| Adam Charles Greenslade | Director | 1 Mar 2017 | 1 Oct 2023 | British | 45 years |
| Alasdair James Dougall Locke | Director | 31 Dec 1998 | 18 Oct 2002 | British | 73 years |
| Alfred Roberts | Director | 30 Mar 1994 | 19 Sept 1997 | British | 81 years |
| Anthony David Cocker | Director | 16 Jul 2001 | 13 Sept 2001 | British | 67 years |
| Benjamin James Freeman | Director | 1 Jul 2020 | 30 Apr 2022 | British | 49 years |
| Carol Wood | Director | 31 Dec 1998 | 1 Jan 2002 | British | 72 years |
| Chantal Thomas | Secretary | 21 May 2001 | 1 Jul 2002 | British | - |
| Daniel Steven Shaw | Director | 19 Dec 2006 | 16 May 2007 | British | 68 years |
| Daniel Steven Shaw | Director | 30 Nov 2012 | 1 Mar 2017 | British | 68 years |
| David Allen Farrier | Director | 19 Dec 2006 | 16 May 2007 | British | 76 years |
| David John Jackson | Director | 2 Mar 1993 | 22 Dec 1998 | British | 73 years |
| David John Jackson | Secretary | 2 Mar 1993 | 8 Jan 1998 | British | - |
| E.on Uk Secretaries Limited | Corporate Secretary | 20 Sept 2012 | 30 Sept 2019 | United Kingdom | - |
| Fiona Scott Stark | Director | 1 Jul 2002 | 19 Dec 2006 | British | 64 years |
| Ian Peter Fairclough | Secretary | 17 May 2000 | 21 May 2001 | British | - |
| Ian Peter Fairclough | Secretary | 1 Jul 2002 | 13 Jul 2012 | British | - |
| Jason Scagell | Director | 31 Mar 2004 | 19 Dec 2006 | British | 59 years |
| Jonathan Mark Henderson | Director | 28 Feb 2022 | 22 Mar 2024 | British | 45 years |
| Keith Plowman | Director | 19 Dec 2006 | 16 May 2007 | British | 68 years |
| Kevin John Yorath | Director | 16 May 2007 | 1 Jan 2008 | English | 66 years |
| Mark Lindsay Bygraves | Secretary | 8 Jan 1998 | 17 May 2000 | British | - |
| Mark Robert Draper | Director | 13 Sept 2001 | 31 Mar 2004 | British | 63 years |
| Michael John Lawrence Salter | Director | 31 Dec 1998 | 18 Oct 2002 | British | 79 years |
| Nia Ann Griffiths | Director | 1 Oct 2023 | 22 Mar 2024 | Welsh | 37 years |
| Nicholas Peter Baldwin | Director | 19 Sept 1997 | 22 Dec 1998 | British | 74 years |
| Paul John Webster | Director | 16 May 2007 | 22 Jun 2012 | British | 71 years |
| Paul Mulvihill | Director | 30 Nov 2012 | 30 Jun 2016 | British | 67 years |
| Penelope Anne Sainsbury | Secretary | 1 Jul 2020 | 1 May 2024 | - | - |
| Peter Haldane Melville-smith | Director | 2 Mar 1993 | 30 Mar 1994 | British | 79 years |
| Rene Blokhuizen | Director | 9 Apr 2014 | 6 May 2014 | Dutch | 56 years |
| Robert John Kennett | Director | 31 Oct 1996 | 16 Jul 2001 | British | 76 years |
| Rodney George Barber | Director | 9 Jan 1997 | 22 Dec 1998 | British | 80 years |
| Roland Sven Walter Flaig | Director | 1 Jul 2016 | 30 Jun 2020 | Swedish | 52 years |
| Terence Edward Chappell | Director | 31 Oct 1996 | 22 Dec 1998 | British | 84 years |
| Timothy James Bell | Director | 1 Jul 2016 | 30 Jun 2020 | British | 53 years |
| Vian Robert Davys | Director | 1 Jan 2008 | 10 Dec 2012 | British | 58 years |