| Ae Kyung Yoon | Director | 5 Sept 2022 | 2 Aug 2024 | South Korean | 43 years |
| Dave Rogers | Director | 9 Oct 2015 | 26 Jan 2018 | Canadian | 53 years |
| David Stuart Elbourne | Director | 3 Jul 2014 | 26 Jan 2018 | British | 62 years |
| Deutschman Jeff | Director | 1 Jan 2015 | 20 Jan 2017 | American | 69 years |
| Julie Anne Clare | Director | 21 Jan 2016 | 26 Jan 2018 | British | 67 years |
| Markus Jan Wierenga | Director | 12 Nov 2013 | 3 Jul 2014 | Dutch | 56 years |
| Nicholas Simon Parker | Director | 26 Jan 2018 | 5 Sept 2022 | British | 57 years |
| Paul Ezekiel | Director | 9 Oct 2015 | 26 Jan 2018 | Australian | 61 years |
| Paul Lawrence Wheeler | Director | 3 Jul 2014 | 10 Feb 2017 | British | 51 years |
| Philip William Kent | Director | 4 Feb 2020 | 2 Aug 2024 | British | 42 years |
| Pier Marco Campolucci-bordi | Director | 12 Nov 2013 | 3 Jul 2014 | British | 56 years |
| Richard Anthony Sadler | Director | 3 Jul 2014 | 20 Oct 2015 | British | 51 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 |