| Anthony David Cocker | Director | 31 Mar 2004 | 4 Jul 2007 | British | 67 years |
| Bernd Wagner | Director | 8 Dec 2017 | 31 Oct 2018 | German | 60 years |
| Caroline Louise Farbridge | Secretary | 29 Apr 1994 | 28 Sept 1994 | British | - |
| Chantal Benedicte Forrest | Secretary | 30 Sept 1993 | 29 Apr 1994 | British | - |
| Christopher James Lovatt | Director | 18 Sept 2020 | 31 Jan 2025 | British | 57 years |
| Colin Roger Scoins | Director | 1 Jan 2008 | 17 May 2010 | British | 71 years |
| David John Jackson | Director | 31 Dec 1998 | 1 Jul 2002 | British | 73 years |
| David John Morgans | Director | 1 Jan 2008 | 7 Jan 2013 | British | 56 years |
| David Robert Newitt | Director | 3 Mar 2021 | 28 Jun 2024 | British | 58 years |
| Donald Bunce | Director | 1 Apr 1993 | 29 Apr 1994 | British | 77 years |
| Donald Leiper | Director | 7 Jan 2013 | 28 Jan 2016 | British | 62 years |
| E.on Uk Secretaries Limited | Corporate Secretary | 7 Jan 2013 | 26 Sept 2022 | United Kingdom | - |
| Elaine Phillippa Delamer House | Secretary | 28 Sept 1994 | 10 Mar 1995 | British | - |
| Euan Thomas Mcgregor | Director | 1 Apr 1993 | 31 Aug 1994 | British | 68 years |
| Fiona Scott Stark | Secretary | 13 Dec 1999 | 17 Apr 2000 | British | - |
| Graham John Bartlett | Director | 15 Jan 2001 | 4 Jul 2007 | British | 70 years |
| Graham Joseph Hall | Director | 29 Apr 1994 | 31 Aug 1994 | British | 83 years |
| Graham Joseph Hall | Director | 1 Apr 1997 | 31 Dec 1998 | British | 83 years |
| Ian Peter Fairclough | Secretary | 17 Apr 2000 | 13 Jul 2012 | British | - |
| Ivan Keith Adams | Director | 1 Apr 1993 | 31 Aug 1994 | British | 83 years |
| James Timothy Lightfoot | Director | 17 May 2010 | 7 Jan 2013 | British | 60 years |
| James Timothy Lightfoot | Director | 28 Jan 2016 | 8 Dec 2017 | British | 60 years |
| John Anthony Ireton | Director | 22 Aug 2016 | 23 Mar 2018 | British | 57 years |
| John Malcolm Chatwin | Director | 24 Jun 1996 | 22 Jul 1996 | British | 81 years |
| John Malcolm Chatwin | Director | 12 Nov 1996 | 1 Apr 1997 | British | 81 years |
| John Robert Heath | Director | 1 Oct 1994 | 22 Jul 1996 | British | 75 years |
| Keith Eddington | Director | 3 Jun 1996 | 29 May 1998 | British | 80 years |
| Keith Plowman | Director | 5 Mar 2002 | 1 Jan 2008 | British | 68 years |
| Mark Lindsay Bygraves | Secretary | 31 Dec 1998 | 13 Dec 1999 | British | - |
| Mark Robert Draper | Director | 5 Mar 2002 | 31 Mar 2004 | British | 63 years |
| Michael Geoffrey Wake | Director | 22 Aug 2016 | 27 Feb 2024 | British | 56 years |
| Michael Robert Day | Director | 4 Apr 2018 | 29 Nov 2019 | British | 48 years |
| Michael Robert French | Director | 1 Nov 2018 | 18 Sept 2020 | German | 58 years |
| Nicholas Peter Baldwin | Director | 29 Jun 1999 | 1 Jul 2002 | British | 74 years |
| Nigel Paul Dewbery | Director | 3 Mar 2021 | 1 Feb 2022 | British | 65 years |
| Peter Jeremy Bridgewater | Director | 4 Jul 2007 | 1 Jan 2008 | British | 63 years |
| Philip Bryan Morgan | Director | 22 Jul 1996 | 8 Nov 1996 | British | 83 years |
| René Matthies | Director | 7 Jan 2013 | 31 May 2016 | German | 56 years |
| Richard James Pennells | Director | 7 Jan 2013 | 18 May 2016 | British | 62 years |
| Robert James Skerrett | Director | 1 Apr 1993 | 29 Apr 1994 | British | 85 years |
| Robert John Kennett | Director | 31 Dec 1998 | 5 Mar 2002 | British | 76 years |
| Robert Keith Moorhouse | Secretary | 12 May 1997 | 2 Jun 1997 | British | - |
| Robert Taylor | Director | 4 Jul 2007 | 1 Oct 2008 | British | 65 years |
| Rodney George Barber | Director | 29 Jun 1999 | 10 Jan 2001 | British | 80 years |
| Roger Dickinson | Director | 13 Jul 1992 | 1 Apr 1993 | British | 80 years |
| Roger Dyson | Secretary | 13 Jul 1992 | 30 Sept 1993 | British | - |
| Russell Andrew Strothers | Director | 29 Nov 2019 | 19 Mar 2020 | British | 40 years |
| Sarah Louise Farmer | Director | 1 Feb 2022 | 31 Dec 2023 | British | 42 years |
| Sarah Marie Davenport Christie | Secretary | 8 Sept 1998 | 31 Dec 1998 | British | - |
| Simon Leon Duncan | Director | 27 Feb 2024 | 30 Apr 2025 | British | 44 years |
| Stephen David Guy | Director | 11 Jun 1998 | 31 Dec 1998 | British | 77 years |
| Susan Margaret Johansson | Secretary | 1 Dec 1997 | 8 Sept 1998 | British | - |
| Terence Edward Chappell | Director | 29 Jun 1999 | 14 Jan 2002 | British | 84 years |
| Thomas John Morris | Director | 24 Jun 1996 | 31 Dec 1998 | British | 80 years |
| William John Wilkinson | Director | 29 Apr 1994 | 22 Jul 1996 | British | 80 years |