| Adrian David Nickols | Director | 1 Mar 2002 | 31 May 2005 | British | 66 years |
| Angela Hoffman | Director | 25 Feb 2004 | 23 Jun 2006 | American | 61 years |
| Anthony Edward Collins | Director | 21 Dec 2007 | 16 Dec 2010 | British | 70 years |
| Antony David Kingsley Kell | Director | 26 Feb 1997 | 30 Apr 1999 | British | 87 years |
| Bruce Alan Ainsworth | Director | 11 Aug 2005 | 21 Jun 2013 | American | 75 years |
| Christine Anne Daly | Secretary | 21 Dec 2007 | 23 Jul 2014 | British | - |
| Christopher Dane Walters | Director | 26 Feb 1997 | 5 May 2000 | British | 81 years |
| Christopher Gordon Stanley Robey | Secretary | 1 May 1998 | 12 Jan 2006 | British | - |
| Christopher William Timpson Scott | Director | 1 Sept 2003 | 31 Aug 2005 | British | 64 years |
| Christopher William Timpson Scott | Director | 18 May 2011 | 4 Nov 2022 | British | 64 years |
| Cindy Lynn Wallis-lage | Director | 23 Mar 2012 | 15 Jan 2021 | American | 64 years |
| Clifford A Johnson Iii | Director | 12 Jan 2006 | 21 Dec 2007 | American | 81 years |
| Clifford A Johnson Iii | Secretary | 12 Jan 2006 | 21 Dec 2007 | American | - |
| Colin John Appleyard | Director | 26 Feb 1997 | 31 Dec 1997 | British | 84 years |
| Daniel William Mccarthy | Director | 1 Dec 2005 | 8 Dec 2011 | American | 73 years |
| David Henderson Cowie | Director | 26 Feb 1997 | 28 Jun 2000 | British | 88 years |
| David Scott Macdonald Aitken | Director | 9 Apr 2014 | 15 Jan 2021 | British | 60 years |
| Donald Richard Stevens | Director | 21 Jun 2013 | 17 Jan 2014 | American | 62 years |
| Edward David Burgess | Director | 26 Feb 1997 | 31 Aug 2005 | British | 85 years |
| Edward Walsh | Director | 12 Nov 2010 | 16 Apr 2014 | United States | 75 years |
| Emma Kathryn Wrighton | Director | 21 Dec 2007 | 31 Dec 2011 | British | 53 years |
| Francis Declan Finbar Tempany Mccormack | Secretary | 23 Jul 2014 | 14 Nov 2022 | British | - |
| Francis Declan Finbar Tempany Mccormack | Director | 15 Jan 2021 | 14 Nov 2022 | British | 71 years |
| George Christian Hedemann | Secretary | 1 May 1998 | 2 Jun 2008 | American | - |
| Graham Thompson | Director | 26 Feb 1997 | 31 Aug 2005 | British | 75 years |
| Hector Brouwer De Koning | Director | 18 May 2011 | 16 Apr 2014 | British | 72 years |
| Hoe Wai Cheong | Director | 6 May 2010 | 5 Apr 2022 | Malaysian | 70 years |
| Ian Blacker | Director | 14 Nov 2022 | 14 Mar 2024 | British | 59 years |
| Ian Michael Robinson | Director | 9 Jul 2012 | 15 Jan 2021 | British | 61 years |
| James Douglas Doull | Director | 14 Nov 2022 | 24 Jul 2025 | American | 65 years |
| James Douglas Maclellan Currie | Director | 17 Jan 2005 | 17 Jan 2014 | British | 67 years |
| James Stephen Hetherington | Director | 26 Feb 1997 | 30 Apr 1998 | British | 87 years |
| James Wray Hipps | Director | 26 Feb 1997 | 4 Mar 2002 | American | 76 years |
| John Douglas Hutcheon | Director | 5 Jul 1991 | 29 Feb 1996 | British | 85 years |
| John Douglas Hutcheon | Secretary | 5 Jul 1991 | 29 Feb 1996 | British | - |
| John Francis Grimes | Director | 26 Feb 1997 | 30 Apr 2005 | British | 83 years |
| Kerry Bryant Erington | Director | 18 May 2011 | 16 Apr 2014 | American | 74 years |
| Lawrence Gareth Spencer Hughes | Director | 1 Jan 1998 | 7 Aug 2000 | British | 73 years |
| Mark Andrew Allan | Director | 9 Jul 2012 | 29 Sept 2016 | British | 63 years |
| Martin Douglas Mcmillan | Director | 31 Aug 2001 | 28 Feb 2003 | British | 79 years |
| Nicholas John Dawes | Director | 26 Feb 1997 | 31 Mar 1998 | British | 87 years |
| Nicholas Paine | Director | 5 Jul 1991 | 31 Mar 1997 | British | 92 years |
| Nicholas Townsend | Director | 1 Apr 2003 | 3 Feb 2010 | British | 75 years |
| Peter Ingamells | Director | 11 Oct 2004 | 31 Aug 2005 | British | 73 years |
| Peter John Mason | Director | 1 Dec 1997 | 31 Aug 2005 | British | 79 years |
| Richard William Warren | Director | 26 Feb 1997 | 15 Jan 2005 | British | 80 years |
| Robbie John Reed Gibson | Director | 5 Apr 2022 | 16 May 2025 | British | 43 years |
| Roger Antony Bunn | Director | 26 Feb 1997 | 1 Mar 1999 | British | 85 years |
| Roger Lewis Spolton | Director | 26 Feb 1997 | 4 Mar 2002 | British | 82 years |
| Rosemary Elizabeth Thomas | Director | 7 Aug 2000 | 1 Sept 2004 | British | 63 years |
| Steve Edwards | Director | 12 Nov 2010 | 16 Apr 2014 | American | 70 years |
| Steven Dee Winchester | Director | 26 Feb 1997 | 1 May 1998 | Usa | 70 years |
| Steven Dee Winchester | Secretary | 1 Mar 1996 | 1 May 1998 | Usa | - |
| Stuart Thomas Wharton | Director | 26 Feb 1997 | 31 Mar 2003 | British | 83 years |
| Thomas Reorda | Director | 8 Dec 2011 | 17 Jan 2014 | American | 71 years |
| Timothy Triplett | Secretary | 2 Jun 2008 | 17 Jan 2014 | British | - |
| William Thomson | Director | 26 Feb 1997 | 31 Aug 2005 | British | 75 years |
| Youssef Merjaneh | Director | 14 Nov 2022 | 29 Aug 2025 | German | 49 years |