| Adel Bedry Al-saleh | Director | 22 Dec 2011 | 12 Mar 2013 | American | 63 years |
| Adrienne Gault | Director | 21 Jul 2000 | 31 May 2003 | - | 65 years |
| Andrew Robert Craig Ross | Director | 5 Mar 2008 | 2 Dec 2012 | British | 62 years |
| Carol Nunn | Secretary | 25 Apr 2005 | 3 Apr 2006 | - | - |
| Christopher Michael Renwick Stone | Director | 25 Apr 2005 | 22 Dec 2011 | British | 64 years |
| Edouard Pillot | Director | 18 Jan 2013 | 12 Mar 2013 | French | 49 years |
| Edward Gerard Brown | Director | 2 Dec 2012 | 12 Mar 2013 | British | 62 years |
| Edwin John Magowan | Director | 21 Jul 2000 | 13 Dec 2000 | British | 66 years |
| Elizabeth Helen Brownell | Director | 17 Dec 2021 | 31 Mar 2023 | British | 41 years |
| Francesca Anne Todd | Director | 28 May 2021 | 10 Dec 2021 | British | 55 years |
| Gemma Rebecca Bate-williams | Director | 28 Mar 2023 | 19 Aug 2024 | British | 46 years |
| Geoffrey Leslie Neville | Director | 18 Mar 2003 | 25 Apr 2005 | British | 67 years |
| Ian Edward Jarvis | Director | 21 Dec 2016 | 9 Nov 2017 | British | 55 years |
| Ian Thom | Secretary | 25 Sept 1997 | 25 Apr 2005 | - | - |
| James Douglas Turnbull | Director | 5 Mar 2008 | 12 Mar 2013 | British | 65 years |
| John David Richardson | Secretary | 3 Apr 2006 | 12 Mar 2013 | British | - |
| John Robert Stier | Director | 25 Apr 2005 | 12 Mar 2013 | British | 60 years |
| Julian Gerard Powell Phipps | Director | 5 Mar 2008 | 12 Mar 2013 | British | 60 years |
| Liam Stuart Goddard | Director | 12 Jun 2009 | 7 Oct 2010 | British | 44 years |
| Malcolm Keith Fowler | Director | 23 Sept 2002 | 25 Apr 2005 | British | 74 years |
| Mateusz Michal Szeszkowski | Director | 5 Mar 2008 | 18 Jan 2013 | Polish & Canadian | 54 years |
| Michael Charles Tresise | Director | 23 Sept 2002 | 16 Jan 2004 | British | 65 years |
| Nicholas Siegfried Dale | Director | 9 Nov 2017 | 28 May 2021 | British | 56 years |
| Nigel David Wilson | Director | 25 Sept 1997 | 10 Jul 2001 | British | 70 years |
| Norman Campbell Minnis Gregg | Director | 9 Apr 1999 | 12 Nov 2003 | British | 72 years |
| Patrick Francis John O'donnell Bourke | Director | 1 Aug 2001 | 25 Apr 2005 | British | 69 years |
| Patrick Hugh Haren | Director | 1 Aug 2001 | 25 Apr 2005 | British | 76 years |
| Paul Philip Tomlinson | Director | 13 Dec 2000 | 1 Oct 2001 | British | 69 years |
| Peter Edward Hands | Director | 12 Mar 2013 | 30 Apr 2016 | British | 61 years |
| Philip D'abreu | Director | 12 Oct 2010 | 18 Feb 2013 | Canadian | 43 years |
| Richard John Shearer | Director | 12 Mar 2013 | 31 Dec 2016 | British | 62 years |
| Richard Noel Brady | Director | 25 Jan 1999 | 31 Mar 2004 | British | 69 years |
| Robert Bailes | Director | 25 Sept 1997 | 25 Feb 2002 | British | 79 years |
| Robert Mccann | Director | 25 Sept 1997 | 30 Nov 2000 | British | 72 years |
| Steven Henry Creighton | Director | 19 Feb 2002 | 25 Apr 2005 | British | 67 years |
| Timotheus Jacobus Osnabrug | Director | 5 Mar 2008 | 12 Jun 2009 | Dutch | 45 years |
| William James Spencer Floydd | Director | 12 Mar 2013 | 17 Jun 2013 | British | 57 years |