| Ailsa Zoya Longmuir | Director | 1 Oct 2021 | 26 Jun 2023 | British | 44 years |
| Alan Bennett | Director | 28 Apr 2005 | 31 Oct 2007 | British | 74 years |
| Alan Stewart Thompson | Director | 4 Jul 2007 | 28 Sept 2012 | British | 65 years |
| Anne Garrihy | Director | 25 Sept 1997 | 17 Jul 2001 | British | 66 years |
| Centrica Directors Limited | Corporate Director | 1 Nov 2001 | 27 Apr 2004 | United Kingdom | - |
| Christian Andrew Stella | Director | 3 Jun 2024 | 10 Oct 2025 | Italian,british | 45 years |
| Combined Nominees Limited | Corporate Nominee Director | 4 Nov 1996 | 25 Sept 1997 | United Kingdom | - |
| Combined Secretarial Services Limited | Corporate Nominee Director | 4 Nov 1996 | 25 Sept 1997 | United Kingdom | - |
| Combined Secretarial Services Limited | Corporate Nominee Secretary | 4 Nov 1996 | 25 Sept 1997 | United Kingdom | - |
| David Anthony James Crowther | Director | 16 Dec 2010 | 4 Apr 2012 | British | 64 years |
| Gearoid Martin Lane | Director | 27 Apr 2004 | 4 Jul 2007 | Irish | 62 years |
| Graeme Stuart Collinson | Director | 13 Feb 2009 | 1 Jan 2014 | British | 70 years |
| Gregory Alan Evans | Director | 18 Jun 2013 | 24 Mar 2014 | British | 69 years |
| Gregory Craig Mckenna | Director | 8 Mar 2021 | 3 Jun 2024 | British | 60 years |
| Ian Grant Dawson | Director | 25 Sept 1997 | 31 Jan 2000 | British | 67 years |
| Ian Ritchie | Director | 31 Jan 2000 | 1 Nov 2001 | British | 74 years |
| James Spence | Director | 31 Oct 2007 | 30 Jun 2010 | British New Zealand | 58 years |
| John Edward Knight | Director | 1 Jan 2014 | 24 Oct 2014 | British | 60 years |
| Jorge Pablo Pikunic | Director | 9 Dec 2019 | 8 Mar 2021 | British | 50 years |
| Lucy Elizabeth Caldwell | Director | 26 Jul 1999 | 1 Nov 2001 | British | 58 years |
| Lucy Elizabeth Caldwell | Secretary | 21 Nov 1997 | 9 Aug 2000 | British | - |
| Mark Ramsey Futyan | Director | 2 Nov 2016 | 9 Dec 2019 | British | 48 years |
| Mark Taylor | Director | 4 Oct 2016 | 30 Apr 2018 | British | 56 years |
| Michael Dennis | Director | 6 Nov 2019 | 7 May 2024 | British | 45 years |
| Michael John Garstang | Director | 27 Apr 2004 | 30 Jun 2008 | British | 78 years |
| Peter Frederick Leopold Koch De Gooreynd | Director | 2 Feb 2015 | 5 Sept 2016 | British | 68 years |
| Richard Matthew Mccord | Director | 4 Apr 2012 | 6 Nov 2019 | British | 53 years |
| Sarwjit Sambhi | Director | 27 Apr 2004 | 28 Apr 2005 | British | 57 years |
| Simon Patrick Redfern | Director | 26 Nov 2012 | 28 Feb 2017 | British | 61 years |
| Simon Richard Clark | Director | 27 Apr 2004 | 4 Jul 2007 | British | 62 years |
| Susan Elizabeth Wheeler | Director | 4 Jul 2007 | 16 Dec 2010 | British | 62 years |
| Terence Columba Murphy | Director | 24 Mar 2014 | 2 Nov 2016 | Irish | 62 years |
| Teresa Jane Furmston | Director | 25 Sept 1997 | 22 Feb 1999 | British | 59 years |
| Teresa Jane Furmston | Secretary | 25 Sept 1997 | 21 Nov 1997 | British | - |
| Thomas Edward Hinton | Director | 30 Jun 2010 | 15 Nov 2013 | British | 47 years |
| Tracy Lorraine Allen | Director | 18 Jul 2001 | 1 Nov 2001 | British | 60 years |