| Alan James Melville Leitch | Director | 1 Jul 2004 | 10 Dec 2015 | British | 68 years |
| Andrew John Moore | Director | 1 Jun 2006 | 13 Oct 2014 | British | 61 years |
| Christopher Sugden | Director | 30 Oct 2000 | 29 Nov 2001 | British | 77 years |
| Christopher Sugden | Director | 29 Nov 2001 | 11 Dec 2002 | British | 77 years |
| David J Turner | Secretary | 5 Oct 1988 | 30 Sept 1997 | British | - |
| David John Holloway | Director | 16 Nov 2003 | 30 Jun 2004 | British | 76 years |
| David Robert Williamson | Director | 6 Dec 2000 | 29 Nov 2001 | British | 60 years |
| Edward Laurence John Adams | Secretary | 20 Jan 2015 | 29 Jul 2015 | - | - |
| James Richard Gray | Director | 29 Nov 2001 | 6 Feb 2019 | British | 60 years |
| Joan Douglas | Director | 1 Nov 1998 | 28 Jan 2000 | British | 63 years |
| John Michael Denning Graham | Director | 5 Oct 1988 | 30 Oct 2000 | British | 82 years |
| Julian Alexander Hardinge | Director | 1 Nov 1998 | 7 Nov 2001 | British | 81 years |
| Peter Martin Jeyes | Director | 29 Nov 2001 | 2 Mar 2012 | British | 80 years |
| Peter Martin Jeyes | Secretary | 29 Nov 2001 | 1 Aug 2014 | British | - |
| Pietro Raffaele Notarangelo | Director | 9 Nov 1992 | 30 Oct 2000 | British | 70 years |
| Pietro Raffaele Notarangelo | Secretary | 1 Oct 1997 | 30 Oct 2000 | British | - |
| Robert Coutts Shearer | Secretary | 30 Oct 2000 | 29 Nov 2001 | British | - |
| Robert George Menzies Clow | Director | 5 Oct 1988 | 30 Oct 2000 | British | 92 years |
| Robert William Gray | Director | 12 Feb 2007 | 15 Dec 2011 | British | 62 years |
| Robert Wishart Hunter | Director | 5 Oct 1988 | 13 Feb 1989 | British | - |
| Robin Gordon Hill | Director | 1 Nov 1998 | 29 Nov 2001 | British | 77 years |
| Robin Gordon Hill | Director | 29 Nov 2001 | 11 Dec 2002 | British | 77 years |
| Sam Bursey | Director | 10 Nov 2015 | 4 Jan 2019 | British | 50 years |
| Terence Frederick Field | Director | 17 Sept 2002 | 31 Dec 2007 | British | 67 years |
| William Taylor Campbell Anderson | Director | 5 Oct 1988 | 29 Nov 2001 | British | 78 years |
| William Taylor Campbell Anderson | Director | 29 Nov 2001 | 30 Apr 2011 | British | 78 years |