| Alexander John Rennie Izat | Director | 28 Dec 1990 | 10 Feb 2000 | British | 93 years |
| Alexander Ross Macmillan | Director | 5 Jun 1990 | 28 Dec 1990 | British | 103 years |
| Andrew Arthur Laing | Director | 24 Aug 2007 | 14 Dec 2016 | British | 73 years |
| Anne Helen Richards | Director | 24 Aug 2007 | 12 Feb 2016 | British | 61 years |
| David Howard Williams | Director | 31 Aug 1989 | 21 May 2004 | British | 81 years |
| Gary Robert Marshall | Director | 24 Aug 2007 | 14 Dec 2016 | British | 64 years |
| Hamish Mcleod Grossart | Director | 31 Aug 1989 | 28 Dec 1990 | British | 68 years |
| Iain Hendry Drummond Lynn | Director | 10 Feb 1993 | 24 Aug 2007 | British | 74 years |
| John Stubbs | Director | 20 Feb 1991 | 22 Mar 1993 | British | 81 years |
| Juanita Linda Fortunee Stanley | Director | 31 Aug 1989 | 1 Dec 1992 | British | 74 years |
| Kenneth Mcleod Gillies | Secretary | 1 Feb 2000 | 17 Apr 2003 | British | - |
| Martin James Gilbert | Director | 24 Aug 2007 | 11 Nov 2011 | British | 70 years |
| Michael Anthony Carney | Director | 4 Jan 2000 | 24 Aug 2007 | British | 65 years |
| Michael Anthony Carney | Secretary | 17 Apr 2003 | 24 Aug 2007 | British | - |
| Michael Charles William Wilby | Director | 20 Feb 1991 | 18 May 1993 | British | 99 years |
| Michael Scott Hardie | Director | 28 Dec 1990 | 10 Feb 2000 | British | 99 years |
| Michael Warren Balfour | Director | 19 May 2004 | 24 Aug 2007 | British | 65 years |
| Peter David Stevenson | Director | 31 Aug 1989 | 28 Dec 1990 | British | 78 years |
| Roderick Macleod Macrae | Director | 24 Aug 2007 | 14 Dec 2016 | British | 61 years |
| Susan Helen Murray | Director | 1 Oct 1998 | 31 May 2005 | British | 60 years |
| William Griffiths Gardiner | Director | 31 Aug 1989 | 31 Mar 2000 | British | 87 years |
| William Griffiths Gardiner | Secretary | 31 Aug 1989 | 1 Feb 2000 | British | - |