| Anthony Joseph Sabey | Secretary | 1 Jun 2005 | 1 Mar 2007 | British | - |
| Benjamin John Guyatt | Director | 24 Jun 2011 | 1 Sept 2012 | British | 51 years |
| Benjamin John Guyatt | Director | 1 Mar 2014 | 1 Sept 2014 | British | 51 years |
| Brenda Lily Wilkinson | Secretary | 20 Jun 1991 | 1 Jun 2005 | British | - |
| Brian Charleton | Director | 1 Nov 2012 | 28 Feb 2014 | British | 58 years |
| Brian Charleton | Director | 3 Feb 2017 | 10 Dec 2020 | British | 58 years |
| Brian John Garratt | Director | 1 Jan 2009 | 31 Jan 2011 | British | 70 years |
| Carsten Matthias Wendt | Director | 1 Dec 2016 | 26 Apr 2022 | German | 50 years |
| Charles Edward Denman | Director | 1 Mar 2007 | 24 Dec 2008 | British | 80 years |
| Daniel John Cooper | Director | 1 Jan 2016 | 31 Jan 2019 | Australian | 56 years |
| David John Szymanski | Director | 1 Mar 2007 | 30 Nov 2009 | British | 72 years |
| David Jonathan Clarke | Director | 12 Sept 2013 | 1 Dec 2016 | British | 52 years |
| Ellen Marie Hogan | Director | 1 Sept 2012 | 28 Feb 2014 | British | 54 years |
| Geoffrey Sterling Ian Irvine | Director | 20 Jun 1991 | 9 Jul 2008 | British | 83 years |
| Gerard Anderson | Director | 26 Mar 1999 | 31 Dec 2011 | British | 71 years |
| Gerard Feenan | Director | 1 Jan 2009 | 31 Jan 2011 | British | 74 years |
| Graham Dransfield | Secretary | 1 Jan 2008 | 30 Jun 2008 | British | - |
| James Alexander Claydon | Director | 30 Nov 2009 | 1 Sept 2012 | British | 66 years |
| Jonathan Charles Whitlock | Director | 26 Mar 1999 | 5 May 2021 | British | 62 years |
| Jonathan David Cook | Director | 13 Jun 2008 | 17 May 2011 | British | 49 years |
| Jonathan Peter Morrish | Director | 1 Mar 2007 | 31 Oct 2007 | British | 56 years |
| Leslie Howard Unger | Director | 26 Mar 1999 | 17 Apr 2014 | British | 71 years |
| Mark Roger Atkinson | Director | 1 Sept 2014 | 31 Jan 2017 | British | 48 years |
| Michael Claude Menen | Director | 20 Jun 1991 | 11 Nov 1994 | British | 67 years |
| Michael Robert Teece | Director | 26 Mar 1999 | 10 May 2005 | British | 63 years |
| Patrick Joseph O'shea | Director | 1 Sept 2014 | 31 Dec 2015 | British | 68 years |
| Paul Derek Tunnacliffe | Secretary | 1 Mar 2007 | 31 Dec 2007 | British | - |
| Paul John Dewick | Director | 1 Mar 1996 | 31 Jul 2014 | British | 66 years |
| Phillip Keith Redmond | Director | 1 Sept 2012 | 1 Nov 2012 | British | 60 years |
| Richard Robert Gimmler | Director | 1 Mar 2007 | 16 Jun 2008 | British | 59 years |
| Robert Teece | Director | 20 Jun 1991 | 26 Mar 1999 | British | 87 years |
| Roger Thomas Virley Tyson | Secretary | 31 Jul 2008 | 10 Mar 2016 | British | - |
| Ronald Charles Whitlock | Director | 20 Jun 1991 | 26 Mar 1999 | British | 88 years |
| Seyda Pirinccioglu | Director | 19 Jul 2010 | 31 Aug 2013 | Turkish | 55 years |
| Stephen Richard Harrison | Director | 1 Mar 2007 | 4 Feb 2008 | British | 58 years |
| Stephen Richard Harrison | Director | 1 Mar 2014 | 1 Sept 2014 | British | 58 years |
| Wendy Jane Trott | Director | 1 Mar 2007 | 24 Dec 2008 | British | 60 years |