| Amanda Jane Harrison | Director | 1 Jun 1998 | 1 Dec 1999 | British | 58 years |
| Andrew Frederick Hugh Strawson | Director | 1 Aug 2000 | 6 Dec 2001 | British | 72 years |
| Andrew Steven Chubb | Director | 1 Jul 2005 | 1 Jun 2009 | British | 68 years |
| Anthea Hampson | Director | 1 May 2012 | 31 Dec 2013 | British | 60 years |
| Anthony Frederick Williams | Secretary | 1 Nov 1992 | 30 Sept 2003 | British | - |
| Antonio Manuel Patricio Comprido | Director | 1 Dec 1997 | 30 Jun 1999 | Portuguesie | 80 years |
| Clive Russell Hopkins | Director | 10 May 1992 | 20 Sept 1996 | British | 79 years |
| Colin George Harvey | Director | 10 May 1992 | 16 Oct 1994 | British | 80 years |
| Cornelia Egbeazien Philippa Dibua | Director | 15 Apr 2011 | 1 Aug 2015 | British | 46 years |
| Craig Peter Mcgrath | Director | 26 Jan 2004 | 3 Jul 2008 | Australian | 66 years |
| David Beer | Director | 17 Oct 1994 | 12 Jul 1996 | British | 82 years |
| Derek Wade Watling | Director | 23 Jun 1995 | 1 Mar 1999 | British | 74 years |
| Elizabeth Violetta Rayner | Director | 24 Jun 1993 | 10 Dec 1998 | British | 79 years |
| Emmanuelle Tucci | Director | 1 Aug 2015 | 31 Jul 2019 | French | 43 years |
| Francis Dobbyn | Director | 1 Nov 1998 | 31 Jul 2000 | British | 78 years |
| Graeme Vickers Alexander | Director | 1 Jan 2004 | 30 Jun 2005 | British | 59 years |
| Harold Clive Mather | Director | 10 May 1992 | 23 Jun 1993 | British | 79 years |
| Jeremy Mark Alhadeff | Director | 1 Apr 1993 | 1 Jul 1996 | British | 87 years |
| Jeroen Pieter Johannes Dubois | Director | 1 Aug 2007 | 15 Apr 2011 | Dutch | 49 years |
| John David Williams | Director | 3 Aug 1992 | 22 Jun 1995 | British | 73 years |
| John Malcolm Travers Greensmith | Director | 10 May 1992 | 31 Dec 1992 | British,south African | 77 years |
| John Peter Moulton | Director | 13 Mar 1998 | 1 Sept 1999 | British | 69 years |
| John Porter Adams | Secretary | 10 May 1992 | 31 Oct 1992 | British | - |
| John Stewart Mills | Director | 19 Aug 1996 | 13 Mar 1998 | British | 73 years |
| Laurent Francois Marie Renard | Director | 23 Sept 1996 | 1 Dec 1997 | French | 73 years |
| Luc Anguille | Director | 18 Feb 2014 | 1 Aug 2015 | French | 56 years |
| Michael George Baker | Director | 23 Feb 1993 | 1 Dec 1997 | British | 80 years |
| Michael Robert Davies | Director | 1 Jul 1996 | 31 Dec 2003 | British | 72 years |
| Neil Emmett | Director | 31 Aug 2009 | 1 Oct 2019 | British | 56 years |
| Nigel John Wardle | Director | 1 Aug 2008 | 31 Aug 2009 | British | 73 years |
| Oliver Jean Domonique Peyrin | Director | 1 Sept 1999 | 17 Jun 2002 | French | 68 years |
| Owen Mansel Davies | Director | 10 May 1992 | 1 Jun 1992 | British | 92 years |
| Paul Geoffrey Terry | Director | 1 Jul 2004 | 31 Jul 2008 | British | 67 years |
| Paul Jerzy Dubenski | Director | 19 May 2009 | 30 Jun 2021 | British | 63 years |
| Peter Alderman | Director | 10 Jun 2019 | 9 Dec 2020 | British | 60 years |
| Peter George Allen | Director | 1 Sept 1999 | 31 Jul 2000 | British | 76 years |
| Peter Malcolm Davis | Director | 1 Apr 2000 | 31 Aug 2021 | British | 65 years |
| Ralph Marie Joseph Jeanette Wetzels | Director | 16 Dec 2003 | 31 Jul 2007 | Dutch | 54 years |
| Robert Paul Buky | Director | 1 Aug 2003 | 30 Jun 2004 | British | 57 years |
| Roger William Brown | Director | 1 Jan 2002 | 31 Jul 2003 | British | 64 years |
| Simon James Frank Lang | Director | 1 Nov 2000 | 1 Jan 2002 | British | 71 years |
| Stephen Brown | Director | 1 Aug 2015 | 14 Nov 2023 | British | 57 years |
| Sydney George Horsfield | Director | 1 Mar 1999 | 1 Nov 2000 | Us Citizen | 83 years |
| Tanya Kabalin | Director | 1 Jan 2011 | 1 May 2012 | British | 51 years |
| Terence Michael Lazenby | Director | 10 May 1992 | 1 Jun 1998 | British | 84 years |
| Thomas Willi Fack | Director | 4 Jul 2008 | 31 Dec 2010 | German | 63 years |
| Tron Bernt Endresen | Director | 1 Dec 1997 | 1 Nov 1998 | Norwiegen | 80 years |
| Ursula Ramesh Thakkar | Director | 18 Jun 2002 | 31 Dec 2003 | Indian | 59 years |
| Wayne Geoffrey Murcar | Director | 10 May 1992 | 2 Jan 1993 | Canadian | 79 years |
| Yong Shen | Director | 6 Dec 2001 | 15 Dec 2003 | Chinese | 54 years |