| Alan John Stewart Kilpatrick | Director | 1 Sept 2015 | 30 Jun 2025 | British | 61 years |
| Alistair Ian Munro | Director | 1 Mar 1998 | 7 Jun 2004 | British | 82 years |
| Alistair James Graham Stevenson | Director | 15 Nov 1990 | 3 Jun 1994 | British | 68 years |
| Allan Burns | Director | 13 Oct 2004 | 1 Jun 2006 | British | 79 years |
| Bryan Harold Donaghey | Director | 1 Sept 2006 | 14 May 2013 | British | 65 years |
| David Andrew Cutter | Director | 14 May 2013 | 31 Dec 2019 | Australian | 58 years |
| David Anthony Hardie | Director | 1 Jan 1999 | 1 Dec 1999 | Scottish | 82 years |
| David Darragh Maxwell Scott | Director | 1 Jan 1995 | 13 Sept 1996 | British | 82 years |
| David William Alexander Macdonald | Director | 14 Apr 1989 | 29 Oct 1993 | British | 92 years |
| Derek Richardson Hall | Director | 18 Feb 1994 | 31 Mar 1995 | British | 88 years |
| Derrick John Fillingham | Director | 14 Apr 1989 | 12 Jan 1990 | British | 88 years |
| Gaëlle Jeanne Dominique Sully Ép. Hutt | Director | 31 Dec 2019 | 29 Oct 2020 | French | 52 years |
| Graham Robert Hutcheon | Director | 1 Jun 2002 | 30 Jun 2021 | British | 63 years |
| Ian Barrett Curle | Director | 18 Feb 1994 | 29 Mar 2019 | British | 65 years |
| Ian Douglas Mackenzie | Director | 14 Apr 1989 | 31 Jan 1996 | British | 90 years |
| Ian Keith Meakins | Director | 11 Feb 2000 | 31 May 2002 | British | 70 years |
| James Bruxner | Director | 14 Apr 1989 | 31 Dec 1994 | British | 94 years |
| James Neil Shaw | Director | 14 Apr 1989 | 31 Jul 1992 | British | 97 years |
| Jane Louise Graham | Director | 29 Mar 2019 | 11 Jun 2025 | British | 47 years |
| Jeffrey Milliken | Director | 1 Jun 2002 | 16 May 2005 | British | 62 years |
| John Alexander Rose Macphail | Director | 14 Apr 1989 | 22 Mar 1991 | British | 103 years |
| John Brian Ashworth | Director | 1 Aug 1992 | 28 Oct 1993 | British | 90 years |
| John Hall | Director | 16 Sept 1996 | 31 Dec 1998 | British | 86 years |
| John James Griffen Good | Director | 23 Mar 1991 | 31 May 2002 | British | 83 years |
| John Robert Ford | Secretary | 14 Apr 1989 | 31 May 2010 | British | - |
| Michael Archibald | Director | 1 Oct 1995 | 31 Dec 1998 | British | 85 years |
| Michael William Kydd | Director | 28 Oct 2021 | 30 Jun 2025 | British | 62 years |
| Pamela Elizabeth Scott | Director | 23 Apr 2018 | 31 Dec 2019 | British | 57 years |
| Peter James Sidney Russell | Director | 14 Apr 1989 | 29 Oct 1993 | British | 99 years |
| Peter Joseph Bates | Director | 14 Apr 1989 | 26 Mar 1998 | British | 88 years |
| Richard William Bedford | Director | 1 Jul 2005 | 23 Apr 2018 | British | 60 years |
| Richard William Bedford | Director | 31 Dec 2019 | 8 Dec 2021 | British | 60 years |
| Roger John Walkey | Director | 1 Apr 1995 | 30 Sept 1995 | British | 81 years |
| Sarah Jeanne Walton | Director | 29 Oct 2020 | 28 Oct 2021 | British | 57 years |
| Thomas Alan Leigh | Director | 8 Jun 2004 | 31 Dec 2016 | British | 68 years |
| Thomas Morrison Honeyman Miller | Director | 14 Apr 1989 | 2 Nov 1993 | British | 89 years |
| Thomas Ness | Director | 26 Nov 2001 | 30 Sept 2004 | British | 74 years |
| Turnbull Hutton | Director | 1 Jan 1999 | 5 Oct 2001 | British | 80 years |
| William David Rae | Director | 1 Oct 1995 | 31 Dec 2015 | British | 73 years |
| William Spalding Thomson | Director | 14 Apr 1989 | 22 Oct 2001 | British | 85 years |