| Ae Kyung Yoon | Director | 5 Sept 2022 | 2 Aug 2024 | South Korean | 43 years |
| Christopher David Venning Isard | Director | 9 Jan 2015 | 30 Apr 2015 | British | 65 years |
| Dave Rogers | Director | 30 Apr 2015 | 17 Nov 2015 | Canadian | 53 years |
| Dave Rogers | Director | 17 Nov 2015 | 26 Jan 2018 | Canadian | 53 years |
| David Stuart Elbourne | Director | 30 Apr 2015 | 26 Jan 2018 | British | 62 years |
| Deutschman Jeff | Director | 17 Nov 2015 | 20 Jan 2017 | American | 69 years |
| Douglas James Gardner | Director | 9 Jan 2015 | 30 Apr 2015 | British | 65 years |
| Giovanni Rossario Maruca | Director | 27 Oct 2014 | 9 Jan 2015 | British | 58 years |
| Harry Marcus George Lopes | Director | 14 Oct 2014 | 9 Jan 2015 | British | 49 years |
| Jeff Deutschman | Director | 30 Apr 2015 | 17 Nov 2015 | American | 69 years |
| Julie Anne Clare | Director | 21 Jan 2016 | 26 Jan 2018 | British | 67 years |
| Nicholas Simon Parker | Director | 26 Jan 2018 | 5 Sept 2022 | British | 57 years |
| Paul Ezekiel | Director | 30 Apr 2015 | 17 Nov 2015 | Australian | 61 years |
| Paul Ezekiel | Director | 17 Nov 2015 | 26 Jan 2018 | Australian | 61 years |
| Paul Lawrence Wheeler | Director | 17 Nov 2015 | 10 Feb 2017 | British | 51 years |
| Paul Wheler | Director | 30 Apr 2015 | 17 Nov 2015 | British | 51 years |
| Philip William Kent | Director | 4 Feb 2020 | 2 Aug 2024 | British | 42 years |
| Rollo Andrew Johnstone Wright | Director | 26 Jan 2018 | 5 Sept 2022 | British | 50 years |
| Ronan Niall Kierans | Director | 26 Jan 2018 | 4 Feb 2020 | Irish | 48 years |
| Saira Jane Johnston | Director | 26 Jan 2018 | 8 Dec 2023 | British | 50 years |
| Stephen Campbell Joseph Ellis | Director | 26 Jan 2018 | 28 Jun 2021 | British | 67 years |