| Andrew James Timlin | Director | 29 Jun 2020 | 28 May 2021 | British | 49 years |
| Christopher Francis Henry Baker | Director | 14 Nov 2016 | 28 May 2021 | British | 71 years |
| Craig Hilton Rodgerson | Director | 1 Jan 2015 | 14 Nov 2016 | British | 62 years |
| David Alexander Baker | Director | 11 Sept 2006 | 30 Sept 2009 | British | 71 years |
| David Allan Thorpe | Director | 18 Apr 2006 | 29 May 2012 | British | 77 years |
| David Orlando Spencer Harmes | Secretary | 2 Feb 2007 | 30 Nov 2007 | British | - |
| Dipak Chandarana | Secretary | 16 Apr 2002 | 10 Dec 2003 | British | - |
| George B Gamble | Director | 16 Apr 2002 | 11 Mar 2005 | American | 68 years |
| Helen Turier | Director | 31 May 2002 | 16 Mar 2005 | British | 60 years |
| Hse Directors Limited | Corporate Director | 14 Mar 2002 | 16 Apr 2002 | - | - |
| Hse Secretaries Limited | Corporate Secretary | 14 Mar 2002 | 16 Apr 2002 | - | - |
| Iain Alexander Jamieson | Director | 1 Jul 2008 | 29 May 2012 | British | 60 years |
| Iain Alexander Jamieson | Secretary | 1 Jul 2008 | 29 May 2012 | British | - |
| James Cowan | Director | 26 Jan 2017 | 5 May 2023 | British | 52 years |
| James D'arcy Vincent | Director | 20 Jun 2014 | 1 Jan 2015 | British | 60 years |
| Jamie Leigh Radford | Director | 3 Sept 2015 | 1 Sept 2016 | British | 51 years |
| John Stevens | Director | 11 Mar 2005 | 31 Dec 2011 | British | 71 years |
| Marilla Carlyn Stevens | Secretary | 18 Nov 2004 | 2 Feb 2007 | British | - |
| Masson Yves | Director | 31 May 2002 | 11 Mar 2005 | French | 64 years |
| Michael Patrick Collier | Director | 1 Jan 2015 | 3 Sept 2015 | British | 51 years |
| Nicolas Norman Bedford | Director | 11 Jul 2014 | 1 Jan 2015 | British | 67 years |
| Paul Raymond Champion | Director | 5 Nov 2009 | 6 Jun 2011 | British | 60 years |
| Peter Mark Franklin | Director | 28 Mar 2014 | 11 Jul 2014 | British | 50 years |
| Richard John Shearer | Director | 29 May 2012 | 28 Mar 2014 | British | 62 years |
| Robert Thompson | Director | 31 May 2002 | 18 Apr 2006 | British | 69 years |
| Robert Thompson | Secretary | 10 Dec 2003 | 18 Nov 2004 | British | - |
| Sean Alfred Massey | Director | 29 May 2012 | 14 Feb 2013 | British | 56 years |
| Sean Alfred Massey | Director | 1 Jan 2015 | 27 Sept 2017 | British | 56 years |
| Shaun Robert Hopgood | Director | 11 Mar 2005 | 29 May 2012 | British | 60 years |
| Simon Charles Chipperfield | Director | 14 Feb 2013 | 20 Jun 2014 | British | 62 years |
| Stefan John Maynard | Director | 1 Jan 2015 | 29 Jun 2020 | British | 54 years |
| Trevor Francis Wilkinson | Director | 16 Apr 2002 | 11 Mar 2005 | British | 85 years |
| William Stephen Mcbrinn | Director | 1 Sept 2016 | 28 Feb 2017 | British | 58 years |
| Xavier Andre Bernard Flinois | Director | 1 Oct 2009 | 29 May 2012 | French | 64 years |