| Andrew Charles Kaye | Director | 25 May 2018 | 23 Dec 2021 | British | 69 years |
| Benjamin James Ernest Guest | Director | 21 Dec 2012 | 25 May 2018 | British | 53 years |
| Bozkurt Aydinoglu | Director | 9 Nov 2015 | 25 May 2018 | British | 55 years |
| David William Dawson Ball | Director | 14 Mar 2014 | 25 May 2018 | British | 58 years |
| Elliot Tegerdine | Director | 31 Jul 2023 | 12 Mar 2025 | British | 50 years |
| Gareth Edward Owen | Director | 21 Dec 2012 | 25 May 2018 | British | 51 years |
| Robin Piers Dummett | Director | 25 May 2018 | 23 Dec 2021 | British | 55 years |
| Roger Skeldon | Director | 23 Dec 2021 | 1 Jul 2023 | British | 47 years |
| Stephen Richards Daniels | Director | 23 Dec 2021 | 12 Mar 2025 | British | 46 years |
| Thomas Andrew Vernon | Director | 21 Dec 2012 | 9 Nov 2015 | British | 43 years |
| Tristan Gordon Alexander Fischer | Director | 2 Apr 2012 | 21 Dec 2012 | British | 51 years |