| 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 |
| Andrew Mark Smith | Director | 29 Jun 2009 | 2 Feb 2012 | British | 62 years |
| Anna Olive Magdelene Manz | Director | 6 Apr 2009 | 1 Sept 2010 | British | 53 years |
| Anne Patricia Mccarthy | Secretary | 16 Feb 1996 | 7 Jan 1998 | British | - |
| Bryan Donaghey | Director | 21 Feb 1997 | 7 Jan 1998 | British | 65 years |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Charles Dawson Coase | Director | 2 Aug 1990 | 13 Apr 1990 | British | 66 years |
| Charles Dawson Coase | Director | 13 Apr 1993 | 13 Apr 1995 | British | 66 years |
| Christopher Mark Lewin | Director | 1 Aug 2020 | 30 Sept 2021 | British | 64 years |
| Christopher Richard Roff Marsh | Director | 31 Aug 2006 | 30 Sept 2007 | British | 58 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| Csaba Hajos | Director | 13 Mar 2019 | 26 Sept 2022 | Hungarian | 49 years |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 9 Sept 2010 | 1 Oct 2014 | British | 56 years |
| Deirdre Ann Mahlan | Director | 27 Apr 2007 | 13 Dec 2010 | American | 64 years |
| Derek John Councell | Director | 2 Aug 1990 | 13 Apr 1990 | British | 89 years |
| Douglas Carter Stainton | Director | 7 Jan 1998 | 30 Jun 2000 | British | 82 years |
| Edward Mcshane | Director | 1 Oct 2014 | 31 Aug 2017 | British | 54 years |
| Gavin Paul Crickmore | Director | 28 Jun 2007 | 1 Oct 2009 | British | 68 years |
| Geoffrey William King | Director | 19 Apr 1989 | 13 Apr 1993 | British | 82 years |
| Geoffrey William King | Director | 30 Sept 1994 | 7 Jan 1998 | British | 82 years |
| George Henry Turvey | Director | 19 Apr 1989 | 30 Sept 1994 | British | 93 years |
| George Henry Turvey | Secretary | 26 Sept 1990 | 24 Feb 1992 | British | - |
| György Geiszl | Director | 9 Sept 2010 | 1 Oct 2013 | Hungarian | 58 years |
| Ian Scott | Director | 13 Apr 1993 | 13 Apr 1995 | British | 72 years |
| Ian Stewart Cray | Director | 30 Jun 2000 | 12 Jan 2001 | British | 69 years |
| James Donald Graham Campbell | Director | 12 Jun 1990 | 13 Apr 1990 | British | 73 years |
| James Donald Graham Campbell | Director | 19 Mar 1991 | 27 Nov 1992 | British | 73 years |
| Jill Kyne | Director | 28 Jun 2007 | 29 Jun 2009 | British | 62 years |
| Joel Wayne Walters | Director | 30 Jun 2000 | 14 Jun 2004 | American | 68 years |
| John James Nicholls | Director | 24 Mar 2011 | 9 Mar 2018 | British | 64 years |
| John James Nicholls | Secretary | 20 Dec 2001 | 2 Feb 2012 | British | - |
| Jonathan Michael Guttridge | Secretary | 5 Jan 2018 | 8 Mar 2018 | - | - |
| Jose Alberto Ibeas Franco | Director | 24 Mar 2011 | 2 Feb 2012 | Spanish | 54 years |
| Keith Hamill | Director | 2 Aug 1990 | 13 Apr 1990 | British | 74 years |
| Kevin John Plummer | Director | 14 Mar 1994 | 21 Feb 1997 | British | 64 years |
| Mark David Peters | Director | 16 Feb 1996 | 10 Nov 2000 | British | 67 years |
| Matthew John Lester | Director | 31 Jan 2003 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 31 Aug 2006 | 15 Jun 2008 | British | 69 years |
| Nicola Mary Coyle | Director | 27 Nov 1992 | 16 Feb 1996 | British | 60 years |
| Nicola Mary Coyle | Secretary | 24 Feb 1992 | 16 Feb 1996 | British | - |
| Paul Derek Tunnacliffe | Director | 7 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paviter Singh Binning | Director | 12 May 1999 | 3 Oct 2003 | British | 66 years |
| Philip Edward Yea | Director | 1 May 1991 | 1 May 1992 | British | 72 years |
| Phillip Keague Bentley | Director | 7 Jan 1998 | 30 Jun 2000 | British | 67 years |
| Prabhaharan Viswanathan | Director | 31 Aug 2017 | 1 Aug 2020 | Australian | 54 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Raymond King | Director | 7 Jan 1998 | 12 May 1999 | British | 73 years |
| Richard Gregory Curtis | Secretary | 31 Aug 1989 | 26 Sept 1990 | British | - |
| Robert Joseph Moore | Director | 15 Jan 2001 | 31 Jan 2003 | American | 65 years |
| Roger Hugh Myddelton | Director | 6 Aug 1999 | 31 Mar 2003 | British | 84 years |
| Sally Catherine Moore | Director | 28 Jun 2007 | 24 Mar 2011 | British | 61 years |
| Sharon Lisa Pirozzolo | Secretary | 19 Apr 1989 | 31 Aug 1989 | British | - |
| Sharon Lynnette Fennessy | Director | 1 Oct 2014 | 1 Feb 2017 | Irish | 59 years |
| Simeon Galpert | Director | 19 May 1997 | 5 Jan 1998 | British | 79 years |
| Simon Douglas Coward | Director | 5 May 2003 | 31 Jul 2003 | British | 66 years |
| Stephen John Bolton | Director | 1 Apr 2011 | 2 Feb 2012 | British | 64 years |
| Susanne Margaret Bunn | Director | 5 May 2003 | 4 Jan 2008 | British | 67 years |
| Susanne Margaret Bunn | Secretary | 7 Jan 1998 | 24 Jan 2003 | British | - |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |
| Vinod Rao | Director | 30 Jan 2017 | 13 Mar 2019 | Indian | 64 years |