| Anthony Robert Cobbe | Director | 9 Dec 1994 | 17 Aug 1998 | American | 83 years |
| Clive James Whorton | Secretary | 6 Jun 1997 | 21 Nov 2001 | British | - |
| Craig George Donaldson | Director | 22 Mar 2002 | 30 Sept 2002 | British | 59 years |
| Craig George Donaldson | Secretary | 21 Nov 2001 | 31 Mar 2016 | British | - |
| Damian Hugh Reid | Director | 23 Nov 1999 | 14 Feb 2000 | British | 64 years |
| David Baxter Newlands | Director | 1 Mar 1993 | 7 Jul 1997 | British | 80 years |
| David Owen Lewis | Director | 26 Nov 1999 | 22 Mar 2002 | British | 70 years |
| Dennis Andrew Badman | Director | 23 Feb 2006 | 10 Nov 2006 | British | 54 years |
| Dennis Andrew Badman | Director | 20 Aug 2007 | 1 Oct 2010 | British | 54 years |
| Eric Donald Green | Director | 19 Oct 2000 | 28 Feb 2001 | British | 69 years |
| Erwin Hardt | Director | 1 Mar 1993 | 13 Sept 1995 | German | 95 years |
| Francis John Mckay | Director | 17 Sept 2019 | 30 Jun 2020 | British | 81 years |
| George Simpson | Director | 5 Jan 1998 | 17 Aug 1998 | British | 84 years |
| Gillian Bonthron | Director | 26 Nov 2024 | 5 Sept 2025 | British | 49 years |
| Graham Geoffrey Daniel | Secretary | 1 Mar 1993 | 6 Jun 1997 | British | - |
| Hans Michael Kuebler | Director | 1 Jan 1994 | 17 Feb 1997 | German | 87 years |
| Heather Marie Green | Director | 11 Sept 2019 | 31 Mar 2025 | British | 55 years |
| Helen Jane Johnstone | Director | 23 Feb 2006 | 10 Nov 2006 | British | 53 years |
| Herbert Asmusser | Director | 1 Mar 1993 | 30 Sept 1993 | Danish | 96 years |
| Jack Raymond Fryer | Director | 5 Jan 1998 | 17 Aug 1998 | British | 87 years |
| Jacqueline Long | Director | 22 Mar 2002 | 30 Sept 2002 | British | 58 years |
| James Nicholas Czerniewski | Secretary | 23 Aug 2022 | 31 Jul 2025 | - | - |
| Janice Meade | Director | 10 Jan 2012 | 30 Jun 2021 | British | 71 years |
| Jemimah Parnell | Director | 1 Jul 2021 | 31 Jul 2025 | British | 62 years |
| Joanne Claire Gretton | Director | 23 Feb 2006 | 10 Nov 2006 | British | 51 years |
| Joanne Claire Gretton | Director | 17 Mar 2020 | 24 Oct 2025 | British | 51 years |
| Jochen Hans Mackenrodt | Director | 1 Mar 1993 | 13 Sept 1995 | German | 96 years |
| John Charles Mayo | Director | 7 Nov 1997 | 17 Aug 1998 | British | 70 years |
| John Paul Kimpton | Director | 23 Feb 2006 | 7 Jan 2025 | British | 55 years |
| Karl Heinz Midunsky | Director | 13 Sept 1995 | 4 Aug 1998 | British | 82 years |
| Kathryn Margaret Ann Lowey | Director | 14 Aug 2003 | 18 Jan 2006 | British | 70 years |
| Kenneth Stephen Alexander Douglas | Director | 22 Mar 2002 | 11 Sept 2002 | British | 70 years |
| Kevin David Smith | Secretary | 28 Sept 2007 | 29 Jul 2011 | British | - |
| Liam Gregory Brown | Director | 14 Aug 2003 | 18 Jan 2006 | British | 65 years |
| Luan Rosalie Hughes | Director | 1 Aug 2023 | 9 Oct 2025 | British | 50 years |
| Lucy May Barratt | Secretary | 19 Jul 2016 | 3 Jun 2021 | - | - |
| Malcolm Rowland Bates | Director | 1 Mar 1993 | 27 Mar 1997 | British | 92 years |
| Mark Edward Plato | Director | 21 Feb 2003 | 10 Nov 2006 | British | 67 years |
