| Alan Duke Brown | Director | 16 Dec 2009 | 30 Apr 2018 | British | 65 years |
| Alan Wood Downie | Director | 9 Sept 1992 | 16 Dec 2009 | British | 75 years |
| Alexander Ledingham | Director | 9 Nov 1988 | 23 Oct 1996 | British | 94 years |
| Anthony John Kelley | Director | 9 Nov 1988 | 29 Dec 1995 | British | 81 years |
| Donald Gilmour Sutherland | Director | 1 Jul 1995 | 8 Jun 1999 | British | 85 years |
| Edward Timothy Razzall | Director | 9 Nov 1988 | 8 Jun 1999 | British | 82 years |
| Geoffrey Arthur Ball | Director | 9 Nov 1988 | 16 Dec 2009 | British | 82 years |
| Gerald Campbell More | Secretary | 30 Apr 1998 | 25 Jul 2001 | British | - |
| John Graham Gunn Reid | Director | 17 Mar 2003 | 31 Oct 2018 | British | 61 years |
| Ledingham Chalmers | Corporate Nominee Secretary | 9 Nov 1988 | 30 Apr 1998 | - | - |
| Michael John Whittles | Director | 9 Nov 1988 | 28 Oct 1998 | British | 82 years |
| Moira Ramsay Sibbald | Secretary | 25 Jul 2001 | 24 Jul 2017 | Scottish | - |
| Neil John Stoddart | Director | 30 Apr 2018 | 1 Sept 2025 | British | 56 years |
| Peter Lawrence Goldie | Director | 9 Nov 1988 | 24 Oct 1990 | British | 79 years |
| Robert James Millar | Director | 16 Dec 2009 | 11 Jan 2016 | British | 72 years |
| Robert John Westwater Dick | Director | 1 Nov 1990 | 2 Dec 2008 | British | 70 years |
| Ronald George Hanna | Director | 9 Nov 1988 | 31 Jan 1992 | British | 83 years |
| Stephen James Rosier | Director | 9 Nov 1988 | 18 Sept 1991 | British | 70 years |