| Alan Hardie | Director | 31 Mar 1994 | 16 Nov 1995 | British | 76 years |
| Alexander Brian Cooper Short | Director | 1 Jan 2015 | 4 Jul 2016 | British | 59 years |
| Barrie Mason Jackson | Director | 2 May 1989 | 31 Mar 1994 | British | 71 years |
| George Roy Wilkinson | Director | 31 Mar 1994 | 23 Oct 1995 | British | 82 years |
| Iain Alexander Russell | Director | 2 May 1989 | 14 May 1990 | British | 83 years |
| Ian Barrett Curle | Director | 1 Aug 2006 | 1 Jan 2015 | British | 65 years |
| John Denholm Appleton | Director | 31 Mar 1994 | 16 Nov 1995 | British | 75 years |
| John Denholm Appleton | Secretary | 31 Mar 1994 | 16 Nov 1995 | British | - |
| John James Griffen Good | Director | 2 May 1989 | 1 Aug 2006 | British | 83 years |
| Keith Howard Brewood | Director | 1 Jul 1990 | 13 Sept 1991 | British | - |
| Lyall Hunter | Director | 31 Mar 1994 | 13 Oct 1995 | British | 91 years |
| Martin Alexander Cooke | Director | 16 Nov 1995 | 1 Sept 2020 | British | 65 years |
| Martin Alexander Cooke | Secretary | 1 Mar 1991 | 31 Mar 1994 | British | - |
| Martin Alexander Cooke | Secretary | 16 Nov 1995 | 1 Sept 2020 | British | - |
| Raymond Geoffrey Monbiot | Director | 1 Aug 1990 | 30 Jun 1995 | British | 89 years |
| Richard Jackson Arrol Hunter | Director | 2 May 1989 | 31 Mar 1994 | British | 71 years |
| Richard Jackson Arrol Hunter | Director | 16 Nov 1995 | 1 Jul 2014 | British | 71 years |
| Richard Jackson Arrol Hunter | Secretary | 2 May 1989 | 1 Mar 1991 | British | - |
| Stephen Reverdy Otley | Director | 2 May 1989 | 14 Dec 1990 | British | - |