| Mark Edward Plato | Director | 5 Oct 2010 | 8 Sept 2019 | British | 67 years |
| Mark Graham Banfield | Director | 23 Feb 2006 | 17 Oct 2008 | British | 68 years |
| Mark Graham Banfield | Director | 6 Nov 2008 | 31 Mar 2010 | British | 68 years |
| Martin Harriman | Director | 14 Aug 2003 | 30 Mar 2004 | British | 64 years |
| Michael Francis Patrick Surrey | Director | 19 Dec 2000 | 22 Mar 2002 | British | 59 years |
| Michael Francis Patrick Surrey | Director | 5 Nov 2002 | 10 Nov 2006 | British | 59 years |
| Michael Jonathan Bond | Director | 23 Feb 2006 | 10 Nov 2006 | British | 75 years |
| Michael Lester | Director | 23 Jul 1997 | 17 Aug 1998 | British | 86 years |
| Michael William John Parton | Director | 1 Mar 1993 | 13 Sept 1995 | British | 72 years |
| Michael William John Parton | Director | 17 Aug 1998 | 22 Mar 2002 | British | 72 years |
| Neil David Sutcliffe | Director | 19 Dec 2000 | 22 Mar 2002 | British | 64 years |
| Neil David Sutcliffe | Director | 30 Sept 2002 | 18 Jan 2006 | British | 64 years |
| Nigel John Baldwin | Director | 23 Feb 2006 | 20 Jan 2009 | British | 71 years |
| Norman Charles Porter | Director | 23 Nov 1999 | 14 Feb 2000 | British | 75 years |
| Norman Charles Porter | Director | 22 Mar 2002 | 31 Jul 2002 | British | 75 years |
| Patricia Dooley | Director | 14 Aug 2003 | 18 Jan 2006 | British | 55 years |
| Paul Michael Harris | Director | 14 Aug 2003 | 7 Oct 2008 | British | 68 years |
| Peter Hans Pribilla | Director | 13 Sept 1995 | 7 Nov 1997 | German | 85 years |
| Peter Johnson | Director | 30 Sept 2002 | 23 Dec 2005 | British | 74 years |
| Peter Oliver Gershon | Director | 1 Mar 1993 | 23 Jul 1997 | British | 79 years |
| Peter Rodney Brown | Director | 26 Nov 1999 | 22 Mar 2002 | British | 84 years |
| Richard Gurdon Reynolds | Director | 1 Mar 1993 | 8 Nov 1995 | British | 87 years |
| Robert Huelin Green | Director | 30 Sept 2002 | 14 Aug 2003 | British | 58 years |
| Robin Edward Poole | Director | 28 Feb 2001 | 14 Feb 2002 | British | 66 years |
| Rodney James Smith | Director | 30 Sept 2002 | 18 Jan 2006 | British | 72 years |
| Roland Koch | Director | 7 Nov 1997 | 4 Aug 1998 | Germany | 80 years |
| Simon Andrew Weinstock | Director | 1 Mar 1993 | 18 May 1996 | British | 74 years |
| Stephen Graham Faucherand | Director | 5 Oct 2010 | 5 Mar 2012 | British | 75 years |
| Stephen James Harris | Director | 23 Feb 2006 | 31 Mar 2010 | British | 67 years |
| Stephen John Collins | Director | 11 Feb 2008 | 5 Oct 2010 | British | 66 years |
| Stephen Pears | Director | 20 Dec 2011 | 31 May 2017 | British | 71 years |
| Steve Hare | Director | 13 Sept 1995 | 17 Feb 1997 | British | 65 years |
| Steve Hare | Director | 9 Sept 1999 | 22 Mar 2002 | British | 65 years |
| Steven Andrew Berg | Director | 17 Feb 1997 | 9 Sept 1999 | British | 72 years |
| Thomas Oliver Walshe | Director | 14 Aug 2003 | 18 Jan 2006 | Irish | 67 years |
| Volker Jung | Director | 7 Nov 1997 | 4 Aug 1998 | German | 87 years |
| William Edwin Johnson | Director | 14 Aug 2003 | 18 Jan 2006 | British | 57 years |