| Alexander Neil Ferguson Pirie | Director | 5 Jun 1989 | 4 Oct 1991 | British | 65 years |
| Andrew Arthur Laing | Director | 14 Dec 1989 | 17 Jul 2017 | British | 74 years |
| Colin Alexander Bell Crosby | Director | 5 Jun 1989 | 25 Aug 2006 | British | 71 years |
| Denis John Miller | Director | 11 Jun 1990 | 28 Jan 1994 | British | 96 years |
| George Alan Robb | Director | 5 Jun 1989 | 5 Mar 1993 | British | 84 years |
| Hugh Wilson Mcintosh Little | Director | 26 Apr 1994 | 11 Jun 2015 | British | 69 years |
| Martin James Gilbert | Director | 5 Jun 1989 | 5 May 1995 | British | 71 years |
| Michael John Hodgson | Director | 11 Jun 1990 | 31 Oct 1990 | British | 84 years |
| Ronald Scott Brown | Director | 5 Jun 1989 | 29 Feb 1996 | British | 89 years |