| Alain Henri Pierre Dromer | Director | 5 Jan 2009 | 29 Sept 2011 | French | 72 years |
| Alan Gadd | Director | 18 Sept 2001 | 1 Apr 2005 | British | 66 years |
| Andrew Mark Beswick | Director | 20 Dec 2012 | 1 Sept 2014 | British | 57 years |
| Andrew Robert Myles Brown | Director | 2 Feb 2016 | 22 Jul 2016 | British | 58 years |
| Angela Charlotte Seymour-jackson | Director | 20 Jan 2009 | 31 Dec 2010 | British | 60 years |
| Barry Alexander Fowler | Director | 6 Sept 2021 | 15 Jan 2025 | British | 53 years |
| Barry Bryan Knights | Secretary | 5 Mar 1993 | 13 Apr 1993 | British | - |
| Barry Michael Wingrove | Director | 21 Mar 1997 | 29 Sept 1999 | British | 87 years |
| Bernard Andrew Curran | Director | 20 Jul 2012 | 7 Mar 2014 | British | 58 years |
| Cathryn Elizabeth Riley | Director | 12 Feb 2007 | 31 Dec 2008 | British | 64 years |
| Christopher Stephen Armstrong | Director | 1 Jan 1996 | 30 Apr 1997 | British | 82 years |
| Clifford James Abrahams | Director | 1 Jul 2015 | 31 Dec 2015 | British | 59 years |
| David Alexandre Simon Dahan | Director | 25 Jun 2014 | 31 Mar 2016 | French | 57 years |
| David Barclay Barral | Director | 1 Apr 2005 | 13 Feb 2007 | British | 64 years |
| David Clayton | Director | 5 Apr 2017 | 31 Aug 2020 | British | 64 years |
| David Ernest Parker | Secretary | 13 Apr 1993 | 15 Mar 1999 | British | - |
| David Kenneth Watson | Director | 16 Dec 2003 | 1 Apr 2005 | British | 67 years |
| David Ross Hilton Heslop | Director | 30 Apr 2003 | 13 Feb 2007 | British | 66 years |
| David Rowlinson | Director | 10 Nov 1997 | 19 Sept 2000 | British | 69 years |
| David Stephen Skinner | Director | 10 Feb 2017 | 16 Jul 2019 | British | 57 years |
| Donald Stuart Macmillan | Director | 17 Nov 2020 | 31 Mar 2022 | British | 50 years |
| Dudley Mark Hewitt Skinner | Director | 13 Nov 1998 | 18 Jan 2001 | British | 70 years |
| Edward Eliphalet Potter | Director | 9 Jun 2014 | 19 Oct 2015 | American | 67 years |
| Emily Cherry Bishop | Director | 6 Apr 1999 | 7 Apr 2000 | British | 80 years |
| Eric Michael Sandland | Director | 11 Apr 1994 | 30 Sept 1994 | British | 88 years |
| Erich Paul Gerth | Director | 21 Apr 2010 | 20 Jul 2012 | American | 63 years |
| Geoffrey John Mason Shaw | Director | 5 Mar 1993 | 31 Dec 1995 | British | 83 years |
| Gillian Barbara Cass | Director | 16 Jun 2016 | 8 Feb 2017 | British | 50 years |
| Graeme John Hourston Miller | Director | 20 Dec 2017 | 31 Dec 2019 | British | 58 years |
| Graham Stirling Boffey | Director | 18 Feb 2011 | 5 Dec 2012 | British | 63 years |
| Iain Keith Buckle | Director | 4 Jun 2014 | 13 May 2022 | British | 58 years |
| James Allen Newman | Director | 1 Apr 2005 | 1 Jun 2005 | British | 62 years |
| James Anthony Heyworth-dunne | Director | 1 Jan 1996 | 31 Oct 1999 | British | 82 years |
| Jane Elizabeth Adamson | Director | 9 May 2022 | 12 Jan 2025 | British | 47 years |
| Jeremy Hart Leadsom | Director | 6 Apr 2017 | 27 Sept 2019 | British | 67 years |
| Jeremy Keith Soutter | Director | 18 Nov 1999 | 1 Mar 2002 | British | 64 years |
| John David Stanforth | Director | 1 Jan 1996 | 30 Sept 1996 | British | 85 years |
| John Misselbrook | Director | 10 Jun 2014 | 23 Nov 2017 | British | 76 years |
| John Paul Clougherty | Director | 5 Jan 2009 | 27 Mar 2012 | British | 60 years |
| John Robert Lister | Director | 9 Jul 2009 | 7 Jun 2011 | British | 68 years |
| Jonathon Ronald Herbert | Director | 7 Jan 1997 | 13 Nov 1998 | British | 70 years |
| Julie Dawn Green | Director | 31 Jul 2013 | 1 Sept 2014 | British | 57 years |
| Keith Jones | Director | 8 Nov 1999 | 1 Apr 2005 | British | 74 years |
