| Alexander Mitchell | Director | 1 Aug 2009 | 30 Jun 2011 | British | 74 years |
| Catherine Mary Bland | Director | 23 Aug 2010 | 29 Nov 2013 | British | 57 years |
| Charles Adair Anderson | Director | 29 Aug 1992 | 30 Jan 1998 | British | 80 years |
| Charles Adair Anderson | Secretary | 30 Jan 1998 | 20 Oct 2006 | British | - |
| Christina Mellon | Director | 1 Aug 2009 | 1 May 2015 | British | 61 years |
| David Alistair Turnbull | Secretary | 9 Feb 2012 | 30 May 2014 | - | - |
| David Dennis Mcintosh | Director | 1 Sept 2005 | 30 Jun 2014 | British | 63 years |
| David Emerson Morton | Director | 1 Sept 2005 | 6 Jan 2012 | British | 74 years |
| David James Mackay | Director | 31 Jan 1997 | 9 May 2003 | British | 83 years |
| David Michael Cooke | Director | 28 Sept 2009 | 16 Dec 2015 | British | 59 years |
| David William Ogden Speirs | Director | 1 Apr 2008 | 18 Sept 2014 | Scottish | 63 years |
| Dermot Julian Jenkinson | Director | 30 Jan 1998 | 30 Apr 1999 | British | 72 years |
| Ellis Alan Nicholas Watson | Director | 16 Sept 2005 | 22 Jul 2009 | British | 59 years |
| Eric Mulholland | Secretary | 2 Jul 2010 | 9 Feb 2012 | - | - |
| Eric Mulholland | Secretary | 29 Aug 1992 | 30 Jan 1998 | British | - |
| Forsyth Rutherford Black | Director | 2 Jun 2014 | 29 Jan 2018 | British | 57 years |
| Francis John Coyle | Director | 1 Sept 2005 | 31 May 2006 | British | 79 years |
| Frederick Ranald Noel-paton | Director | 29 Aug 1992 | 30 Jan 1998 | British | 88 years |
| George Kirkwood | Director | 1 Sept 2005 | 2 Jul 2010 | British | 69 years |
| George Kirkwood | Secretary | 1 Sept 2005 | 2 Jul 2010 | British | - |
| Giles Robert Bryant Wilson | Director | 20 May 2016 | 4 Sept 2018 | British | 53 years |
| Gregory John Michael | Director | 1 Jan 2017 | 15 Oct 2024 | British | 59 years |
| Iain Mills Callaghan | Director | 30 Jan 1998 | 16 Sept 2005 | British | 79 years |
| James Douglas Scott Bennett | Director | 29 Aug 1992 | 31 Jul 1999 | British | 84 years |
| Jane Allison Dyson | Director | 1 Jan 2010 | 28 Mar 2014 | British | 63 years |
| John Francis Alexander Geddes | Secretary | 20 Oct 2006 | 4 Sept 2018 | British | - |
| John Ward | Director | 1 Sept 2005 | 4 Apr 2006 | British | 72 years |
| Mark Stephen Cassie | Director | 1 Jul 2011 | 4 Sept 2018 | British | 62 years |
| Martyn Robert Smith | Director | 5 Jul 1999 | 10 Sept 2002 | British | 71 years |
| Patrick James Macdonald | Director | 9 May 2003 | 1 Sept 2005 | Scottish | 64 years |
| Paul Bernard Dollman | Director | 1 Oct 2002 | 1 Sept 2005 | British | 70 years |
| Paul Bernard Dollman | Director | 16 Mar 2009 | 17 May 2013 | British | 70 years |
| Paula Bell | Director | 10 Jun 2013 | 20 May 2016 | British | 59 years |
| Thomas Boyle | Director | 1 Sept 2005 | 31 Jul 2009 | Irish | 72 years |