| Alastair James Watson | Director | 9 May 2016 | 1 Oct 2018 | British | 52 years |
| Andrea Finegan | Director | 29 Jul 2005 | 27 Nov 2007 | German | 57 years |
| Brian Mervyn Semple | Director | 10 Jul 2012 | 26 Oct 2015 | British | 80 years |
| Brian Mervyn Semple | Director | 26 Oct 2015 | 9 May 2016 | British | 80 years |
| Christopher John Blundell | Director | 11 Nov 2008 | 7 Sept 2009 | British | 60 years |
| Christopher John Blundell | Director | 7 Sept 2009 | 9 Nov 2009 | British | 60 years |
| Christopher John Blundell | Director | 9 Nov 2009 | 19 Jul 2010 | British | 60 years |
| Christopher John Blundell | Director | 19 Jul 2010 | 24 Apr 2017 | British | 60 years |
| David Francis Lindesay | Director | 4 Mar 2008 | 11 Nov 2008 | British | 66 years |
| David Francis Lindesay | Director | 24 Apr 2017 | 26 Jun 2019 | British | 66 years |
| Graham Maurice Beazley-long | Director | 9 Sept 2008 | 26 Oct 2015 | British | 66 years |
| Ian David Hudson | Director | 1 May 2008 | 9 Sept 2008 | British | 62 years |
| Ian David Hudson | Director | 9 Sept 2008 | 20 Jan 2012 | British | 62 years |
| Ian Richard Gethin | Director | 22 Dec 2005 | 4 Mar 2008 | British | 55 years |
| Ian Richard Gethin | Director | 6 Feb 2013 | 13 Jan 2014 | British | 55 years |
| James William Ward | Director | 1 Apr 2005 | 9 Sept 2008 | British | 74 years |
| John Graham | Director | 26 Oct 2015 | 23 May 2018 | British | 73 years |
| John Wickerson | Director | 22 Jan 2004 | 30 Sept 2014 | British | 89 years |
| Kim Michele Clear | Director | 19 Jul 2010 | 6 Feb 2013 | British | 51 years |
| Louis Javier Falero | Director | 31 Dec 2022 | 12 May 2025 | British | 49 years |
| Matthew James Webber | Director | 22 Jan 2004 | 28 Jul 2005 | British | 63 years |
| Nicholas John Edward Crowther | Director | 8 Jan 2008 | 1 May 2008 | British | 66 years |
| Paul Alan Bannister | Director | 11 Mar 2004 | 28 Mar 2007 | United Kingdom | 67 years |
| Phillip Joseph Dodd | Director | 3 Sept 2020 | 31 Dec 2022 | British | 71 years |
| Richard Little | Director | 13 Jan 2014 | 24 Apr 2017 | British | 47 years |
| Richard Little | Director | 24 Apr 2017 | 24 Sept 2020 | British | 47 years |
| Robert Hugh Corrie Rees | Director | 22 Dec 2005 | 7 Sept 2009 | British | 65 years |
| Stephen Paul Hornby | Director | 7 Sept 2009 | 9 Nov 2009 | British | 69 years |
| Stephen Robert Sams | Director | 22 Jan 2004 | 11 Mar 2004 | British | 70 years |
| Terence Ryan | Director | 9 Nov 2009 | 19 Jul 2010 | British | 69 years |