| Benjamin John Guyatt | Director | 1 Apr 2010 | 1 Jun 2011 | British | 51 years |
| Bibi Rahima Ally | Director | 27 Jun 2007 | 5 Jul 2007 | British | 66 years |
| Carsten Matthias Wendt | Director | 1 Dec 2016 | 26 Oct 2021 | German | 50 years |
| Christian Leclercq | Director | 12 Jun 2008 | 31 Mar 2010 | Belgian | 61 years |
| Daniel Hugues Gauthier | Director | 30 Jul 2009 | 31 Mar 2016 | Belgian | 69 years |
| Daniel John Cooper | Director | 1 Jan 2016 | 31 Jan 2019 | Australian | 56 years |
| David Jonathan Clarke | Director | 1 Jun 2011 | 1 Dec 2016 | British | 52 years |
| Geoffrey Charles Stretton | Director | 9 Aug 2007 | 29 Aug 2007 | British | 74 years |
| Ian Leonard Flavell | Director | 5 Jul 2007 | 13 Jun 2008 | British | 71 years |
| Lorenz Nager | Director | 5 Jul 2007 | 31 Aug 2021 | German | 66 years |
| Malcolm Roger Pye | Director | 9 Aug 2007 | 29 Aug 2007 | British | 81 years |
| Malcolm Roger Pye | Secretary | 5 Jul 2007 | 13 Jun 2008 | British | - |
| Martin Robert Henderson | Nominee Secretary | 27 Jun 2007 | 5 Jul 2007 | British | - |
| Michael Anthony Eberlin | Director | 5 Jul 2007 | 13 Jun 2008 | British | 64 years |
| Nicholas Arthur Dawe Benning-prince | Director | 15 Oct 2013 | 16 Sept 2025 | British | 52 years |
| Patrick Joseph O'shea | Director | 13 Jun 2008 | 31 Dec 2015 | British | 68 years |
| Ralph Dominik Von Achten | Director | 13 Jun 2008 | 31 Dec 2008 | German | 61 years |
| Ralph Dominik Von Achten | Director | 28 Apr 2016 | 31 Jan 2020 | German | 61 years |
| René Samir Aldach | Director | 1 Sept 2021 | 16 Sept 2025 | German | 47 years |
| Richard Robert Gimmler | Director | 14 May 2009 | 30 Dec 2009 | British | 59 years |
| Robert Charles Dowley | Director | 9 Dec 2013 | 16 Sept 2025 | British | 54 years |
| Roger Thomas Virley Tyson | Secretary | 31 Jul 2008 | 10 Mar 2016 | British | - |
| Seyda Pirinccioglu | Director | 19 Jul 2010 | 31 Aug 2013 | Turkish | 55 years |
| Simon Lloyd Willis | Director | 28 Jan 2019 | 16 Sept 2025 | British | 61 years |
