| Adele Ann Abigail | Director | 7 Aug 2008 | 1 Oct 2009 | Irish | 53 years |
| Alistair Charles Walter Williams | Director | 1 May 2002 | 18 Apr 2003 | British | 63 years |
| Allen John George Sheppard | Director | 1 Mar 1992 | 1 Apr 1992 | British | 94 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 29 Jun 2009 | British | 62 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 20 Jun 2012 | British | 62 years |
| Anthony Grant Froggatt | Director | 1 Oct 1994 | 1 Sept 1998 | British | 78 years |
| Charles Alan Phillips | Director | 1 Oct 1996 | 1 Sept 1998 | American | 82 years |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Chester Joseph Evans | Director | 1 Mar 1993 | 1 Sept 1998 | American | 79 years |
| Christopher John Sandham | Director | 1 Mar 1992 | 25 Oct 1996 | British | 69 years |
| Christopher Julian Pearman | Director | 1 Mar 1992 | 31 Jul 1995 | British | 89 years |
| Christopher Mark Davies | Director | 3 Oct 2006 | 31 Mar 2009 | British | 56 years |
| Christopher Richard Roff Marsh | Director | 26 May 2006 | 30 Sept 2007 | British | 58 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| Colin James Gordon | Director | 1 Mar 1992 | 3 Mar 1997 | British | 79 years |
| David Andrew Defty | Director | 1 Mar 1992 | 1 Mar 1993 | British | 81 years |
| David Anthony Hardie | Director | 28 Apr 1994 | 1 Dec 1999 | British | 82 years |
| David Burke Rickard | Director | 1 Jun 1995 | 15 Nov 1996 | American | 80 years |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 16 Jun 2011 | 30 Jun 2020 | British | 56 years |
| David Scott | Director | 1 Sept 1998 | 31 Mar 1999 | American | 74 years |
| David Scott | Secretary | 1 Jul 1995 | 1 Sept 1998 | American | - |
| Dayalan Nayager | Director | 30 Jun 2020 | 1 Jul 2022 | South African | 45 years |
| Dennis Malamatinas | Director | 1 Jun 1995 | 13 Mar 1997 | Greek | 71 years |
| Dorotea Keresztesi | Director | 26 Sept 2022 | 14 Jun 2024 | Hungarian | 40 years |
| Dudley Alan Cordery | Director | 3 Mar 1997 | 1 Sept 1998 | British | 76 years |
| Edmond Francis Sullivan | Director | 1 May 1997 | 30 Jun 1998 | Irish | 78 years |
| Edward Martin Peachey | Director | 3 Feb 2014 | 23 May 2018 | British | 53 years |
| Emily Kellum Breslin | Secretary | 1 Jul 1995 | 1 Sept 1996 | British | - |
| Gabor Zeisler | Director | 5 Nov 2015 | 1 Aug 2020 | Hungarian | 53 years |
| Gareth Williams | Director | 25 Oct 1996 | 1 Sept 1998 | British | 73 years |
| Gavin Paul Crickmore | Director | 10 Aug 2007 | 30 Jun 2020 | British | 68 years |
| George Jeffrey Bull | Director | 1 Mar 1992 | 4 Mar 1996 | British | 90 years |
| Graham Andrews | Director | 16 Mar 2010 | 28 Nov 2011 | British | 52 years |
| Gregory David Kryder | Director | 16 Mar 2010 | 29 Nov 2011 | American | 60 years |
| Hina Patel | Director | 28 Sept 2018 | 29 Mar 2022 | British | 47 years |
| Howard Stacey Smith | Director | 1 Mar 1992 | 27 Sept 1996 | British | 88 years |
| Ian Alexander Martin | Director | 1 Apr 1992 | 30 Sept 1993 | British | 91 years |
| James Gerard O'hagan | Director | 26 May 2006 | 15 Mar 2010 | British | 72 years |
| Jean Knower Paul Marie De Ponton D'amecourt | Director | 1 Apr 1992 | 30 Jun 1995 | French | 81 years |
