| Andrew George Inglis | Director | 1 Sept 2001 | 1 Mar 2010 | British | 67 years |
| Anthony Bryan Hayward | Director | 1 Sept 1997 | 31 Aug 2000 | British | 69 years |
| Anthony Bryan Hayward | Director | 1 Dec 2002 | 13 Mar 2007 | British | 69 years |
| Basil Richard Ryland Butler | Director | 14 Jan 1989 | 19 May 1989 | British | 96 years |
| Byron Elmer Grote | Director | 20 Oct 1995 | 1 Jul 1997 | British | 78 years |
| Christopher Philip King | Director | 14 Jan 1989 | 19 May 1989 | British | 90 years |
| David Alan Rider | Director | 14 Oct 2014 | 30 Nov 2020 | British | 62 years |
| David Anthony Lawson Jenkins | Director | 20 May 1989 | 12 Dec 1992 | British | 88 years |
| David Charles Harding | Director | 14 Jan 1989 | 3 Apr 1990 | British | 89 years |
| David Christopher Allen | Director | 31 Jul 1997 | 28 Feb 1999 | British | 72 years |
| David Fricke Work | Director | 1 Mar 1999 | 31 Aug 1999 | United States | 81 years |
| David Hugh Walton Payne | Director | 30 Jul 1993 | 6 Nov 1995 | British | 84 years |
| David Simon | Director | 15 Mar 1991 | 9 Jun 1995 | British | 87 years |
| David Stephen Fitzsimmons | Director | 1 Sept 2001 | 1 Oct 2003 | British | 71 years |
| Donald Paul Debrier | Secretary | 27 Oct 1989 | 31 May 1993 | American | - |
| Edmund John Phillip Browne | Director | 14 Jan 1989 | 6 Nov 1995 | British | 78 years |
| Francis William Michael Starkie | Director | 1 Jul 2007 | 30 Sept 2009 | British | 77 years |
| Hugh Edward Norton | Director | 14 Jan 1989 | 30 Jun 1995 | British | 90 years |
| Ian Roland Vann | Director | 1 Jan 2002 | 1 Dec 2006 | British | 78 years |
| Jack Emitt Golden | Director | 1 Sept 1997 | 31 Aug 2000 | U.s. Citizen | 78 years |
| James Douglas Campbell | Director | 3 Apr 1990 | 20 Nov 1992 | American | 85 years |
| Jan Clayton Lyons | Director | 1 Oct 2020 | 6 Apr 2021 | American | 61 years |
| Janet Elvidge | Secretary | 1 Aug 2004 | 1 Feb 2006 | Other | - |
| John Gordon Sinclair Buchanan | Director | 20 Nov 1992 | 6 Nov 1995 | British | 83 years |
| John Harold Bartlett | Director | 1 Jul 2009 | 31 Dec 2017 | British | 73 years |
| Julian Robin Darley | Director | 14 Jan 1989 | 12 Dec 1992 | British | 89 years |
| Karl Russell Seal | Director | 1 Jul 1995 | 6 Nov 1995 | British | 84 years |
| Leslie Atkinson | Director | 14 Jan 1989 | 3 Apr 1990 | British | 82 years |
| Lyle Richard Flury | Director | 1 Apr 1999 | 9 Mar 2000 | Canadian | 79 years |
| Michael Christopher Daly | Director | 1 Dec 2006 | 31 Dec 2013 | British | 73 years |
| Patrick John Gillam | Director | 14 Jan 1989 | 7 Aug 1991 | British | 93 years |
| Paul Ronald Vaight | Director | 7 May 1993 | 6 Nov 1995 | British | 82 years |
| Ralph Charles Alexander | Director | 20 Sept 1999 | 1 Jun 2002 | American | 71 years |
| Richard Carno Jones | Secretary | 14 Jan 1989 | 27 Oct 1989 | British | - |
| Richard Herbert | Director | 8 Jul 2015 | 27 May 2016 | British | 68 years |
| Richard Lake Olver | Director | 20 Oct 1995 | 1 Mar 2003 | British | 79 years |
| Robert Cameron Cumming | Secretary | 1 Jun 2001 | 31 Mar 2002 | British | - |
| Robin Dale Morris | Secretary | 31 May 1993 | 31 May 2001 | British | - |
| Rodney Frank Chase | Director | 20 May 1989 | 12 Dec 1992 | British | 83 years |
| Rodney Frank Chase | Director | 20 Mar 1992 | 31 Dec 1997 | British | 83 years |
| Roger Christopher Harrington | Director | 1 Oct 2009 | 14 Oct 2014 | British | 60 years |
| Rolf Wilhelm Heinrich Stomberg | Director | 3 Apr 1990 | 20 Mar 1992 | German | 86 years |
| Roy Leslie Tooley | Secretary | 11 Feb 2002 | 1 Aug 2004 | British | - |
| Sandra Jean Macrae | Director | 11 Apr 2018 | 28 Aug 2020 | British | 63 years |
| Scott Douglas Urban | Director | 1 Mar 1999 | 31 Aug 2005 | United States | 73 years |
| Shiva Pezeshki Mcmahon | Director | 24 Oct 2016 | 10 May 2017 | British | 58 years |
| Stephen James Ahearne | Director | 14 Jan 1989 | 30 Dec 1992 | British | 87 years |
| Steven Wellesley Percy | Director | 1 Jul 1995 | 6 Nov 1995 | Usa | 80 years |
| William Ellis Armstrong | Director | 1 Sept 2001 | 1 Jul 2009 | British | 69 years |
| William John Saint | Director | 14 Jan 1989 | 31 Dec 1989 | British | 98 years |
| William Joseph Johnson | Director | 14 Jan 1989 | 1 Dec 1995 | American | 92 years |
| Yasin Stanley Ali | Secretary | 1 Feb 2006 | 30 Jun 2010 | Other | - |