| Ian Stuart Anderson | Director | 4 Aug 2011 | 24 Sept 2014 | British | 64 years |
| James Henry Michael Clayton | Director | 4 Aug 2011 | 19 Sept 2014 | British | 53 years |
| Jamieson William George Lowe | Director | 29 Jun 2018 | 16 Oct 2019 | British | 57 years |
| Jennifer Wright | Secretary | 31 Aug 2016 | 11 Apr 2019 | - | - |
| John Leonard Boyton | Director | 4 Aug 2011 | 19 Jun 2016 | British | 79 years |
| Jonathan Patrick Frederik Bradley | Director | 4 Aug 2011 | 4 Apr 2014 | British | 66 years |
| Mark Samuel Cowie | Director | 22 May 2015 | 9 Feb 2024 | British | 51 years |
| Matthew Taylor Bugden | Director | 4 Aug 2011 | 20 Dec 2018 | British | 59 years |
| Neil Andrew Forster | Director | 4 Aug 2011 | 6 Mar 2024 | British | 56 years |
| Nicholas Anthony Crosfield Bower | Director | 4 Aug 2011 | 17 Oct 2014 | British | 51 years |
| Peter Francis Touche | Director | 26 Jan 2021 | 24 Jun 2025 | British | 58 years |
| Richard Dylan Jones | Director | 4 Aug 2011 | 5 Apr 2013 | British | 52 years |
| Richard Dylan Jones | Director | 18 Jul 2014 | 23 May 2019 | British | 52 years |
| Sebastian James Speight | Director | 4 Aug 2011 | 30 Sept 2020 | British | 59 years |
| William Vicat Harrison | Director | 19 Jun 2018 | 23 May 2019 | English | 54 years |