| Alexander Brian Cooper Short | Director | 30 Jun 2003 | 26 May 2008 | British | 59 years |
| Alexander Brian Cooper Short | Director | 22 Sept 2014 | 4 Jul 2016 | British | 59 years |
| Anthony Leonard Hunt | Director | 9 Sept 1999 | 1 Jan 2007 | British | 80 years |
| Barrie Mason Jackson | Director | 9 Sept 1999 | 31 May 2005 | British | 71 years |
| Crawford Scott Gillies | Director | 15 Mar 2023 | 1 Apr 2025 | British | 70 years |
| Dermid Martin Strain | Director | 1 Nov 2011 | 30 Apr 2013 | British | 64 years |
| Francisco Javier Ferran Larraz | Director | 26 Oct 2009 | 1 May 2012 | Spanish | 70 years |
| Giles Robert Bryant Wilson | Director | 22 Mar 2022 | 12 May 2024 | British | 53 years |
| Grant Glenn Gordon | Director | 9 Sept 1999 | 5 May 2000 | British | 69 years |
| Grant Glenn Gordon | Director | 22 May 2003 | 29 Apr 2004 | British | 69 years |
| Heather Claire Graham | Director | 1 Jan 2007 | 27 Oct 2008 | British | 69 years |
| Ian Barrett Curle | Director | 13 Aug 1999 | 29 Mar 2019 | British | 65 years |
| John James Griffen Good | Director | 13 Aug 1999 | 28 May 2004 | British | 83 years |
| Martin Alexander Cooke | Secretary | 13 Aug 1999 | 31 Aug 2020 | British | - |
| Michael Lamont | Director | 16 Dec 2019 | 10 Sept 2020 | British | 66 years |
| Niall Mcleod Howard | Director | 6 Jan 2003 | 30 Jun 2003 | United Kingdom | 71 years |
| Patrick Marie Charles Thomas | Director | 5 May 2000 | 16 Apr 2003 | French | 79 years |
| Paul Bernard Dollman | Director | 9 Sept 1999 | 31 Dec 2002 | British | 70 years |
| Richard Jackson Arrol Hunter | Director | 28 May 2004 | 1 Jul 2014 | British | 71 years |
| Richard William Farrar | Director | 10 Jun 2013 | 5 Jun 2017 | British | 68 years |
| Roland Van Bommel | Director | 1 Jan 2008 | 18 Sept 2009 | British | 75 years |
| Stella Julie David | Director | 10 Jun 2013 | 29 Feb 2016 | British | 64 years |
| Veronica Lesley Jackson | Director | 1 Sept 2008 | 25 Feb 2011 | British | 62 years |