| Andrew John Mcdonald | Director | 17 Nov 2020 | 9 Feb 2021 | British | 52 years |
| Anthony Kenneth Smythe | Director | 19 Feb 2021 | 31 Jul 2021 | British | 61 years |
| Christopher James Edwards | Director | 20 Jul 2020 | 8 Oct 2021 | British | 62 years |
| Christopher Mark David Gill | Director | 8 Feb 2022 | 4 May 2023 | British | 41 years |
| Christopher Richard Field | Director | 30 Jan 2015 | 22 Dec 2018 | British | 71 years |
| Frederick Ian Maroudas | Director | 17 Mar 2015 | 18 Apr 2018 | British | 63 years |
| Graeme Doctor | Director | 19 Jul 2017 | 26 Jul 2019 | British | 69 years |
| Jeremy Mark White | Director | 31 Jul 2021 | 8 Oct 2021 | British | 66 years |
| Joanna Lisette Fox | Director | 7 Sept 2017 | 16 Mar 2022 | British | 56 years |
| Kate Chien-yu Greener | Director | 7 Feb 2024 | 1 Jan 2025 | British | 52 years |
| Kirk Graham Vaughan Taylor | Director | 8 Sept 2014 | 28 Apr 2017 | British | 62 years |
| Nigel William Michael Goddard Chism | Director | 8 Sept 2014 | 19 Jul 2017 | British | 72 years |
| Nigel William Michael Goddard Chism | Director | 15 Nov 2021 | 8 Feb 2022 | British | 72 years |
| Richard Simon Muir Clancy | Director | 4 May 2023 | 25 Nov 2024 | British | 61 years |
| Robert James Marsden | Director | 22 Dec 2018 | 30 Apr 2019 | British | 71 years |
| Sallyanne Sheppard | Director | 26 Jul 2019 | 18 Oct 2023 | British | 53 years |
| Sarah Elizabeth Knowles | Director | 19 Oct 2023 | 7 Feb 2024 | British | 54 years |
| Stephen Michael Jones | Director | 30 Jan 2015 | 1 Jul 2020 | British | 58 years |
| Tristan Meredith | Director | 19 Oct 2017 | 1 Jul 2020 | British | 46 years |
| Tristan Meredith | Director | 20 Jul 2020 | 17 Nov 2020 | British | 46 years |