| Alastair Douglas Mcdougall | Director | 5 Aug 1988 | 30 May 1997 | British | 82 years |
| Alastair Forbes Blyth | Director | 27 Feb 2001 | 2 Aug 2004 | British | 68 years |
| Alexander Fraser Morrison | Director | 5 Aug 1988 | 2 Apr 2001 | British | 78 years |
| Anthony Donnelly | Director | 1 Apr 1995 | 22 Jan 2001 | British | 62 years |
| Anthony Donnelly | Director | 14 Aug 2002 | 27 Feb 2015 | British | 62 years |
| Brian James Leith | Director | 2 Sept 1996 | 4 Oct 2002 | British | 80 years |
| David Charles Turner | Secretary | 19 Aug 2002 | 1 Jul 2005 | Other | - |
| David George Pople | Director | 1 Apr 1990 | 12 Jan 1994 | British | 75 years |
| David George Pople | Director | 14 Jul 2003 | 19 Dec 2008 | British | 75 years |
| David Iain Logue | Director | 18 Oct 2002 | 31 Dec 2009 | British | 68 years |
| David Samuel Kennedy | Director | 1 Feb 2005 | 12 Apr 2006 | British | 68 years |
| Douglas Peters | Director | 19 Mar 2004 | 31 Jan 2005 | British | 59 years |
| Elizabeth Ann Horlock Clarke | Secretary | 1 Apr 2015 | 22 May 2020 | - | - |
| Ewan William Mackay | Director | 1 Apr 2000 | 31 Jan 2005 | British | 64 years |
| Frederick Simon Jones | Director | 1 Jul 1996 | 1 Jul 1999 | British | 87 years |
| Geoffrey Arthur George Shepheard | Secretary | 23 Aug 2004 | 31 Mar 2015 | British | - |
| Gordon Morrison | Director | 5 Aug 1988 | 3 Jun 1991 | British | 75 years |
| Iain Alasdair Robertson | Director | 27 Feb 2001 | 15 May 2002 | British | 77 years |
| Jacqueline Elizabeth Fox | Secretary | 2 Apr 2001 | 17 May 2002 | British | - |
| Jacqueline Fearon | Director | 20 Mar 2001 | 29 Mar 2005 | N Irish | 58 years |
| Jane Kathleen Russell | Director | 19 Jul 2001 | 23 Jan 2002 | British | 55 years |
| John Alexander Hope | Director | 15 Oct 2004 | 19 Dec 2008 | British | 69 years |
| John Morrison | Director | 30 Jun 2000 | 14 Jun 2001 | British | 77 years |
| John Morrison | Secretary | 5 Aug 1988 | 14 Jun 2001 | British | - |
| Keith Martin Howell | Director | 3 Jun 1991 | 3 Feb 2000 | British | 70 years |
| Nigel Edmund Pacey | Director | 30 Jun 2017 | 22 May 2020 | British | 69 years |
| Norman Angus Maclennan | Director | 5 Aug 1988 | 3 Jun 1991 | British | 75 years |
| Norman Angus Maclennan | Director | 1 Jul 1996 | 6 Feb 1998 | British | 75 years |
| Peter William Jeffery | Director | 1 Jul 1996 | 30 Jul 1999 | British | 77 years |
| Philip Talbot | Director | 23 Jan 2001 | 2 Aug 2002 | British | 60 years |
| Robert David Green | Director | 23 Aug 1999 | 23 Oct 2000 | British | 71 years |
| Roderick Mark Prime | Director | 27 Feb 2015 | 30 Jun 2017 | British | 60 years |
| Seamus Joseph Gillen | Director | 2 Apr 2001 | 15 Oct 2002 | British | 67 years |
| Seamus Joseph Gillen | Secretary | 17 May 2002 | 19 Aug 2002 | British | - |
| Stephen John Mcbrierty | Director | 1 Apr 2000 | 14 Nov 2000 | British | 65 years |
| Stephen Liston Lindsay Paterson | Director | 5 Sept 2002 | 30 Apr 2003 | British | 68 years |
| Steven Allenby | Director | 1 Oct 2002 | 31 May 2004 | British | 63 years |