| Adrian David Lane | Director | 28 Oct 2014 | 9 Dec 2015 | British | 54 years |
| Alan Pateman Jones | Director | 9 Jul 2001 | 5 Aug 2004 | British | 68 years |
| Alexander Rudolf Ashton | Director | 19 Jul 1993 | 31 Mar 1994 | British | 75 years |
| Annette Marie Barnes | Director | 25 May 2017 | 31 Jan 2018 | British | 58 years |
| Antonio Lorenzo | Director | 19 May 2011 | 28 Jul 2014 | Spanish | 60 years |
| Christopher Michael Wiscarson | Director | 30 Nov 2001 | 4 Apr 2003 | British | 75 years |
| David James Stanley Oldfield | Director | 4 Mar 2016 | 2 Oct 2017 | British | 64 years |
| David John Maguire | Director | 31 May 1992 | 30 Dec 1993 | British | 75 years |
| David Simon Gilbert | Director | 30 Nov 2001 | 17 Jun 2002 | British | 79 years |
| Deborah Ann Saunders | Secretary | 31 May 1992 | 6 Jan 2010 | Other | - |
| Duncan Allan James Aitken | Director | 13 Oct 2003 | 11 Dec 2006 | British | 72 years |
| Geoffrey David Windebank | Director | 31 May 1992 | 14 Feb 2002 | British | 70 years |
| Geoffrey Ian Bailey | Director | 31 May 1992 | 9 Jul 2001 | British | 80 years |
| Graham John Lindsay | Director | 19 Apr 2000 | 9 Jul 2001 | British | 68 years |
| Graham Stuart Johns | Director | 22 Sept 1995 | 3 Oct 1997 | British | 77 years |
| Guy Mark Healey | Director | 20 Jan 2011 | 13 Sept 2011 | British | 61 years |
| Iain Kirkpatrick | Director | 1 Aug 2014 | 7 Aug 2015 | British | 54 years |
| James Robert Foster Cooper | Director | 31 May 1992 | 16 Jun 1995 | British | 85 years |
| Jeffrey Samuel Dick | Director | 9 Jul 2001 | 30 Sept 2002 | British | 70 years |
| John Hampton Roberts | Director | 10 Jun 2002 | 1 Oct 2003 | British | 70 years |
| Jonathan Burgess | Director | 3 Mar 2016 | 15 Aug 2016 | British | 56 years |
| Jonathan Charles Pain | Director | 30 Apr 1998 | 31 Jan 2000 | British | 69 years |
| Karen Lesley Winchester | Director | 20 Oct 2006 | 31 Jul 2008 | British | 62 years |
| Kenneth Melville | Secretary | 6 Jan 2010 | 21 Nov 2017 | British | - |
| Laurel Claire Powers-freeling | Director | 4 Feb 2000 | 31 Oct 2001 | British | 69 years |
| Lyndon Terence Turner | Director | 19 Apr 2000 | 17 Dec 2002 | British | 73 years |
| Mark Cheshire | Director | 13 Oct 2003 | 15 May 2009 | British | 68 years |
| Mark Timothy Miles | Director | 14 May 2012 | 12 Sept 2014 | British | 55 years |
| Markus Stadlmann | Director | 27 Jul 2015 | 6 Mar 2016 | Austrian | 59 years |
| Martin John Graves | Director | 10 Jun 2002 | 16 Jan 2004 | British | 64 years |
| Nathan Victor Moss | Director | 30 Mar 2007 | 30 Mar 2009 | British | 71 years |
| Neil Gerard O'toole | Director | 20 Oct 2006 | 21 Dec 2011 | British | 66 years |
| Peter George Edwin Ayliffe | Director | 22 Apr 2002 | 25 Sept 2003 | British | 73 years |
| Peter William Dacombe | Director | 16 Jun 1995 | 30 Apr 1998 | British | 75 years |
| Philip Robert Grant | Director | 9 Jul 2010 | 31 Oct 2014 | British | 60 years |
| Raymond John Hildreth Milne | Director | 29 Jun 2016 | 2 Oct 2017 | British | 67 years |
| Richard Anthony Charnock | Director | 30 Nov 1997 | 9 Jul 2001 | British | 67 years |
| Robert Anthony Douglas Froy | Director | 14 Jul 1993 | 30 Sept 1997 | British | 90 years |
| Roger John Barron | Director | 18 Apr 1994 | 30 Nov 1997 | British | 81 years |
| Russell Galley | Director | 2 Jan 2013 | 11 Nov 2014 | British | 63 years |
| Russell Galley | Director | 3 Mar 2016 | 2 Oct 2017 | British | 63 years |
| Sarah Deaves | Director | 27 Oct 2014 | 6 Mar 2016 | British | 65 years |
| Simon James Kenyon | Director | 11 Nov 2014 | 25 May 2017 | British | 56 years |
| Stephen Andrew Maran | Director | 30 Nov 1997 | 31 Dec 1999 | British | 86 years |
| Stuart Buckingham | Director | 3 Sept 2008 | 11 Jun 2009 | British | 60 years |
| Stuart Tilden Ransom | Director | 31 May 1992 | 22 Sept 1995 | British | 86 years |
| Thomas Woolgrove | Director | 12 May 2009 | 9 Apr 2010 | British | 56 years |
| Trevor Suarez | Director | 12 May 2009 | 30 Dec 2012 | British | 57 years |
| William Joseph Paul Mccormack | Director | 18 May 2004 | 23 Jun 2006 | British | 70 years |