| Andrew Christopher Glen | Director | 22 Jan 2019 | 21 Dec 2020 | British | 65 years |
| Barrington Peter Deadman | Director | 3 Apr 2018 | 1 Oct 2019 | British | 83 years |
| Charles Richard Harvey Mckay | Director | 11 Dec 2017 | 11 Dec 2017 | British | 62 years |
| Charles Richard Harvey Mckay | Director | 18 Dec 2017 | 21 Apr 2022 | British | 62 years |
| Eddie Peter Minshull | Director | 8 Jan 2021 | 22 Jul 2021 | British | 68 years |
| Helen Rachael Wylde-archibald | Director | 8 Jan 2021 | 31 Mar 2025 | British | 58 years |
| Ian Calvert | Director | 26 Jan 2017 | 23 Jun 2023 | English | 71 years |
| Martin Glyndwr Hurst Williams | Director | 5 May 2022 | 29 Apr 2024 | British | 47 years |
| Paul Andrew Buttery | Director | 22 Jul 2021 | 30 Jun 2024 | British | 63 years |
| Peter George Ka-yin Bachmann | Director | 21 Dec 2020 | 27 Jan 2023 | British | 49 years |
| Stephen John Best | Director | 24 Aug 2023 | 8 Oct 2025 | British | 60 years |