| Alan Henry Haywood | Director | 1 Nov 2014 | 1 Feb 2017 | British | 60 years |
| Aleida Garza Rios | Director | 19 Mar 2018 | 29 Aug 2021 | American | 58 years |
| Andrea Margaret Thomas | Secretary | 1 Sept 1997 | 17 Feb 2003 | Other | - |
| Andrea Margaret Thomas | Secretary | 21 Jul 2008 | 23 Mar 2009 | Other | - |
| Anthony Bryan Hayward | Director | 1 Sept 2000 | 1 Nov 2002 | British | 69 years |
| Brian Peevor | Secretary | 9 Feb 1994 | 31 Aug 1997 | British | - |
| Byron Elmer Grote | Director | 1 May 2003 | 1 Nov 2003 | British And Us Citizen | 78 years |
| Carol-lee Howle | Director | 1 Feb 2018 | 1 Aug 2020 | British | 54 years |
| Christopher John Field | Director | 30 May 1992 | 30 May 1994 | British | 78 years |
| Christopher Kuangcheng Gerald Eng | Secretary | 23 Mar 2009 | 30 Jun 2010 | Other | - |
| Chunming Zhao | Director | 30 Aug 2016 | 1 Jul 2020 | Chinese | 60 years |
| David Andrew James Baldry | Director | 1 Sept 2006 | 1 Dec 2008 | British | 71 years |
| David Hugh Walton Payne | Director | 1 Jul 1993 | 1 Dec 1997 | British | 84 years |
| David James Bucknall | Director | 1 Jan 2012 | 1 Nov 2014 | British | 58 years |
| David Michael Lane | Director | 1 Mar 2024 | 1 Sept 2025 | British | 61 years |
| David Robert Watson | Director | 1 Mar 1999 | 1 Sept 2000 | British | 74 years |
| David Stephen Fitzsimmons | Director | 1 Mar 1999 | 1 Oct 1999 | British | 71 years |
| Dawn Noel | Secretary | 1 Feb 2006 | 3 Nov 2006 | British | - |
| Debasish Satya Sanyal | Director | 1 Aug 2007 | 1 Jan 2012 | British | 61 years |
| Dominic Wood | Director | 30 Aug 2016 | 20 Apr 2017 | British | 50 years |
| Donald John Ridgway | Director | 13 Nov 2007 | 1 May 2015 | British | 72 years |
| Douglas Patrick Chapman | Director | 1 Nov 2002 | 31 Jul 2007 | British | 76 years |
| Francis William Michael Starkie | Director | 29 Mar 2006 | 22 May 2006 | British | 77 years |
| Gillian Elizabeth Young | Secretary | 30 May 1992 | 9 Feb 1994 | British | - |
| Janet Elvidge | Secretary | 3 Nov 2006 | 21 Jul 2008 | Other | - |
| Jenny Webster | Director | 15 Mar 2021 | 28 Jan 2022 | British | 42 years |
| John Mogford | Director | 13 Nov 2007 | 1 Mar 2008 | British | 73 years |
| Jonathan Richard O'sullivan | Director | 5 Oct 2020 | 15 Mar 2021 | British | 43 years |
| Katherine Anne Thomson | Director | 1 Feb 2017 | 27 Aug 2019 | British | 58 years |
| Leslie Atkinson | Director | 30 May 1992 | 1 Jul 1993 | British | 82 years |
| Linda Louise Adamany | Director | 1 Oct 1999 | 1 Dec 2002 | American | 74 years |
| Melrose Oil Trading Company Limited | Corporate Director | 13 Aug 2004 | 7 Oct 2004 | United Kingdom | - |
| Nicholas Hartley | Director | 30 May 1992 | 30 May 1993 | British | 89 years |
| Peter George Backhouse | Director | 8 Dec 1997 | 1 Mar 1999 | British | 75 years |
| Richard Leon Paniguian | Director | 1 Jan 1995 | 13 Nov 2007 | British | 77 years |
| Richard Wheatley | Director | 27 Aug 2019 | 13 Oct 2022 | British | 53 years |
| Richard William Newton | Director | 30 May 1992 | 30 May 1994 | British | 81 years |
| Robert Allen Malone | Director | 1 Dec 2002 | 1 Sept 2006 | Us Citizen | 74 years |
| Robert James Day | Director | 1 Feb 2009 | 29 Apr 2016 | British | 67 years |
| Robert John Harrison | Director | 14 Jul 2017 | 14 Mar 2018 | British | 62 years |
| Roderick Guy Mason | Director | 29 Apr 2016 | 3 Nov 2020 | British | 62 years |
| Susan Diane Kolbush | Director | 1 Aug 2020 | 1 Mar 2024 | American | 60 years |
| Susan Leslie Dio | Director | 1 May 2015 | 31 Jan 2018 | American | 65 years |
| Sven Roger Boss-walker | Director | 7 Sept 2020 | 16 Nov 2021 | Australian | 49 years |
| Vivienne Cox | Director | 1 Apr 2002 | 13 Nov 2007 | British | 67 years |
| William James Luff | Director | 30 May 1992 | 31 Dec 1994 | New Zealander | 76 years |
| Yasin Stanley Ali | Secretary | 17 Feb 2003 | 1 Feb 2006 | Other | - |
