| Anne Louise Hills | Director | 15 Feb 2005 | 1 Jul 2014 | British | 58 years |
| Armel Conyers Cates | Director | 27 Feb 2001 | 24 Jul 2012 | British | 83 years |
| Bruce John Mcness | Director | 20 Mar 1995 | 24 Sept 2004 | British | 82 years |
| Caroline Janet Banszky | Director | 29 Jan 2002 | 31 Aug 2016 | British | 73 years |
| Christopher Charles Biddulph Duffett | Director | 5 May 1992 | 9 Apr 2002 | British | 83 years |
| Christopher Smith | Director | 21 Apr 2009 | 1 Jul 2014 | British | 78 years |
| David Frank Norris | Director | 2 Dec 1992 | 14 Dec 1993 | British | 79 years |
| David Frank Norris | Director | 26 Apr 1994 | 21 Oct 2003 | British | 79 years |
| Denyse Monique Anderson | Director | 2 Dec 1992 | 14 Dec 1993 | British | 73 years |
| Denyse Monique Anderson | Director | 26 Apr 1994 | 1 Jul 2014 | British | 73 years |
| Edward Stanley Thomas | Director | 17 Dec 2002 | 1 Jul 2008 | British | 81 years |
| Ewen Cameron Stewart Macpherson | Director | 19 May 1998 | 27 Apr 2000 | British | 84 years |
| Foster Ferrier Harvey Charlton | Director | 5 May 1992 | 25 Apr 1995 | British | 103 years |
| Graham Idris Lane | Director | 2 Dec 1992 | 14 Dec 1993 | British | 90 years |
| Graham Idris Lane | Director | 22 Mar 1994 | 20 Sept 1996 | British | 90 years |
| Hester Raphaella Anne Scotton | Director | 11 Sept 2020 | 11 Oct 2024 | British | 43 years |
| Howard Clive Rumbelow | Director | 17 Nov 1992 | 19 Oct 1993 | British | 93 years |
| Hugh Daniel Osborne | Director | 5 May 1992 | 21 Apr 1998 | British | 99 years |
| Ian Kenneth Bowden | Director | 22 Jul 2003 | 1 Nov 2019 | British | 63 years |
| John Alston Morrell | Director | 5 May 1992 | 21 Apr 1998 | British | 99 years |
| John Edwards | Director | 18 Mar 1997 | 15 Apr 2003 | British | 85 years |
| John Jeremy Mckinnell Potter | Director | 5 May 1992 | 30 Nov 1992 | British | 89 years |
| John Jeremy Mckinnell Potter | Secretary | 5 May 1992 | 17 Nov 1992 | British | - |
| John Kenneth Howell | Secretary | 17 Nov 1992 | 5 Sept 1997 | British | - |
| John Maxwell Kennedy | Director | 31 Dec 1996 | 28 Mar 2000 | British | 92 years |
| Julian Robert Mason-jebb | Director | 2 Dec 1992 | 1 Jul 2014 | British | 71 years |
| Katie Elizabeth Thorpe | Director | 8 Jun 2018 | 11 Sept 2020 | British | 47 years |
| Kelly Ann Stobbs-miller | Director | 11 Sept 2020 | 18 Dec 2024 | British | 41 years |
| Mark Heddle Ashworth | Director | 1 Jul 2008 | 24 Jul 2012 | British | 67 years |
| Michael Andrew Caldicott | Director | 17 Sept 1996 | 5 Sept 1997 | British | 75 years |
| Michael Anthony Chatterton | Director | 24 Jul 2012 | 1 Jul 2014 | British | 64 years |
| Michael Charles Adams | Director | 31 Aug 2016 | 22 Oct 2017 | British | 63 years |
| Peter Michael Skeggs | Director | 16 Sept 1997 | 23 May 2003 | British | 75 years |
| Raymond Percival St George Cazalet | Director | 5 May 1992 | 19 Oct 1993 | British | 95 years |
| Richard David Rance | Director | 25 Oct 2013 | 1 Jul 2014 | British | 71 years |
| Richard Forbes Thomas | Director | 2 Dec 1992 | 14 Dec 1993 | British | 82 years |
| Richard Forbes Thomas | Director | 26 Apr 1994 | 14 May 2004 | British | 82 years |
| Richard Lawrence Bristow | Director | 26 Apr 1994 | 28 Mar 2000 | British | 97 years |
| Robert James Williams | Director | 19 Oct 1993 | 7 Apr 2009 | British | 78 years |
| Robert John Laing | Director | 24 Jul 2012 | 1 Jul 2014 | British | 73 years |
| Simone Gerarda Johanna Lavelle | Director | 24 Jul 2012 | 11 Jul 2013 | Dutch | 59 years |
| Stephen James Lister Adamson | Director | 18 Feb 2003 | 2 Feb 2004 | British | 84 years |
| Timothy Michael James Fullwood | Director | 22 Jul 2003 | 12 Jan 2018 | British | 71 years |