| Alan Sydney Herbert | Director | 9 Jun 1993 | 10 Jun 1993 | British | 89 years |
| Alan Sydney Herbert | Director | 8 Jun 1994 | 9 Jun 1994 | British | 89 years |
| Antonio Manuel Patricio Comprido | Director | 1 Oct 1997 | 1 Aug 1999 | Portuguesie | 80 years |
| Charles James Buchan | Secretary | 30 Nov 1998 | 22 May 2000 | British | - |
| Christopher John Moorhouse | Director | 15 Oct 1996 | 1 Jun 1998 | British | 74 years |
| Clive Russell Hopkins | Director | 19 Jun 1992 | 1 Sept 1992 | British | 79 years |
| David Alan Rider | Director | 6 Oct 2014 | 30 Nov 2020 | British | 62 years |
| Deirdre Mary Alison Watson | Secretary | 13 Apr 1993 | 30 Nov 1998 | British | - |
| Fiona Victoria Ryder | Director | 30 Nov 2020 | 17 Dec 2021 | British | 51 years |
| Francis William Michael Starkie | Director | 1 Aug 1999 | 30 Sept 2009 | British | 77 years |
| Harold Clive Mather | Director | 1 Sept 1992 | 30 Sept 1995 | British | 79 years |
| Ian Anthony Thornley | Director | 19 Jun 1992 | 31 Jan 1993 | British | 90 years |
| John Graham Mumford | Director | 1 Jun 1998 | 30 Dec 2006 | British | 78 years |
| John Maurice Rasmussen | Director | 3 Nov 2003 | 5 Aug 2005 | Australia | 67 years |
| John Robert Wellwood Orange | Director | 19 Jun 1992 | 14 Oct 1996 | British | 84 years |
| Karin Jacqueline Hawkins | Director | 8 Sept 2011 | 22 Feb 2012 | British | 65 years |
| Michael George Baker | Director | 5 May 1994 | 30 Sept 1997 | British | 80 years |
| Michael John Ashworth | Director | 31 Jan 2012 | 30 Jun 2024 | British | 65 years |
| Michael Joseph Coates | Director | 10 Dec 2013 | 3 Jul 2017 | Dutch | 51 years |
| Michael Peter Mcmahon | Director | 27 Jun 2003 | 31 Oct 2003 | Australian | 63 years |
| Neville John Macpherson | Secretary | 19 Jun 1992 | 14 Dec 1992 | Australian | - |
| Peter James Mather | Director | 30 Dec 2005 | 29 Sept 2021 | British | 66 years |
| Rachel Mary Fox | Director | 22 Aug 2005 | 29 Feb 2008 | British | 72 years |
| Richard Max Wiseman | Director | 13 Apr 1993 | 18 Feb 2011 | British | 75 years |
| Richard Max Wiseman | Secretary | 14 Dec 1992 | 12 Apr 1993 | British | - |
| Robert Clarke Winning | Director | 30 Sept 1995 | 27 Jun 2003 | British | 77 years |
| Robert Joseph Henderson | Director | 27 Mar 2007 | 29 Feb 2008 | British | 64 years |
| Robert Joseph Henderson | Director | 1 Mar 2008 | 31 Oct 2013 | British | 64 years |
| Roger Christopher Harrington | Director | 1 Oct 2009 | 6 Oct 2014 | British | 60 years |
| Russell Graham Elden | Director | 19 Jun 1992 | 5 May 1994 | British | 92 years |
| Sarah Joanne Judd | Director | 7 Sept 2017 | 31 Jan 2020 | British | 48 years |