| Benjamin Mark Whawell | Director | 18 Sept 2014 | 13 Nov 2017 | British | 54 years |
| Glyn Jones | Director | 13 Nov 2017 | 20 Mar 2020 | British | 68 years |
| John Andrew Upton | Director | 12 Sept 2022 | 5 Aug 2024 | British | 52 years |
| Lewis Ian Girdwood | Director | 9 Sept 2019 | 24 Jul 2023 | British | 59 years |
| Lubna Qunash | Director | 5 Aug 2024 | 7 Apr 2025 | Jordanian | 47 years |
| Nicholas Anthony Dilworth | Director | 8 Mar 2021 | 10 Apr 2024 | British | 53 years |
| Philip David Grewock | Director | 12 Sept 2022 | 5 Aug 2024 | British | 42 years |
| Richard Edward Charles Butcher | Secretary | 18 Sept 2014 | 13 Nov 2017 | - | - |
| Richard Edward Charles Butcher | Director | 18 Sept 2014 | 13 Nov 2017 | British | 62 years |
| Warwick Brady | Director | 14 Jun 2018 | 30 Apr 2021 | British | 62 years |
| William Andrew Tinkler | Director | 13 Nov 2017 | 14 Jun 2018 | British | 63 years |