| Aderemi Ladega | Secretary | 11 Apr 2005 | 30 Jun 2010 | British | - |
| Alan Henry Haywood | Director | 1 Apr 2010 | 10 Dec 2014 | British | 60 years |
| Alan Henry Haywood | Director | 20 Feb 2017 | 31 Mar 2020 | British | 60 years |
| Andrea Margaret Thomas | Secretary | 1 Sept 1997 | 1 Oct 2003 | Other | - |
| Andrea Margaret Thomas | Secretary | 1 Aug 2004 | 11 Apr 2005 | Other | - |
| Barry Alexander English | Secretary | 28 Sept 1991 | 31 Jan 1995 | British | - |
| Brian Gilvary | Director | 1 Apr 2005 | 31 Dec 2009 | British | 64 years |
| Brian Michael Puffer | Director | 1 Jan 2018 | 1 Feb 2024 | British,american | 57 years |
| Brian Peevor | Secretary | 1 Feb 1995 | 31 Aug 1997 | British | - |
| Carey Jude Mendes | Director | 1 Jan 2012 | 2 Nov 2015 | Canadian | 58 years |
| Carol-lee Howle | Director | 5 Nov 2018 | 16 Jul 2020 | British | 54 years |
| Caryn Ryan | Director | 1 Feb 1999 | 1 May 2002 | Us Citizen | 69 years |
| Christopher George Burley | Director | 28 Sept 1991 | 31 Jan 1995 | British | 83 years |
| Christopher John Moorhouse | Director | 16 Jan 1998 | 1 Dec 2001 | British | 74 years |
| Christopher Kuangcheng Gerald Eng | Secretary | 23 Mar 2009 | 30 Jun 2010 | - | - |
| David James Bucknall | Director | 10 Dec 2014 | 1 Jan 2018 | British | 58 years |
| David James Bucknall | Director | 16 Jul 2020 | 30 Sept 2021 | British | 58 years |
| David Stephen Fitzsimmons | Director | 1 Aug 1996 | 31 Aug 1997 | British | 71 years |
| David William Knipe | Director | 16 Dec 2010 | 1 Jan 2012 | British | 52 years |
| Douglas Patrick Chapman | Director | 27 Mar 1996 | 31 Jul 1996 | British | 76 years |
| Francis William Michael Starkie | Director | 1 Feb 1995 | 31 Jul 1996 | British | 77 years |
| Geir Patrick Robinson | Director | 3 Aug 2018 | 1 Dec 2020 | British | 58 years |
| Howard Nigel Green | Director | 1 Aug 1996 | 1 Feb 1999 | British | 76 years |
| Ian Springett | Director | 1 Aug 2005 | 7 Jul 2006 | British | 69 years |
| James David Dunn | Director | 28 Sept 1991 | 31 Jan 1995 | American | 82 years |
| James Lawrence King | Director | 28 Sept 1991 | 31 Jan 1995 | Canadian | 84 years |
| Joachim Martin Mies | Director | 7 Jan 2008 | 1 Feb 2013 | German | 64 years |
| Joan Lesley Wales | Director | 1 Aug 1996 | 1 Feb 1999 | British | 67 years |
| Julian John Watts | Director | 1 Feb 1995 | 27 Mar 1996 | New Zealand | 87 years |
| Katrina Ann Landis | Director | 25 Feb 2007 | 4 Dec 2007 | United States | 67 years |
| Kevin Andrew Leslie Abbott | Director | 1 Sept 1997 | 16 Jan 1998 | British | 73 years |
| Macsen Jay Nuttall | Director | 1 Aug 2016 | 21 Aug 2018 | British | 58 years |
| Michael James Leonard | Director | 1 Jan 2023 | 18 Mar 2025 | American | 56 years |
| Michael John O'sullivan | Director | 1 Feb 2013 | 10 Dec 2014 | British | 62 years |
| Paul Jonathan Reed | Director | 7 Jul 2006 | 27 Feb 2007 | British | 70 years |
| Paul Jonathan Reed | Director | 7 Jan 2008 | 20 Feb 2017 | British | 70 years |
| Raymond Keith Hinkley | Director | 1 May 2002 | 30 Dec 2004 | British | 79 years |
| Robert Stephen Lawson | Director | 20 Dec 2018 | 13 Jan 2020 | British | 56 years |
| Samantha Elizabeth Skerry | Director | 30 Oct 2015 | 1 Aug 2016 | British | 51 years |
| Sharon Hyman Weintraub | Director | 16 Jul 2020 | 1 Jul 2023 | American | 61 years |
| Stuart Antony Daniels | Secretary | 1 Oct 2003 | 1 Aug 2004 | British | - |
| Sven Roger Boss-walker | Director | 20 Dec 2021 | 18 Jun 2024 | Australian | 49 years |
| Timothy Bullock | Director | 25 Feb 2007 | 1 Dec 2010 | British | 65 years |
| Tony Fountain | Director | 1 May 2003 | 1 Nov 2003 | British | 66 years |
| Tony Fountain | Director | 30 Dec 2004 | 1 Apr 2005 | British | 66 years |
| Vivienne Cox | Director | 1 Dec 2001 | 27 Feb 2007 | British | 67 years |
| Yasin Stanley Ali | Secretary | 19 Feb 2001 | 30 Jun 2010 | - | - |