| Brian Lynn Staples | Director | 9 Jul 1992 | 18 Apr 1994 | British | 81 years |
| Brian Pellard | Director | 18 Apr 1994 | 10 Jul 1997 | British | 84 years |
| Christopher Kamaris | Director | 11 Oct 2018 | 29 Nov 2019 | British | 68 years |
| David Guyot | Director | 2 Feb 1998 | 9 Jun 2006 | Us Citizen | 80 years |
| Francis Milne Kennedy | Director | 1 Mar 1996 | 2 Jul 1999 | British | 88 years |
| Gary Yows Gunn | Director | 2 Feb 1998 | 9 Jun 2006 | Us Citizen | 89 years |
| Geoffrey Pearson | Director | 31 Jul 1997 | 30 Apr 1998 | British | 67 years |
| Geoffrey Pearson | Secretary | 31 Jul 1997 | 30 Apr 1998 | British | - |
| George Christian Hedemann | Director | 9 Jun 2006 | 19 Jun 2012 | American | 83 years |
| Gordon Arthur Ivan Waters | Director | 18 Apr 1994 | 29 Feb 1996 | British | 79 years |
| James Joseph Mccormack | Director | 25 Sept 1992 | 31 Jul 1997 | British | 72 years |
| James Joseph Mccormack | Secretary | 9 Jul 1992 | 31 Jul 1997 | British | - |
| John Richard Gelston | Director | 9 Jul 1992 | 18 Apr 1994 | British | 85 years |
| Lee James Mills | Director | 1 Sept 2008 | 17 Oct 2018 | British | 68 years |
| Martyn Charles Palmer | Director | 2 Jul 1999 | 20 Dec 2007 | British | 73 years |
| Michael Alan Langley | Director | 25 Sept 1992 | 10 Jul 1997 | British | 83 years |
| Michael Alan Langley | Director | 2 Jan 2001 | 31 May 2001 | British | 83 years |
| Michael Alan Langley | Secretary | 2 Jan 2001 | 31 May 2001 | British | - |
| Nicholas Warwick Hammond | Director | 9 Jul 1992 | 25 Sept 1992 | British | 83 years |
| Patrick George Davidson | Director | 9 Jul 1992 | 2 Feb 1998 | American | 78 years |
| Paul James Adam | Director | 9 Jul 1992 | 2 Feb 1998 | American | 92 years |
| Philip James Kendall | Director | 30 Apr 1998 | 2 Jan 2001 | British | 61 years |
| Philip James Kendall | Secretary | 30 Apr 1998 | 2 Jan 2001 | British | - |
| Richard Charles Boynton | Director | 24 Aug 1992 | 2 Feb 1998 | American | 77 years |
| Robert Glenwood Ruisch Jnr | Director | 9 Jul 1992 | 15 Jul 1996 | American | 87 years |
| Roderick David Maciver | Director | 10 Jul 1997 | 1 Aug 2008 | British | 78 years |
| Rodney Gordon Wood | Director | 9 Jul 1992 | 31 Aug 1996 | British | 80 years |
| Rolf Stamm | Director | 9 Jul 1992 | 11 Mar 1994 | American | 90 years |
| Sally Anne Currin | Director | 31 May 2001 | 1 Sept 2008 | British | 70 years |
| Sally Anne Currin | Secretary | 31 May 2001 | 1 Sept 2008 | British | - |
| Thomas Griffiths | Director | 2 Feb 1998 | 9 Jun 2006 | Us Citizen | 76 years |
| Timothy Francis George | Secretary | 1 Sept 2008 | 30 Jun 2017 | British | - |
| Wayne Frank Hall | Director | 11 Mar 1994 | 2 Feb 1998 | American | 82 years |
| Westley Maffei | Secretary | 1 Jul 2017 | 11 Sept 2018 | - | - |