| Adrian Williamson | Director | 30 Sept 2004 | 25 Jul 2006 | British | 68 years |
| Alison Claire Robinson | Director | 15 Jan 2015 | 31 Oct 2015 | British | 59 years |
| Andrew Quail | Director | 14 Dec 1994 | 3 Jun 1998 | British | 79 years |
| Centrica Secretaries Limited | Corporate Secretary | 30 Sept 2004 | 1 Jul 2013 | United Kingdom | - |
| Christopher John Stern | Director | 13 Jul 2005 | 17 Apr 2012 | English | 69 years |
| Christopher Phillip Anthony Weston | Director | 13 Jul 2005 | 5 May 2009 | British | 62 years |
| Claire Helen Conolly | Director | 14 Nov 2016 | 26 Mar 2021 | British | 51 years |
| Clive Robert Smith | Director | 1 Dec 1992 | 30 Sept 2004 | British | 68 years |
| Daniel Peter Ratcliffe | Director | 16 Jul 2012 | 5 Jul 2013 | British | 45 years |
| David Mel Zuydam | Director | 28 Feb 2014 | 16 May 2014 | British | 65 years |
| David William Elliot Alexander | Director | 17 Apr 2012 | 5 Jul 2013 | British | 65 years |
| David William Walter | Director | 26 Nov 2009 | 19 Dec 2011 | British | 50 years |
| Duncan Smith | Director | 6 May 2021 | 12 Sept 2023 | British | 55 years |
| George Thomas Oatham | Secretary | 14 Jun 1991 | 30 Sept 2004 | British | - |
| Ian Peters | Director | 30 Sept 2004 | 13 Jul 2005 | British | 68 years |
| Ian Peters | Director | 20 Apr 2009 | 26 Nov 2009 | British | 68 years |
| Ian Vincent Cusden | Secretary | 28 Dec 2016 | 23 Dec 2019 | - | - |
| Ilaria Evans | Secretary | 15 Sept 2022 | 20 Nov 2023 | - | - |
| James Francis Zockoll | Director | 14 Jun 1991 | 30 Sept 2004 | American | 96 years |
| James Michael Arnold | Director | 28 Dec 2016 | 1 Jan 2023 | British | 61 years |
| James Robert Winnicott | Director | 28 Dec 2016 | 28 Feb 2023 | British | 58 years |
| John Bernard Chaplin | Director | 14 Jun 1991 | 31 Mar 2000 | British | 78 years |
| Julian Alexander Roger Knott | Director | 2 Jul 2007 | 31 Dec 2007 | British | 69 years |
| Julian Mark Hartley | Director | 16 May 2014 | 28 Dec 2016 | British | 65 years |
| Kamini Challis | Director | 15 Nov 2013 | 28 Feb 2014 | British | 56 years |
| Martin Geoffrey Beesley | Director | 28 Dec 2016 | 22 Oct 2021 | British | 60 years |
| Michael Alan Sussex Langford | Director | 1 Mar 2000 | 12 Nov 2002 | British | 68 years |
| Michael Anthony Cowler | Director | 14 Jun 1991 | 3 Aug 1992 | British | 82 years |
| Naznina Bhatia | Director | 7 Jul 2010 | 1 Oct 2012 | British | 61 years |
| Oliver Mark Smedley | Director | 13 Sept 2010 | 16 Jul 2012 | British | 56 years |
| Oliver Mark Smedley | Director | 1 Oct 2012 | 5 Jul 2013 | British | 56 years |
| Peter Neden | Director | 28 Feb 2014 | 15 Jan 2015 | British | 58 years |
| Richard Ozsanlav | Director | 26 Nov 2009 | 13 Sept 2010 | British | 57 years |
| Thomas Carmichael Hampson Mciver | Director | 5 Jul 2013 | 15 Nov 2013 | British | 69 years |
| Toby James Bailey Siddall | Director | 31 Dec 2007 | 7 Jul 2010 | British | 55 years |
| Vaishali Patel | Secretary | 5 Jul 2013 | 28 Dec 2016 | British | - |
| William James Cooper | Secretary | 23 Dec 2019 | 15 Sept 2022 | - | - |