| 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 John Mcdonald | Director | 5 Nov 1992 | 1 Sept 1994 | British | 79 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 29 Jun 2009 | British | 62 years |
| Andrew Mark Smith | Director | 29 Jun 2009 | 2 Feb 2012 | British | 62 years |
| Aniko Mahler | Director | 5 Nov 2015 | 1 Aug 2018 | Hungarian | 50 years |
| Brendan Michael Carr | Director | 5 Nov 1992 | 30 Apr 1994 | British | 86 years |
| Brendan Michael Carr | Secretary | 5 Nov 1992 | 30 Apr 1994 | British | - |
| Brian Humphrey Morrison | Director | 6 Aug 1996 | 30 Jun 1997 | British | 80 years |
| Bruce Nelson Proctor | Secretary | 15 Dec 2003 | 30 Jun 2013 | British | - |
| Charles Dawson Coase | Director | 7 Apr 2005 | 31 Mar 2011 | British | 66 years |
| Claire Elizabeth Matthews | Secretary | 2 Feb 2012 | 5 Jan 2018 | - | - |
| Dana Gilland | Secretary | 21 Dec 2001 | 15 Dec 2003 | British | - |
| David Frederick Harlock | Director | 26 May 2016 | 1 Aug 2018 | British | 66 years |
| David Heginbottom | Director | 24 Mar 2011 | 2 Feb 2012 | British | 56 years |
| Gary Paul Wyatt | Director | 27 Jul 1998 | 30 Jun 2002 | British | 60 years |
| Gary Paul Wyatt | Secretary | 23 Jul 2001 | 21 Dec 2001 | British | - |
| Gavin Paul Crickmore | Director | 24 Mar 2011 | 2 Feb 2012 | British | 68 years |
| Geoffrey Mark Parmiter | Director | 1 Sept 1994 | 31 Dec 1996 | British | 65 years |
| George Gater | Director | 5 Nov 1992 | 1 Sept 1994 | Scottish | 81 years |
| Gordon Alexander Hessey | Director | 5 Nov 1992 | 30 Jun 1997 | United Kingdom | 81 years |
| Ian Anthony Hockney | Director | 1 Oct 2014 | 5 Nov 2015 | British | 51 years |
| Ian Michael Harris | Director | 1 Jul 1997 | 21 Dec 2001 | British | 71 years |
| Joanne Elizabeth Malcolm | Director | 30 Apr 1994 | 23 Jul 2001 | British | 70 years |
| Joanne Elizabeth Malcolm | Secretary | 30 Apr 1994 | 23 Jul 2001 | British | - |
| John James Nicholls | Director | 24 Mar 2011 | 9 Mar 2018 | British | 64 years |
| John James Nicholls | Secretary | 21 Dec 2001 | 2 Feb 2012 | British | - |
| John Robert Ratcliffe | Director | 1 Jan 1997 | 30 Jun 2002 | British | 69 years |
| Jon Patrick Mullen | Director | 1 Jul 1997 | 27 Jul 1998 | British | 69 years |
| Jonathan Michael Guttridge | Secretary | 5 Jan 2018 | 20 Apr 2018 | - | - |
| Jonathan Patrick Mullen | Director | 5 Nov 1992 | 6 Aug 1996 | British | 69 years |
| Jose Alberto Ibeas Franco | Director | 16 Dec 2011 | 2 Feb 2012 | Spanish | 54 years |
| Julie Anne Page | Director | 1 Aug 2000 | 21 Dec 2001 | British | 62 years |
| Martin John Frost | Director | 1 Jan 1997 | 30 Jun 1999 | British | 76 years |
| Matthew John Lester | Director | 7 Apr 2005 | 31 Aug 2006 | British | 63 years |
| Michael Christopher Flynn | Director | 7 Apr 2005 | 15 Jun 2008 | British | 69 years |
| Michael Patrick Hill | Director | 1 Sept 1994 | 30 Apr 1996 | British | 71 years |
| Nandor Makos | Director | 26 May 2006 | 22 Nov 2010 | Hungarian | 62 years |
| Nandor Makos | Director | 1 Dec 2010 | 1 Aug 2014 | Hungarian | 62 years |
| Paul Derek Tunnacliffe | Director | 17 Jan 2008 | 30 Jun 2016 | British | 64 years |
| Paul Ellis Breach | Director | 5 Nov 1992 | 31 Dec 1995 | United Kingdom | 81 years |
| Paviter Singh Binning | Director | 21 Dec 2001 | 3 Oct 2003 | British | 66 years |
| Ravi Rajagopal | Director | 3 Oct 2003 | 7 Apr 2005 | British | 71 years |
| Richard Desmond Macadam | Director | 1 Aug 2000 | 1 Oct 2001 | British | 69 years |
| Roger Hugh Myddelton | Director | 21 Dec 2001 | 31 Mar 2003 | British | 84 years |
| Stephen John Bolton | Director | 1 Apr 2011 | 2 Feb 2012 | British | 64 years |
| Susanne Margaret Bunn | Director | 21 Dec 2001 | 4 Jan 2008 | British | 67 years |
| Thomas Mark Timothy Wallis | Director | 1 Jul 1997 | 21 Dec 2001 | British | 69 years |
| Victoria Cooper | Secretary | 5 Nov 2015 | 23 Mar 2017 | - | - |