| Jill Kyne | Director | 18 Feb 2008 | 29 Jun 2009 | British | 62 years |
| John Brian Mcgrath | Director | 1 Mar 1992 | 18 Dec 2000 | British | 88 years |
| John James Nicholls | Director | 16 Jun 2011 | 9 Mar 2018 | British | 64 years |
| John James Nicholls | Secretary | 15 Mar 2002 | 2 Feb 2012 | British | - |
| John Michael Joseph Keenan | Director | 4 Mar 1996 | 30 Oct 2001 | American | 90 years |
| Jonathan Michael Guttridge | Secretary | 5 Jan 2018 | 20 Apr 2018 | - | - |
| Jose Alberto Ibeas Franco | Director | 16 Dec 2011 | 3 Feb 2014 | Spanish | 54 years |
| Kara Elizabeth Major | Director | 1 Aug 2018 | 24 Sept 2018 | American | 49 years |
| Kerryn Louise Haynes | Director | 23 May 2018 | 30 Jun 2020 | British | 56 years |
| Lisa Lunoe | Director | 30 Jun 2020 | 22 Aug 2024 | Australian,british | 46 years |
| Mark David Peters | Secretary | 1 Sept 1998 | 10 Nov 2000 | British | - |
| Martine Alice Petetin | Secretary | 1 Jul 1995 | 1 Sept 1996 | British | - |
| Matthew John Lester | Director | 31 Jan 2003 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 7 Apr 2005 | 15 Jun 2008 | British | 69 years |
| Michael Garwood Delahooke | Director | 1 Apr 1992 | 31 Dec 1995 | British | 91 years |
| Michael Stanley Leathes | Secretary | 1 Mar 1992 | 30 Jun 1995 | British | - |
| Nandor Makos | Director | 26 May 2006 | 1 Aug 2014 | Hungarian | 62 years |
| Nandor Szakolczai | Director | 30 Jun 2020 | 26 Sept 2022 | Hungarian | 48 years |
| Nicholas Charles Rose | Director | 15 Nov 1996 | 1 Jul 1999 | British | 69 years |
| Nigel John Arthur | Director | 12 Mar 2007 | 15 Mar 2010 | British | 65 years |
| Paul Benedict Armstrong | Director | 16 Mar 2010 | 31 Dec 2014 | Irish | 69 years |
| Paul Derek Tunnacliffe | Director | 7 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paul Francis Curtis | Director | 1 Mar 1992 | 1 Jun 1996 | British | 86 years |
| Paul Steven Walsh | Director | 20 Apr 2000 | 9 Mar 2006 | British | 71 years |
| Paviter Singh Binning | Director | 18 Apr 2001 | 3 Oct 2003 | British | 66 years |
| Phillip Keague Bentley | Director | 1 Jul 1999 | 31 Oct 2000 | British | 67 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Raymond James Joy | Director | 10 Dec 2001 | 22 Jun 2007 | British | 72 years |
| Robert Joseph Moore | Director | 31 Oct 2001 | 31 Jan 2003 | American | 65 years |
| Robert Michael Furek | Director | 1 Mar 1992 | 12 Nov 1996 | Usa | 84 years |
| Robert Moore | Director | 26 May 2006 | 31 Aug 2006 | American | 65 years |
| Roger Hugh Myddleton | Director | 18 Apr 2001 | 31 Mar 2003 | British | 84 years |
| Sharon Lynnette Fennessy | Director | 28 Sept 2018 | 9 Aug 2021 | Irish | 59 years |
| Stephen John Bolton | Director | 1 Apr 2011 | 28 Sept 2018 | British | 64 years |
| Susanne Margaret Bunn | Director | 15 Mar 2002 | 4 Jan 2008 | British | 67 years |
| Susanne Margaret Bunn | Secretary | 10 Nov 2000 | 15 Mar 2002 | British | - |
| Thorsten Knopp | Director | 26 May 2006 | 19 Jan 2007 | German | 63 years |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |
| Walter Hunter Caldwell | Director | 1 Sept 1998 | 30 Apr 2002 | British | 79 years |