| Kevin Anthony Moss | Director | 7 Jun 2011 | 13 Mar 2012 | British | 60 years |
| Linda Woolterton | Director | 13 Nov 1998 | 19 Sept 2000 | British | 69 years |
| Mark Barry Ewart White | Director | 10 Oct 2019 | 14 Dec 2023 | British | 71 years |
| Mark Jeffrey Buckley | Director | 23 Apr 2009 | 12 Nov 2009 | United States | 64 years |
| Mark Richard Beavis Versey | Director | 30 Sept 2020 | 30 Apr 2021 | British | 54 years |
| Mark Steven Hodges | Director | 12 Feb 2007 | 30 Apr 2010 | British | 61 years |
| Mary Elizabeth Ward | Secretary | 16 Mar 1999 | 8 Nov 2000 | British | - |
| Maurice Gerard Quirke | Director | 18 Oct 1999 | 16 Dec 2003 | British | 66 years |
| Melvyn Robert Harold Lay | Director | 1 Jan 1996 | 19 Sept 2000 | British | 79 years |
| Michael David Thomas Craston | Director | 22 Mar 2016 | 8 Feb 2017 | British | 68 years |
| Michael David Thomas Craston | Director | 1 Nov 2017 | 16 Apr 2024 | British | 68 years |
| Michael Nicholas Biggs | Director | 5 Mar 1993 | 30 Dec 1994 | British | 74 years |
| Michael Terence Kirsch | Director | 5 Jun 2003 | 1 Apr 2005 | British | 65 years |
| Michael Terence Kirsch | Director | 29 Jun 2005 | 14 Sept 2006 | British | 65 years |
| Nicholas Andrew Courtenay-smith | Director | 1 Apr 1994 | 13 Nov 1998 | British | 76 years |
| Nicholas David Alford | Director | 1 Sept 2003 | 1 Apr 2005 | British | 72 years |
| Nicolaos Nicandrou | Director | 30 Nov 2006 | 27 Apr 2009 | British | 61 years |
| Patrick John Neville | Director | 29 Sept 2011 | 20 Jul 2012 | British | 66 years |
| Patrick John Neville | Director | 16 Apr 2014 | 30 Jun 2015 | British | 66 years |
| Patrick Joseph Edward Smith | Director | 1 Oct 1996 | 13 Nov 1998 | British | 77 years |
| Peter Colin Frank Haynes | Director | 19 Sept 2000 | 19 Nov 2001 | British | 72 years |
| Peter Frederick Baynham | Director | 1 Oct 1994 | 31 Dec 1995 | British | 73 years |
| Philip Charles Easter | Director | 22 Mar 1995 | 31 Dec 1995 | British | 73 years |
| Philip Gordon Scott | Director | 5 Mar 1993 | 13 Nov 1998 | British | 72 years |
| Philip John Tindal | Director | 10 Nov 1997 | 13 Nov 1998 | British | 79 years |
| Richard Alan Sidwell | Director | 13 Nov 1998 | 19 Sept 2000 | British | 70 years |
| Richard Antony Johns | Director | 19 Sept 2000 | 31 Jan 2002 | British | 58 years |
| Richard John Harvey | Director | 21 Jul 1993 | 31 Dec 1995 | British | 76 years |
| Richard Marcus Prew | Director | 5 May 2000 | 27 Nov 2000 | British | 59 years |
| Roger Bellinger | Director | 5 Mar 1993 | 31 Mar 1994 | British | 87 years |
| Ronald Calver | Director | 5 Mar 1993 | 30 Jun 1993 | British | 81 years |
| Sally Winstanley | Director | 20 Oct 2021 | 31 Aug 2024 | British | 54 years |
| Simon Timothy Quick | Director | 1 Apr 2005 | 16 Dec 2005 | British | 65 years |
| Siobhan Geraldine Boylan | Director | 5 Jan 2009 | 21 Jul 2011 | British | 57 years |
| Stephen Andrew Joseph Mann | Director | 1 Apr 2005 | 20 Jul 2005 | British | 61 years |
| Stewart Cazier | Director | 13 Nov 1998 | 16 Sept 2000 | British | 61 years |
| Susan Patricia Janet Ebenston | Director | 17 Dec 2014 | 31 Mar 2021 | British | 67 years |
| Suzanne Guy | Director | 1 Apr 2005 | 30 Sept 2006 | British | 62 years |
| Thomas Aird Fraser | Director | 1 Jan 1996 | 10 Nov 1997 | Australian | 67 years |
| Timothy Richard Orton | Director | 15 May 2006 | 1 Mar 2007 | British | 55 years |
| Timothy Richard Orton | Director | 26 Jan 2009 | 27 Feb 2015 | British | 55 years |
| Toby Emil Strauss | Director | 30 Mar 2010 | 23 May 2011 | British | 67 years |