| Andrea Margaret Thomas | Secretary | 1 Sept 1997 | 1 Oct 2003 | Other | - |
| Andrew Frank Holmes | Director | 1 Sept 2010 | 3 Mar 2014 | British | 64 years |
| Anne Kathleen Fahy | Director | 3 Apr 2014 | 17 Jul 2015 | Irish | 66 years |
| Brian Peevor | Secretary | 9 Feb 1994 | 31 Aug 1997 | British | - |
| Christopher John Moorhouse | Director | 11 Aug 1992 | 30 Sept 1996 | British | 74 years |
| David Coleman | Director | 1 Apr 1999 | 3 Jan 2012 | British | 69 years |
| David Ian Gilmour | Director | 1 Jan 2009 | 1 Oct 2016 | British | 66 years |
| David Windle | Director | 17 Jul 2015 | 16 Feb 2018 | British | 59 years |
| Dawn Noel | Secretary | 1 Feb 2006 | 3 Nov 2006 | British | - |
| Debasish Satya Sanyal | Director | 1 Nov 2003 | 31 Jul 2006 | British | 61 years |
| Gillian Elizabeth Young | Secretary | 11 Aug 1992 | 9 Feb 1994 | British | - |
| Graham John Elkes | Director | 6 Sept 1996 | 1 Apr 1999 | British | 78 years |
| Gregory Roumbies | Director | 1 Jan 2024 | 14 Jun 2024 | British | 46 years |
| Hooi Lee Chuah | Director | 3 Nov 2019 | 5 Nov 2020 | Malaysian | 52 years |
| Howard Thomas Edward Dewey | Director | 6 Sept 1996 | 1 Apr 1999 | British | 82 years |
| James Edward Glenholme | Director | 1 Jan 2021 | 1 Jan 2024 | British | 52 years |
| Janet Elvidge | Secretary | 3 Nov 2006 | 1 Feb 2008 | Other | - |
| Jonathan Peter Platt | Director | 1 Oct 2016 | 1 Jul 2020 | British | 59 years |
| Jonathan William Winston Wood | Director | 3 Jan 2012 | 3 Nov 2019 | British | 64 years |
| Jorge Manuel Da Silva Tavares | Director | 11 Aug 1992 | 30 May 1994 | Portuguese | 85 years |
| Martin Andres Thomsen | Director | 1 Jul 2020 | 1 Jul 2023 | German | 55 years |
| Matthew Howard Elliott | Director | 16 Feb 2018 | 5 Nov 2020 | New Zealander | 54 years |
| Peter Alexander Short | Director | 30 May 1994 | 31 Mar 1996 | British | 71 years |
| Peter Alexander Short | Director | 1 Apr 1999 | 31 Dec 2008 | British | 71 years |
| Peter Aloizs Ragauss | Director | 1 Feb 2000 | 1 Nov 2003 | American | 69 years |
| Philip Roy Trimmer | Director | 1 Apr 1996 | 1 Apr 1999 | British | 79 years |
| Ralph Charles Alexander | Director | 1 Oct 1996 | 1 Jan 1998 | American | 71 years |
| Rebecca Jayne Wright | Secretary | 1 Feb 2008 | 30 Jun 2010 | Other | - |
| Rita Elizabeth Griffin | Director | 1 Feb 2007 | 1 Sept 2010 | American | 63 years |
| Stuart Antony Daniels | Secretary | 1 Oct 2003 | 1 Aug 2004 | British | - |
| Sue Hodel Rataj | Director | 15 Sept 2006 | 1 Feb 2007 | United States | 69 years |
| Valerio Ferro | Director | 18 Dec 2020 | 1 Jun 2024 | Italian | 54 years |
| Vivienne Cox | Director | 1 Jan 1998 | 1 Feb 2000 | British | 67 years |
| Yasin Stanley Ali | Secretary | 1 Aug 2004 | 30 Jun 2010 | Other | - |
