| Alan Taylor Jaffrey | Director | 1 Jul 1995 | 30 Dec 1996 | British | 83 years |
| David Alan Wilson | Secretary | 4 Apr 1989 | 30 Sept 1998 | British | - |
| David John Winnall | Director | 29 Sept 1989 | 17 Aug 1993 | British | 82 years |
| Derek Morrice | Director | 22 Feb 2008 | 8 Apr 2017 | British | 64 years |
| Duncan Walker | Director | 31 Mar 2000 | 28 Mar 2008 | British | 79 years |
| Francis Linden | Director | 4 Apr 1989 | 28 May 1995 | British | 91 years |
| George Edward Burdett | Director | 18 Nov 1991 | 31 Jan 1996 | British | 82 years |
| Gregory William Mutch | Secretary | 30 Sept 1998 | 30 Sept 2015 | British | - |
| Ian Kenneth Smith | Director | 24 Aug 2017 | 13 May 2022 | British | 58 years |
| Ian Robert Jenkins | Director | 29 Sept 1989 | 18 Nov 1991 | British | 86 years |
| James Jack Macnaughtan | Director | 4 Apr 1989 | 31 May 1998 | British | 85 years |
| James Pitcairn Hogg | Director | 4 Apr 1989 | 31 Dec 1992 | British | 96 years |
| John Cooperwhite Moore | Director | 1 Sept 2004 | 28 Mar 2008 | British | 67 years |
| John David Cruickshank | Director | 4 Apr 1989 | 29 Sept 1989 | British | - |
| John Fredrick Robbie | Director | 22 May 2009 | 23 Aug 2017 | British | 70 years |
| John Glover Bochel | Director | 1 Aug 1994 | 23 Aug 2017 | British | 61 years |
| Joseph Edward Tiernan | Director | 1 Jul 1995 | 4 Apr 2013 | British | 76 years |
| Michael John Peasland | Director | 9 Sept 1999 | 1 Sept 2004 | British | 74 years |
| Nicholas Woodliffe Browne | Director | 29 Sept 1989 | 31 Mar 1993 | British | 85 years |
| Norman James Davidson | Director | 10 Jul 1995 | 9 Oct 1998 | British | 79 years |
| Patricia Dalby Cruickshank | Director | 4 Apr 1989 | 29 Sept 1989 | British | - |
| Philip Frank Kenneth Ellis | Director | 24 Aug 2017 | 29 Apr 2022 | British | 61 years |
| Ralph Michael Peters | Director | 4 Apr 1989 | 29 Sept 1989 | British | 79 years |
| Robert Ian Maclean | Director | 1 Apr 1998 | 31 Mar 2000 | British | 67 years |
| Robert Mark Griffiths | Director | 28 Mar 2008 | 25 Aug 2014 | British | 73 years |
| Simon James Cruickshank | Director | 4 Apr 1989 | 29 Sept 1989 | British | - |
| Simon Lafferty | Director | 24 Aug 2017 | 26 Nov 2021 | British | 56 years |