| Alexander Charles Brooks | Secretary | 16 Dec 1994 | 6 Jun 1996 | British | - |
| Alison Jane Henriksen | Director | 29 Jan 2020 | 31 Jul 2025 | Australian,british | 58 years |
| Andrew Robert Thompson | Director | 28 Feb 2013 | 15 Jul 2024 | British | 49 years |
| Antony Mark Houghton | Director | 26 Jul 1996 | 31 Mar 1998 | British | 74 years |
| Cara Crichton | Secretary | 12 Apr 2013 | 29 Jan 2020 | - | - |
| Catherine Mary Morton | Director | 26 Sept 1997 | 8 Mar 2000 | British | 59 years |
| Christopher John Vickers | Secretary | 10 Dec 2002 | 22 Jul 2004 | British | - |
| Christopher Jon Pearson | Director | 28 Feb 2013 | 31 Jul 2025 | British | 51 years |
| Conrad Irving Eduard Caspari | Director | 26 Sept 1997 | 8 Mar 2000 | German | 73 years |
| David Godfrey Finch Evans | Director | 16 Dec 1994 | 6 Jun 1996 | British | 82 years |
| David John Corbett | Director | 6 Jun 1996 | 14 Jul 1999 | British | 94 years |
| David Patrick John Crosby | Director | 12 Mar 2008 | 18 Apr 2014 | British | 60 years |
| David Peter Timmins | Director | 29 Mar 2004 | 2 Apr 2007 | British | 73 years |
| David Peter Timmins | Secretary | 22 Jul 2004 | 12 Jun 2006 | British | - |
| Dawn Kesteven | Director | 7 Dec 2001 | 10 Dec 2002 | British | 59 years |
| Francis Hall | Secretary | 1 Apr 2001 | 10 Dec 2002 | British | - |
| Heather Ann Williams | Director | 6 Jun 1996 | 11 Nov 1998 | British | 66 years |
| Heather Ann Williams | Secretary | 6 Jun 1996 | 11 Nov 1998 | British | - |
| Howard Walter Biggs | Director | 6 Jun 1996 | 2 Feb 2000 | British | 94 years |
| Ian Brian Farrelly | Secretary | 12 Jun 2006 | 12 Apr 2013 | British | - |
| Janet Ann Duane | Director | 18 Apr 2014 | 26 May 2022 | Irish | 53 years |
| John Brent Jones | Director | 26 Jun 1996 | 8 Mar 2000 | British | 76 years |
| John Charles Berry | Director | 1 Mar 2000 | 3 Jul 2001 | British | 60 years |
| John Graham Worby | Director | 18 Feb 2009 | 1 Mar 2013 | British | 75 years |
| John Telford Beasley | Director | 26 Jul 1996 | 1 Apr 1997 | British | 96 years |
| Jonathan Lester | Director | 15 Jul 2024 | 10 Jun 2025 | British | 45 years |
| Karim Bitar | Director | 30 Sept 2011 | 13 Sept 2019 | American | 60 years |
| Lawrence David Fairall | Secretary | 11 Nov 1998 | 31 Mar 2001 | British | - |
| Martin Brett Boden | Director | 2 Apr 2007 | 26 Feb 2009 | British | 66 years |
| Michael Roy David Roller | Director | 17 Mar 2003 | 6 Aug 2003 | British | 60 years |
| Nicholas Andrew Young | Director | 26 Jun 1996 | 10 Mar 2000 | British | 78 years |
| Peter Ronald Street | Director | 26 Jun 1996 | 10 Mar 2000 | British | 81 years |
| Richard Kenneth Wood | Director | 11 Nov 1998 | 30 Sept 2011 | British | 81 years |
| Robert James Holliday | Director | 12 Mar 2008 | 31 Jul 2012 | British | 70 years |
| Roger Binney | Director | 6 Jun 1996 | 10 Mar 2000 | British | 76 years |
| Stephen David Wilson | Director | 1 Mar 2013 | 7 Aug 2023 | British | 66 years |
| Stephen Falconer Jones | Director | 26 Jun 1996 | 31 Mar 1998 | British | 78 years |
| Stephen John Amies | Director | 12 Mar 2008 | 1 Apr 2010 | British | 75 years |
| Stewart Alexander Rankin Proctor Crichton | Director | 12 Mar 2008 | 15 May 2013 | British | 74 years |
| Thomas John Kelly | Director | 11 Nov 1998 | 20 Feb 2000 | British | 85 years |
| Thomas Philip Acton | Director | 25 Oct 1999 | 17 Mar 2003 | British | 67 years |
| Thomas Philip Acton | Director | 12 Mar 2008 | 17 Feb 2012 | British | 67 years |
| Valerie Ann Prout | Director | 26 Jun 1996 | 8 Mar 2000 | British | 85 years |