004 | British | - |
| Robert Michael Day | Director | 20 Apr 2009 | 11 Oct 2012 | United Kingdom | 55 years |
| Robert Michael Day | Director | 22 Apr 2015 | 19 Jul 2016 | United Kingdom | 55 years |
| Robert Spencer Packard | Director | 23 Aug 1991 | 31 Dec 1991 | Australian | 99 years |
| Roger Llewellyn Smith | Director | 10 Oct 2019 | 24 Apr 2025 | British | 59 years |
| Roger Stone | Director | 20 May 2002 | 20 Sept 2005 | British | 75 years |
| Ruth Amy Coles | Director | 13 Apr 2011 | 24 Jul 2015 | British | 51 years |
| Ruth Mitchell Mckernan | Director | 17 Sept 2010 | 10 Apr 2015 | British | 67 years |
| Scott Richardson | Director | 9 Feb 2017 | 14 Mar 2018 | American | 60 years |
| Simon Fraser Campbell | Director | 20 Dec 1996 | 30 Sept 1998 | British | 84 years |
| Stella Eccles | Director | 16 Aug 2002 | 31 Jul 2006 | British | 69 years |
| Stephen Richard Wicks | Director | 9 Feb 2009 | 31 Mar 2010 | British | 70 years |
| Steven Michael Poulton | Director | 20 Apr 2009 | 7 Jan 2013 | United Kingdom | 67 years |
| Susan Jean Wallcraft | Director | 9 Feb 2009 | 6 Apr 2011 | United Kingdom | 59 years |
| Susan Pernille Knight | Director | 1 Feb 2012 | 3 May 2012 | British | 60 years |
| Susan Rienow | Director | 23 Mar 2018 | 5 Feb 2019 | American | 46 years |
| Susan Rienow | Director | 28 Feb 2022 | 8 Oct 2024 | American | 46 years |
| Thomas Francis Dolan | Director | 26 Oct 2012 | 31 Dec 2016 | British | 63 years |
| Timo Rolf Juhani Tiivola | Director | 29 Jun 2001 | 20 Dec 2002 | Finnish | 72 years |
| Timothy Bentley | Director | 1 Dec 1994 | 31 May 2001 | British | 82 years |
| Tony George Robert Audley | Director | 1 Dec 1994 | 31 May 2004 | British | 75 years |
| Vaila Mackenzie Marshall | Director | 7 Aug 2002 | 6 Jun 2003 | British | 77 years |
| William Hugh O'connor | Director | 23 Aug 1991 | 22 Mar 1996 | Irish | 81 years |
| William John Wilson | Director | 23 Aug 1991 | 3 Apr 1995 | British | 95 years |