| Adam Charles Greenslade | Director | 1 Jul 2020 | 15 Dec 2020 | British | 45 years |
| Alan Paul Raymant | Director | 4 Nov 2002 | 2 Dec 2003 | British | 63 years |
| Andrew David Corbyn | Director | 22 Sept 2014 | 16 Jun 2017 | British | 43 years |
| Andrew Vaudin | Director | 7 Jan 2003 | 26 Sept 2003 | British | 65 years |
| Anthony Kay | Director | 1 Jul 1992 | 26 Aug 1992 | British | 79 years |
| Chantal Thomas | Secretary | 20 Jun 2001 | 14 May 2002 | British | - |
| Christopher William Morris | Director | 9 Feb 1999 | 30 Jun 2003 | British | 79 years |
| Daniel Steven Shaw | Director | 31 Jan 2007 | 1 Mar 2017 | British | 68 years |
| E.on Uk Secretaries Limited | Corporate Secretary | 11 Mar 2014 | 24 Feb 2017 | United Kingdom | - |
| Edwin John Wilkinson | Director | 5 Aug 2005 | 25 Mar 2011 | British | 61 years |
| Edwin John Wilkinson | Director | 16 Jun 2017 | 1 Mar 2021 | British | 61 years |
| Emma Trevis | Secretary | 12 Jul 2007 | 1 Aug 2008 | British | - |
| Euan Thomas Mcgregor | Director | 1 Jul 1992 | 1 Nov 1994 | British | 68 years |
| Gary Alan Coombs | Director | 25 Mar 2011 | 16 Jun 2017 | British | 67 years |
| Ian Andrew Kay | Director | 14 Mar 2005 | 5 Aug 2005 | British | 67 years |
| Ian Douglas Everard | Director | 16 Feb 1998 | 7 Jan 2003 | British | 67 years |
| Ian Graham Knight | Director | 26 Aug 1992 | 16 Mar 1995 | British | 75 years |
| Ian Graham Knight | Director | 23 Feb 1993 | 1 Jul 1993 | British | 75 years |
| Ian Graham Knight | Director | 20 Mar 1995 | 29 Aug 2001 | British | 75 years |
| Ian Peter Fairclough | Secretary | 16 Mar 2000 | 26 Jun 2001 | British | - |
| Ian Peter Fairclough | Secretary | 14 May 2002 | 12 Jul 2007 | British | - |
| Ivan Keith Adams | Director | 1 Jul 1992 | 12 Oct 1994 | British | 83 years |
| James Henry Newman | Director | 29 Aug 2001 | 7 May 2002 | British | 76 years |
| Jason Scagell | Director | 2 Dec 2003 | 31 Jan 2007 | British | 59 years |
| Jeremy David Thirsk | Director | 26 Sept 2003 | 5 Jul 2004 | British | 66 years |
| John Graham Cole | Director | 9 Jun 1997 | 11 Jun 1998 | British | 71 years |
| John Graham Cole | Director | 25 Jan 2006 | 22 Sept 2014 | British | 71 years |
| Jonathan Simon Lloyd | Director | 29 Jun 1993 | 30 Sept 1994 | British | 70 years |
| Karen Sarah Macnaughton | Secretary | 1 Aug 2008 | 11 Mar 2014 | British | - |
| Keith Eddington | Director | 19 Sept 1996 | 29 May 1998 | British | 80 years |
| Malcolm David Chilton | Director | 7 May 2002 | 26 Sept 2003 | British | 74 years |
| Mark Lindsay Bygraves | Secretary | 9 Feb 1999 | 16 Mar 2000 | British | - |
| Mark Nicholas John Hope | Director | 16 Mar 1995 | 31 Dec 1997 | British | 70 years |
| Martin Stephen William Stanley | Director | 14 Mar 2005 | 25 Jan 2006 | British | 63 years |
| Natalia Paraskevopoulou | Director | 16 Jun 2017 | 29 Jun 2018 | Greek | 43 years |
| Nigel David Wynne Taunt | Director | 1 Jul 1993 | 16 Mar 1995 | British | 73 years |
| Pario Limited | Corporate Secretary | 24 Feb 2017 | 21 May 2021 | United Kingdom | - |
| Paul Anthony | Director | 26 Sept 2003 | 14 Mar 2005 | British | 71 years |
| Paul Clifford Skertchly | Director | 5 Jul 2004 | 14 Mar 2005 | British | 64 years |
| Paul John Webster | Director | 12 Sept 2001 | 4 Nov 2002 | British | 71 years |
| Paul John Webster | Director | 30 Jun 2003 | 22 Jun 2012 | British | 71 years |
| Paul Mulvihill | Director | 1 Oct 2012 | 30 Jun 2016 | British | 67 years |
| Peter Edward Dias | Director | 29 Jun 2018 | 1 Mar 2021 | British | 45 years |
| Philip Bryan Morgan | Director | 6 Aug 1990 | 13 Feb 1992 | British | 83 years |
| Roland Sven Walter Flaig | Director | 1 Jul 2016 | 15 Dec 2020 | Swedish | 52 years |
| Sarah Marie Davenport Christie | Secretary | 19 Sept 1996 | 15 Dec 1997 | British | - |
| Simon David Moglia | Director | 26 Aug 1998 | 9 Feb 1999 | British | 64 years |
| Stephen Bottomley | Director | 30 Sept 1994 | 8 Jan 1997 | British | 79 years |
| Stephen David Guy | Director | 11 Jun 1998 | 9 Feb 1999 | British | 77 years |
| Stephen Edmund Foster | Director | 9 Feb 1999 | 12 Sept 2001 | British | 63 years |
| Steven Binks | Director | 3 Oct 1994 | 16 Dec 1997 | British | 73 years |
| Susan Margaret Johansson | Secretary | 1 Jul 1992 | 19 Sept 1996 | British | - |
| Susan Margaret Johansson | Secretary | 15 Dec 1997 | 30 Oct 1998 | British | - |
| Timothy James Bell | Director | 1 Mar 2017 | 30 Jun 2020 | British | 53 years |
| Vivian George Harper | Director | 1 Jul 1992 | 29 Jun 1993 | British | 84 years |
| William John Wilkinson | Director | 3 Oct 1994 | 19 Sept 1996 | British | 80 years |