| Amanda Jane King | Director | 13 Jan 2011 | 16 Dec 2011 | British | 57 years |
| Andrew Matthews | Director | 1 Feb 2024 | 30 Sept 2025 | British | 56 years |
| Anne Elizabeth Minto | Director | 28 Apr 2009 | 25 Jun 2010 | British | 73 years |
| Catherine Jane Aldwinckle | Director | 25 Jul 2005 | 31 Jul 2011 | British | 60 years |
| Centrica Directors Limited | Corporate Director | 24 May 2005 | 25 May 2005 | United Kingdom | - |
| Colin George Moore | Director | 28 Feb 2012 | 28 Feb 2017 | British | 81 years |
| David James Brand | Director | 17 Mar 2017 | 6 Mar 2018 | British | 56 years |
| David John Colin Flower | Director | 25 May 2005 | 11 Sept 2006 | British | 70 years |
| David John House | Director | 15 Dec 2011 | 29 Feb 2024 | British | 57 years |
| Gary Mcintosh | Director | 13 Dec 2021 | 16 Feb 2024 | British | 45 years |
| Graeme Stuart Collinson | Director | 26 May 2009 | 5 Nov 2013 | British | 70 years |
| John Arthur Kevin Clark | Director | 6 Jun 2005 | 13 Jan 2011 | British | 73 years |
| Kenneth Michael Anidjar Main | Director | 20 Jan 2012 | 19 Feb 2016 | British | 51 years |
| Lisa Glenys Micallef | Director | 1 Oct 2020 | 31 Mar 2023 | British | 52 years |
| Marc Anthony Angell | Director | 19 Feb 2016 | 9 Aug 2017 | British | 46 years |
| Martyn John Faulkner Davidson | Director | 1 Nov 2006 | 26 May 2009 | British | 72 years |
| Martyn Rhys Espley | Director | 9 Aug 2017 | 1 May 2024 | British | 49 years |
| Michael William New | Director | 25 May 2005 | 25 Jul 2005 | British | 78 years |
| Ramila Barnett | Director | 1 Jun 2020 | 30 Jun 2021 | British | 63 years |
| Richard Paul Peatfield | Director | 13 Feb 2013 | 30 Jun 2017 | British | 65 years |
| Sandra Hilda Dyball | Director | 1 Jul 2024 | 30 Jun 2025 | British | 55 years |
| Simon Marc Wills | Director | 5 Nov 2013 | 11 Jun 2020 | British | 59 years |
| Vishall Yaspal Buldawoo | Director | 1 Dec 2021 | 30 Jun 2024 | British | 41 years |
