| Alain Gerard Edmond Bourguignon | Director | 1 Apr 2010 | 1 Mar 2011 | French | 67 years |
| Barnabus Towne Beddow | Director | 1 Nov 1999 | 30 Mar 2007 | British | 77 years |
| Barnabus Towne Beddow | Secretary | 1 Nov 1999 | 12 Feb 2007 | British | - |
| David Tidmarsh | Director | 27 Sept 1991 | 29 Apr 1994 | British | 81 years |
| George William Bolsover | Director | 29 Sept 2006 | 31 Mar 2010 | British | 76 years |
| James Keith Retallack | Director | 1 Mar 2011 | 30 Jun 2011 | British | 69 years |
| James West Atherton-ham | Director | 1 Jul 2011 | 30 Apr 2019 | British | 56 years |
| John Ferguson Bowater | Director | 12 Feb 2007 | 31 Dec 2022 | British | 77 years |
| John Foster Yeoman | Director | 29 Apr 1994 | 8 Sept 2006 | British | 65 years |
| John Gerard Wernicke Smart | Director | 27 Sept 1991 | 1 Nov 1999 | British | 81 years |
| John Gerard Wernicke Smart | Secretary | 27 Sept 1991 | 1 Nov 1999 | British | - |
| Mary Ford | Secretary | 12 Feb 2007 | 30 Mar 2012 | British | - |
| Ross William Snape | Director | 12 Sept 2005 | 30 Sept 2006 | British | 62 years |