| Alain Gerard Edmond Bourguignon | Director | 1 Apr 2010 | 31 Mar 2014 | French | 67 years |
| Angela Betty Yeoman | Director | 27 Jul 1992 | 31 Dec 2012 | British | 95 years |
| Barnabus Towne Beddow | Director | 1 Mar 1999 | 30 Mar 2007 | British | 77 years |
| Clive Alan Halton | Director | 1 Jun 1995 | 2 Aug 2002 | British | 87 years |
| David Cameron Macdonald | Director | 28 May 1993 | 31 May 1995 | British | 90 years |
| David Foster Yeoman | Director | 27 Jul 1992 | 8 Sept 2006 | British | 68 years |
| David Foster Yeoman | Secretary | 27 Jul 1992 | 7 Mar 1994 | British | - |
| David John Marsh | Director | 1 May 2004 | 9 Feb 2007 | British | 82 years |
| David John Marsh | Secretary | 7 Mar 1994 | 9 Feb 2007 | British | - |
| David Peter Smith | Director | 12 Apr 1996 | 30 Jun 2005 | British | 73 years |
| David Tidmarsh | Director | 27 Jul 1992 | 29 Apr 1994 | British | 81 years |
| David Tidmarsh | Director | 1 Aug 2004 | 26 Jun 2006 | British | 81 years |
| Edward Cresswell Saunders | Director | 27 Jul 1992 | 31 Dec 1995 | British | 102 years |
| Eric Charles George Duffey | Director | 27 Jul 1992 | 31 Aug 2006 | British | 80 years |
| Francois Petry | Director | 1 Dec 2015 | 31 Dec 2018 | French | 60 years |
| George William Bolsover | Director | 7 Sept 2006 | 31 Mar 2010 | British | 76 years |
| Guy Charles Edwards | Director | 17 Jan 2014 | 31 Mar 2014 | British | 61 years |
| Guy Charles Edwards | Director | 1 Jan 2019 | 21 May 2021 | British | 61 years |
| James Keith Retallack | Director | 7 Sept 2006 | 30 Jun 2011 | British | 69 years |
| James West Atherton-ham | Director | 1 Jul 2011 | 30 Apr 2019 | British | 56 years |
| John Ferguson Bowater | Director | 7 Sept 2006 | 31 Dec 2022 | British | 77 years |
| John Foster Yeoman | Director | 27 Jul 1992 | 8 Sept 2006 | British | 65 years |
| John Gerard Wernicke Smart | Director | 27 Jul 1992 | 1 Sept 2000 | British | 81 years |
| John Luff | Director | 27 Jul 1992 | 28 Mar 1993 | British | 103 years |
| Kurt Matthew Larson | Director | 27 Jul 1992 | 9 Feb 2007 | United States | 68 years |
| Mary Ford | Secretary | 2 Jan 2007 | 30 Mar 2012 | British | - |
| Nicholas Lander | Director | 1 Apr 2014 | 26 Jun 2015 | British | 48 years |
| Patrick Robert Ward | Director | 1 Apr 2014 | 30 Nov 2015 | British | 66 years |
| Richard Martin Painter | Director | 27 Jul 1992 | 9 Feb 2007 | British | 68 years |
| Robert Simon Peter Taylor | Director | 27 Jul 1992 | 22 Sept 2006 | British | 88 years |
| Rory Stuart Graham | Director | 10 Dec 1997 | 9 Feb 2007 | British | 74 years |
| Ross William Snape | Director | 12 Sept 2005 | 29 Sept 2006 | British | 62 years |