| Alexander Millar | Director | 29 Jun 1989 | 23 Nov 2007 | British | 84 years |
| Andrew Forrest Brown Simpson | Director | 23 Mar 1992 | 1 Aug 1994 | British | 82 years |
| Christopher Findlay Norgan | Director | 1 Sept 2010 | 30 Mar 2012 | British | 55 years |
| Duncan Walker | Director | 29 Jun 1989 | 28 Mar 2008 | British | 79 years |
| Emma Campbell | Director | 28 Mar 2008 | 1 Sept 2010 | British | 46 years |
| Frank Kershaw | Director | 29 Jun 1989 | 4 Jul 1990 | British | 102 years |
| Gregory William Mutch | Secretary | 15 Apr 1992 | 30 Sept 2015 | British | - |
| James Caldwell | Director | 29 Jun 1989 | 31 Mar 1999 | British | 90 years |
| James Jack Macnaughtan | Director | 23 Aug 1993 | 4 Nov 1998 | British | 85 years |
| John Cooperwhite Moore | Director | 1 Sept 2004 | 28 Mar 2008 | British | 67 years |
| John Glen | Secretary | 29 Jun 1989 | 15 Apr 1992 | British | - |
| John Glover Bochel | Director | 1 Aug 1994 | 1 Mar 2007 | British | 61 years |
| Michael John Peasland | Director | 9 Sept 1999 | 1 Sept 2004 | British | 74 years |
| Richard Robertson Mcculloch | Director | 29 Jun 1989 | 1 May 1991 | British | 83 years |
| Robert Ian Maclean | Director | 9 Sept 1999 | 31 Mar 2000 | British | 67 years |
| Robert Lundy | Director | 29 Jun 1989 | 9 Sept 1999 | British | 85 years |
| Robert Mark Griffiths | Director | 28 Mar 2008 | 12 Sept 2014 | British | 73 years |
| Stephen Michael Tough | Director | 12 Sept 2014 | 31 Oct 2016 | British | 54 years |