| Agnes Thomson | Director | 24 Jul 2002 | 31 Jan 2006 | Scottish | 69 years |
| Agnes Thomson | Secretary | 14 Jul 1999 | 1 Oct 2004 | Scottish | - |
| Ahmad Iesa Behbehani | Director | 30 Jun 2000 | 24 Jul 2002 | Kuwaiti | 71 years |
| Alessandro Gilotti | Director | 1 Jan 1998 | 30 Jun 2000 | Italian | 71 years |
| Alessandro Gilotti | Director | 2 Aug 2004 | 31 Jan 2006 | Italian | 71 years |
| Andrew Dixon | Director | 22 May 2008 | 14 Dec 2015 | British | 63 years |
| Brian David Stanley | Director | 26 Apr 1992 | 31 Aug 1992 | British | 83 years |
| Catherine Sheila Macklam | Director | 5 Nov 2018 | 1 Oct 2022 | British | 45 years |
| Christopher Martin Taylor | Director | 26 Apr 1992 | 24 Nov 1992 | British | 82 years |
| Christopher Peter Martin | Secretary | 26 Apr 1992 | 14 Jul 1999 | British | - |
| Colvin Maciver Campbell Colvin-smith | Director | 23 Dec 1993 | 11 Oct 1995 | British | 83 years |
| Fadhel Abdulaziz Al Faraj | Director | 1 Jul 2015 | 5 Nov 2018 | Kuwaiti | 60 years |
| Gerrit Ruitinga | Director | 21 May 2003 | 31 Jan 2006 | Dutch | 70 years |
| Giuliano Franzi | Director | 28 Feb 2006 | 21 Aug 2012 | Italian | 72 years |
| Graham Smith | Director | 1 Sept 1994 | 1 Apr 1997 | British | 79 years |
| Helen Elizabeth Buxton | Secretary | 1 Apr 2011 | 19 Nov 2015 | - | - |
| Jayne Swales | Director | 2 Aug 2004 | 31 Mar 2009 | British | 69 years |
| Jayne Swales | Secretary | 1 Oct 2004 | 1 Apr 2011 | British | - |
| John Finlay Martin Auld | Director | 24 Aug 1992 | 23 Dec 1993 | British | 85 years |
| John Wesley Kitto | Director | 1 Apr 1997 | 21 May 2003 | British | 77 years |
| Michael John Dudley | Director | 2 Aug 2004 | 22 May 2008 | British | 78 years |
| Neil Grieve | Director | 14 Dec 2015 | 11 Mar 2021 | United Kingdom | 64 years |
| Owen Jenkins | Director | 11 Oct 1995 | 31 Dec 1997 | British | 90 years |
| Peter Coules | Secretary | 19 Nov 2015 | 17 Feb 2025 | - | - |
| Pierpaolo Furno | Director | 21 Aug 2012 | 1 Jul 2015 | Italian | 54 years |
| Pieter Declerck | Director | 22 May 2008 | 1 Apr 2014 | Belgian | 52 years |
| Simon Peter Cowie | Director | 2 Nov 1992 | 7 Apr 1995 | British | 78 years |
| Stuart Dron | Director | 2 Aug 2004 | 31 Mar 2008 | British | 78 years |