| Andrew Patrick Hollis | Director | 6 Mar 2019 | 27 Sept 2023 | British | 72 years |
| Cameron Roy Marchand Buchanan | Director | 18 Oct 2016 | 4 Oct 2022 | British | 80 years |
| Christian De Goey | Director | 18 Oct 2016 | 6 Mar 2019 | Dutch | 57 years |
| David Lawrence Jamison | Director | 1 Dec 2015 | 8 Feb 2016 | British | 82 years |
| George Charles Lucan | Director | 29 Jan 2019 | 27 Sept 2023 | British | 59 years |
| Jonathan Eldred Wilhelmus Tidswell -pretorius | Director | 1 Jun 2015 | 5 Jul 2018 | British | 50 years |
| Jonathan Richard Scott Hill | Director | 1 Dec 2015 | 31 Aug 2016 | British | 58 years |
| Patrick James Earl Of Clanwilliam | Director | 6 Mar 2019 | 22 Mar 2024 | British | 66 years |
| Paul Abram Vonk | Director | 1 Dec 2015 | 29 Jan 2019 | Dutch | 52 years |
| Paul Forrest | Director | 18 Jul 2022 | 5 May 2024 | British | 57 years |
| Peter Anthony Valaitis | Director | 1 Jun 2015 | 1 Jun 2015 | British | 76 years |
| Richard Herbert | Director | 1 Apr 2023 | 18 Jun 2025 | British | 69 years |
| Robert James Shepherd | Director | 18 Oct 2016 | 29 Jan 2019 | British | 60 years |