| Andrew John Milton Bester | Director | 1 Oct 2018 | 31 Oct 2020 | British,south African | 61 years |
| Christiaan Franciscus Henricus Herman Vogelzang | Director | 1 Feb 2019 | 18 Jun 2019 | Dutch | 64 years |
| Christopher David Davis | Director | 23 Jul 2019 | 31 Oct 2021 | British | 60 years |
| David William John Bagley | Secretary | 1 Oct 2018 | 5 Apr 2020 | - | - |
| Derek James Weir | Director | 1 Feb 2019 | 31 Jul 2023 | British | 60 years |
| Edward Sebastian Grigg | Director | 11 Jan 2021 | 1 Jan 2025 | British | 61 years |
| Fiona Jane Clutterbuck | Director | 17 Apr 2023 | 7 Mar 2025 | British | 68 years |
| Glyn Michael Smith | Director | 1 Feb 2019 | 1 Jan 2025 | British | 74 years |
| Louise Jeanette Britnell | Director | 1 Mar 2021 | 31 Mar 2025 | British | 47 years |
| Morteza Mahjour | Director | 12 Dec 2019 | 31 Dec 2020 | Canadian | 65 years |
| Nicholas Stuart Slape | Director | 9 Dec 2019 | 13 Feb 2025 | British | 63 years |
| Paul David Copley | Director | 1 Feb 2019 | 31 Dec 2019 | British | 51 years |
| Ranjit Singh | Director | 12 Sept 2022 | 1 Jan 2025 | American | 64 years |
| Richard James Slimmon | Director | 11 Jan 2021 | 1 Jan 2025 | British | 61 years |
| Robert Graham Dench | Director | 1 Feb 2019 | 1 Jan 2025 | British | 76 years |
| Sally-ann Hibberd | Director | 1 Aug 2019 | 31 Jul 2022 | British | 67 years |
| Stephen James Hughes | Director | 1 Jan 2025 | 2 Jun 2025 | British | 54 years |
| Susan Elizabeth Harris | Director | 7 May 2019 | 1 Jan 2025 | British | 65 years |
| William Gennydd Thomas | Director | 1 Feb 2019 | 27 Oct 2023 | British | 67 years |
