| Angela Hildreth | Director | 26 Feb 2016 | 8 Dec 2017 | British | 45 years |
| Carl Andrew Sterritt | Director | 3 May 2011 | 24 Feb 2012 | British | 57 years |
| Carl Andrew Sterritt | Secretary | 20 May 2013 | 6 Jul 2015 | - | - |
| Carl Andrew Sterritt | Director | 26 Feb 2016 | 21 Apr 2020 | British | 57 years |
| Gregory Paul Madison | Director | 18 Jun 2021 | 24 Jul 2024 | American | 58 years |
| Gunnar Carsten Weikert | Director | 23 Feb 2012 | 26 Feb 2016 | German | 62 years |
| Hans-peter Rudolf | Director | 12 May 2021 | 31 Oct 2023 | Swiss | 59 years |
| James Ian Sheridan | Director | 23 Feb 2012 | 26 Feb 2016 | British | 55 years |
| Joanne Elizabeth Estell | Director | 1 May 2017 | 26 Sept 2017 | British | 54 years |
| Richard Crispin Morgan Jones | Director | 3 May 2011 | 24 Feb 2012 | British | 59 years |
| Richard Crispin Morgan Jones | Secretary | 10 May 2012 | 1 Jul 2015 | - | - |
| Richard Crispin Morgan Jones | Director | 26 Feb 2016 | 27 Jan 2017 | British | 59 years |
| Sandy Martin Eisen | Director | 20 May 2013 | 26 Feb 2016 | British | 70 years |
| Tim William Watts | Director | 21 Apr 2020 | 30 Sept 2021 | British | 68 years |