| Anthony Jeremy Conway | Director | 16 Aug 2011 | 24 Sept 2014 | British | 70 years |
| Christopher John Brook | Director | 4 Jan 2005 | 9 Apr 2008 | British | 67 years |
| Colin James Timothy Davis | Director | 4 Aug 2010 | 16 Aug 2011 | British | 61 years |
| David Mark Hannon | Director | 25 Feb 2011 | 5 Dec 2023 | British | 50 years |
| Douglas William Coleman | Director | 21 Jul 2003 | 4 Jan 2005 | British | 74 years |
| Frederick Mcarthur | Director | 21 Jul 2003 | 30 Nov 2005 | British | 70 years |
| Gordon Arthur Ivan Waters | Director | 21 Jul 2003 | 23 Jun 2006 | British | 79 years |
| Helen Julia Samuels | Director | 20 Aug 2014 | 31 Oct 2016 | British | 56 years |
| Ian John Alexander Plenderleith | Director | 9 Apr 2008 | 22 Aug 2014 | British | 63 years |
| Jeremy Paul Salisbury | Director | 20 Aug 2014 | 31 May 2018 | British | 54 years |
| Joanne Iddon | Director | 23 Jun 2006 | 19 Oct 2007 | British | 57 years |
| John Francis Dolan | Director | 21 Jul 2003 | 4 Aug 2010 | British | 76 years |
| John Hart | Director | 19 Oct 2007 | 22 Jul 2009 | British | 74 years |
| John Lee Chappell | Director | 30 Sept 2017 | 19 Oct 2019 | British | 55 years |
| Jonathan Andrew Hodgkin | Director | 20 Aug 2014 | 30 Sept 2017 | British | 65 years |
| Kevin Dewhurst | Director | 9 Jul 2007 | 4 Jun 2009 | British | 59 years |
| Mark Andrew Wilson | Director | 4 Aug 2010 | 16 Aug 2011 | British | 58 years |
| Martin Anthony Gee | Director | 14 Aug 2017 | 31 Mar 2021 | British | 49 years |
| Martin Padley | Director | 19 Oct 2019 | 31 Dec 2020 | British | 60 years |
| Matthew Reginald Wright | Director | 9 Jul 2007 | 25 Feb 2011 | British | 61 years |
| Neil Gillespie | Director | 20 Aug 2014 | 24 Sept 2014 | British | 58 years |
| Neil James Colman | Director | 4 Aug 2010 | 14 Aug 2017 | British | 63 years |
| Paul Donald Briggs | Director | 1 Dec 2005 | 9 Jul 2007 | British | 65 years |
| Paula Marie Steer | Director | 2 Mar 2020 | 30 Jun 2023 | British | 56 years |
| Stephen Craig Edge | Director | 8 Sept 2006 | 18 Apr 2007 | British | 66 years |
| Stephen Edward Rogers | Director | 21 Jul 2003 | 4 Jan 2005 | New Zealander | 66 years |
| Stephen Johnson | Director | 4 Jan 2005 | 8 Sept 2006 | British | 66 years |
| Steven Paul Walsh | Director | 16 Aug 2011 | 1 Aug 2014 | British | 65 years |
| Steven Richard Fraser | Director | 18 Apr 2007 | 9 Jul 2007 | British | 51 years |
| Uu Secretariat Limited | Corporate Director | 19 Oct 2019 | 2 Mar 2020 | United Kingdom | - |