| Alan Frank Pritchard | Director | 16 Feb 1998 | 13 Dec 2004 | British | 75 years |
| Andrew James Gray Thomson | Director | 8 Aug 2007 | 26 Oct 2011 | British | 59 years |
| Andrew John Berger-north | Director | 8 Oct 2008 | 26 Oct 2011 | British | 65 years |
| Andrew John Berger-north | Director | 30 Apr 2019 | 5 May 2020 | British | 65 years |
| Brian Ernest Teale | Director | 16 Feb 1998 | 13 Dec 2000 | British | 83 years |
| Brien Frederick Martin | Director | 3 Oct 1992 | 1 May 1996 | British | 91 years |
| Christopher Patrick Willford | Director | 24 Jan 2001 | 1 May 2002 | British | 64 years |
| Christopher Sterritt Davies | Director | 13 Dec 2000 | 13 Dec 2004 | British | 75 years |
| Clare Frances Carson | Secretary | 28 Apr 1999 | 23 Aug 2000 | British | - |
| David Hamilton Casson | Director | 16 Feb 1998 | 24 Jun 1998 | British | 81 years |
| David John Atkins | Director | 30 May 2007 | 1 Oct 2009 | British | 60 years |
| Geoffrey Harcroft Wright | Director | 16 Feb 1998 | 12 Feb 2003 | British | 83 years |
| Helen Joyce Robinson | Secretary | 1 Feb 1993 | 16 Feb 1998 | British | - |
| John Andrew Bywater | Director | 24 Jan 2001 | 31 Mar 2007 | British | 79 years |
| Jonathan Michael Emery | Director | 8 Aug 2007 | 8 Oct 2008 | British | 60 years |
| Kaushik Muljibhai Shah | Director | 1 May 1996 | 16 Feb 1998 | British | 69 years |
| Lawrence Francis Hutchings | Director | 8 Oct 2008 | 28 Sept 2012 | British | 60 years |
| Manish Jayantilal Chande | Director | 3 Oct 1992 | 19 Sept 1997 | British | 70 years |
| Mark Henry Kinkead | Director | 3 Oct 1992 | 16 Feb 1998 | British | 68 years |
| Mark Richard Bourgeois | Director | 17 Mar 2017 | 11 Nov 2021 | British | 58 years |
| Martin Clive Jepson | Director | 8 Oct 2008 | 31 Jul 2011 | British | 64 years |
| Martin Plocica | Director | 26 Oct 2011 | 17 Mar 2017 | American | 64 years |
| Martin Trevor Myers | Director | 14 Dec 1992 | 16 Feb 1998 | British | 85 years |
| Michael John Kill | Director | 24 Jun 1998 | 13 Dec 2000 | British | 73 years |
| Nicholas Alan Scott Hardie | Director | 12 Feb 2003 | 14 Oct 2011 | British | 71 years |
| Nicola Perepeczko Walters | Secretary | 12 Feb 2003 | 23 Apr 2004 | British | - |
| Penelope Jane Glynn Cowan | Secretary | 3 Oct 1992 | 1 Feb 1993 | British | - |
| Peter Frank Cooper | Director | 26 Oct 2011 | 30 Apr 2019 | British | 63 years |
| Peter William Beaumont Cole | Director | 16 Feb 1998 | 12 Feb 2003 | British | 67 years |
| Peter William Beaumont Cole | Director | 8 Aug 2007 | 26 Oct 2011 | British | 67 years |
| Robert John Godwin Richards | Director | 16 Feb 1998 | 24 Jan 2001 | British | 70 years |
| Simon Charles Travis | Director | 5 May 2020 | 7 Aug 2025 | British | 57 years |
| Stuart John Haydon | Secretary | 16 Feb 1998 | 28 Apr 1999 | British | - |
| Stuart John Haydon | Secretary | 23 Aug 2000 | 12 Feb 2003 | British | - |
| Stuart John Haydon | Secretary | 23 Apr 2004 | 22 Sept 2011 | British | - |
| Terence Edwin Smith | Director | 1 May 1996 | 16 Feb 1998 | British | 82 years |
| Vanessa Forster | Director | 12 Feb 2003 | 30 May 2007 | British | 61 years |
| Wai-fong Fong Au | Director | 1 May 2002 | 13 Dec 2004 | British | 70 years |
| Warren Stuart Austin | Director | 8 Apr 2014 | 11 Nov 2021 | British | 60 years |