| Achal Prakash Bhuwania | Director | 23 Oct 2014 | 22 Feb 2016 | British | 47 years |
| Charlotte Sophie Ellen Douglass | Director | 24 Apr 2018 | 8 Sept 2024 | British | 48 years |
| Daniel Marinus Maria Vermeer | Director | 7 Feb 2021 | 14 Dec 2022 | Dutch | 45 years |
| Elaine Leng Siew | Director | 23 Oct 2014 | 7 Jul 2025 | Malaysian | 59 years |
| George Robert Marsh | Director | 23 Oct 2014 | 18 Nov 2022 | British | 77 years |
| James Thomas Lloyd | Director | 27 Oct 2021 | 7 Jul 2025 | British | 36 years |
| John Edward Haan | Director | 23 Oct 2014 | 22 Feb 2016 | British | 48 years |
| Julian Denzil Sutcliffe | Director | 12 Sept 2024 | 12 Sept 2025 | British | 58 years |
| Juliet Maria Hancox | Director | 23 Oct 2014 | 1 Apr 2015 | British | 64 years |
| Mark William Grinonneau | Director | 18 Jun 2015 | 23 Oct 2023 | British | 56 years |
| Nikki Hopkins | Director | 24 Oct 2023 | 30 Aug 2024 | British | 56 years |
| Peter John Sheldrake | Director | 23 Oct 2014 | 23 Apr 2018 | British | 67 years |
| Rosemary Lucy Jude Deeley | Director | 22 Feb 2016 | 9 Feb 2021 | British | 42 years |
| Simon John Barnes | Director | 23 Oct 2014 | 18 Jun 2015 | British | 58 years |