| Alan John Trotter | Director | 22 May 2009 | 27 Nov 2009 | British | 58 years |
| Alexander Robert Wolny | Director | 18 Jun 2013 | 1 Mar 2016 | British | 53 years |
| Allan Grassom Mcluckie | Director | 1 Oct 1998 | 18 Feb 2000 | British | 71 years |
| Andrea Margaret Blance | Director | 6 Dec 2002 | 18 Jul 2008 | British | 62 years |
| Andrea Margaret Blance | Director | 18 Jun 2013 | 13 Nov 2014 | British | 62 years |
| Andrew David Fairhurst | Secretary | 30 May 1992 | 23 Aug 1993 | British | - |
| Andrew Michael Crossley | Director | 7 Dec 1999 | 31 Mar 2000 | British | 70 years |
| Carol Ann Dockrell | Secretary | 12 May 1997 | 21 Jun 2000 | British | - |
| Catherine Rosemary Reid Avery | Director | 1 Jan 1998 | 28 Jan 2009 | British | 66 years |
| Christopher James Knight | Director | 13 Nov 2014 | 3 Nov 2015 | British | 58 years |
| Colin Charles Harris | Director | 30 May 1992 | 30 Sept 1996 | British | 82 years |
| David Wyn Binding | Secretary | 21 Jun 2000 | 1 Oct 2002 | British | - |
| Elaine Margaret Maclean | Director | 23 Apr 2008 | 10 Nov 2017 | British | 64 years |
| Emma Hardaker-jones | Director | 10 Nov 2017 | 30 Sept 2025 | British | 53 years |
| Gareth John Hoskin | Director | 21 Jun 2000 | 5 Nov 2007 | British | 66 years |
| Geoffrey Timms | Director | 18 Jan 1999 | 21 Jun 2000 | British | 66 years |
| Jacqueline Dorothy Mary Noakes | Director | 19 Feb 2010 | 29 Jun 2018 | Irish | 65 years |
| James Michael Bury | Director | 5 Nov 2007 | 22 May 2009 | British | 65 years |
| John Brackenridge Pollock | Director | 11 Dec 2003 | 15 Feb 2013 | British | 68 years |
| John Derek Whorwood | Director | 30 May 1992 | 30 Sept 1996 | British | 75 years |
| John Martin Maccarthy | Director | 30 Sept 1996 | 31 Dec 2001 | British | 81 years |
| Margaret Ann Smith | Director | 2 Dec 1996 | 1 Jan 1998 | British | 77 years |
| Mark Julian Gregory | Director | 1 Jan 2002 | 11 Dec 2003 | British | 63 years |
| Mark Julian Gregory | Director | 11 Feb 2009 | 3 Jun 2011 | British | 63 years |
| Mark Julian Gregory | Director | 26 Aug 2011 | 15 Feb 2013 | British | 63 years |
| Nicola Jane Burnand | Director | 8 Jun 2012 | 1 Apr 2016 | British | 56 years |
| Nigel Leslie Collard | Director | 30 Sept 1996 | 31 Mar 2000 | British | 78 years |
| Robert Peter Sewell | Director | 31 Dec 2006 | 27 Mar 2007 | Irish | 62 years |
| Robin Ashley Phipps | Director | 21 Jun 2000 | 13 Jul 2007 | British | 76 years |
| Simon Jonathan Burke | Director | 1 Apr 2016 | 4 Sept 2018 | British | 63 years |
| Susan Margaret Hunter | Director | 25 Apr 2016 | 4 Nov 2019 | British | 57 years |
| Thomas Andrew Forwood Smith | Secretary | 23 Aug 1993 | 18 Apr 1997 | British | - |