| Albert Clive Taylor-clague | Director | 9 Feb 1993 | 31 Dec 1993 | British | 97 years |
| Alfred Merton Vinton | Director | 1 May 1995 | 23 Mar 2000 | American | 88 years |
| Alfred Merton Vinton | Director | 12 Jul 2006 | 15 Feb 2008 | American | 88 years |
| Antony Patrick Joy Fraser | Director | 15 Feb 2008 | 20 Aug 2009 | British | 61 years |
| Charles Henry Oliver St John | Director | 26 Feb 1998 | 23 Mar 2000 | British | 63 years |
| Charles Neil Mcmicking | Director | 7 Mar 2000 | 22 Jul 2001 | British | 61 years |
| David Francis Osbourne | Director | 31 Dec 1993 | 31 Dec 1996 | British | 89 years |
| David Warwick Symondson | Director | 26 Feb 1998 | 23 Mar 2000 | British | 71 years |
| Gerard Absalom | Secretary | 30 Sept 1996 | 8 Jan 1998 | British | - |
| Hugh Anthony Lewis Holland Mumford | Director | 2 Jun 1994 | 15 Feb 2008 | British | 81 years |
| Jennifer Jane Ivy | Secretary | 9 Feb 1993 | 22 Mar 1996 | British | - |
| Jeremy George Thomas Young | Director | 12 Feb 2016 | 13 Apr 2018 | British | 54 years |
| Julian David Knott | Director | 4 Aug 1996 | 23 Mar 2000 | British | 76 years |
| Kalvin Bret Booth | Director | 4 Aug 1996 | 8 Mar 2002 | Australian | 63 years |
| Mark William Speeks | Director | 15 Feb 2008 | 9 Jun 2011 | British | 64 years |
| Mark William Speeks | Secretary | 15 Feb 2008 | 9 Jun 2011 | British | - |
| Michael Brian Dunn | Director | 1 Aug 2011 | 23 Oct 2019 | British | 65 years |
| Michael Craig Stoddart | Director | 9 Feb 1993 | 1 May 1995 | British | 94 years |
| Michael David George | Director | 16 Mar 2004 | 7 Jun 2006 | British | 53 years |
| Peter Eric Rowledge | Director | 9 Feb 1993 | 31 Dec 1993 | British | 97 years |
| Philip John Dyke | Director | 9 Feb 1993 | 15 Feb 2008 | British | 80 years |
| Philip John Dyke | Secretary | 22 Mar 1996 | 15 Feb 2008 | British | - |
| Robert Clarke | Director | 26 Feb 1998 | 23 Mar 2000 | British | 65 years |
| Robert John Lewis | Director | 31 Jul 1997 | 15 Feb 2008 | British | 82 years |
| Robert Nigel Mcconnell | Director | 26 Feb 1998 | 23 Mar 2000 | British | 68 years |
| Stephen Daryl Ozin | Director | 31 Jul 1997 | 15 Feb 2008 | British | 64 years |
| Thomas Rupert King | Director | 26 Feb 1998 | 23 Mar 2000 | British | 63 years |
| Timothy Dominic James Syder | Director | 26 Feb 1998 | 23 Mar 2000 | British | 68 years |