| Adrian David Nickols | Director | 2 May 2006 | 24 Aug 2009 | British | 66 years |
| Alan Dennis Barrett | Director | 28 Dec 1991 | 16 Aug 1995 | British | 91 years |
| Andrew Richard Cowell | Director | 22 Feb 2008 | 23 Jan 2009 | British | 68 years |
| Arumugam Nadarajah | Director | 28 Dec 1991 | 30 Sept 1992 | British | 95 years |
| Catherine Margaret Schefer | Director | 13 Oct 2010 | 4 May 2012 | British | 58 years |
| Charles Major Ainger | Director | 28 Dec 1991 | 12 May 1995 | British | 83 years |
| David Anthony Smith | Director | 18 Jun 2015 | 3 Jun 2024 | British | 63 years |
| Garry John Sanderson | Director | 4 May 2012 | 3 Sept 2014 | British | 57 years |
| Giampaolo Garrione | Director | 1 Jan 1999 | 18 Aug 1999 | Italian | 84 years |
| Gina Paola Maloney | Secretary | 5 Nov 2012 | 3 Aug 2018 | - | - |
| Graham Collingwood | Secretary | 28 Dec 1991 | 5 Apr 2004 | British | - |
| Ian Andrew Noble | Director | 1 Jan 2003 | 31 Jan 2020 | British | 69 years |
| Ian James Mcaulay | Director | 1 Jan 2003 | 12 Apr 2007 | British | 61 years |
| John Richardson | Director | 28 Dec 1991 | 30 Sept 1992 | British | 81 years |
| John Somerville | Director | 23 Jul 1992 | 1 Jul 1993 | American | 86 years |
| Jonathan Richard Pike | Director | 22 Feb 2008 | 12 Oct 2010 | British | 57 years |
| Kenneth Arthur Farrer | Director | 2 Oct 1995 | 5 Mar 2008 | British | 82 years |
| Kenneth Derek Staples | Director | 28 Dec 1991 | 2 Oct 1995 | British | 96 years |
| Mark Bicknell | Director | 28 Dec 1991 | 30 Sept 1992 | British | 92 years |
| Mark Biggers | Director | 14 Nov 1996 | 1 Nov 1998 | American | 72 years |
| Matthew Stephen Michael Leonard | Director | 2 Oct 1995 | 31 Dec 1998 | British | 79 years |
| Michael Andrew Oswell | Director | 28 Dec 1991 | 30 Sept 1992 | British | 79 years |
| Michael Andrew Oswell | Director | 2 Oct 1995 | 18 Aug 1999 | British | 79 years |
| Michael John Thompson | Director | 28 Dec 1991 | 30 Sept 1992 | British | 81 years |
| Murli Tolaney | Director | 23 Jul 1992 | 18 Aug 1999 | American | 85 years |
| Richard Wankmuller | Director | 1 Apr 2002 | 2 May 2006 | American | 68 years |
| Robert James Schofield | Director | 28 Dec 1991 | 30 Sept 1992 | British | 80 years |
| Robert James Schofield | Director | 19 Nov 1996 | 30 Sept 2002 | British | 80 years |
| Robert Uhler | Director | 1 Dec 1993 | 18 Aug 1999 | American | 80 years |
| Rodney Charles Bridle | Director | 28 Dec 1991 | 12 May 1995 | British | 84 years |
| Ronald Gordon Cole | Director | 28 Dec 1991 | 31 Dec 2002 | British | 86 years |
| Sarah Ann Moist | Secretary | 31 Jul 2008 | 1 Dec 2016 | British | - |
| Stephen Joseph Frith | Director | 1 Jan 2003 | 23 Jan 2009 | British | 71 years |
| Tiit Heinsoo | Director | 23 Jul 1992 | 23 Oct 1996 | American | 88 years |
| Wilhelmus Maria Eugene Drossaert | Director | 18 Sept 2009 | 8 Jun 2015 | Dutch | 59 years |