| Andrew William Booth | Secretary | 16 May 2017 | 1 Sept 2022 | - | - |
| Claire Penelope Solk | Secretary | 1 Sept 2022 | 30 Sept 2025 | - | - |
| David Lawrence | Director | 6 May 2016 | 14 Aug 2017 | British | 62 years |
| Dennis William Patrick Hallahane | Director | 15 Nov 2011 | 21 May 2014 | British | 81 years |
| Derek Lindsay | Director | 20 Sept 2010 | 6 May 2016 | British | 64 years |
| Dominic Nicholas Jackson | Director | 3 Nov 2017 | 31 Jan 2019 | British | 44 years |
| Douglas Colin Walter Stellman | Director | 20 Sept 2010 | 20 Apr 2011 | British | 64 years |
| Frank Murdoch Armstrong | Director | 1 Sept 2014 | 20 Apr 2017 | British | 68 years |
| Iain Gladstone Ross | Director | 1 May 2017 | 31 May 2021 | British | 71 years |
| James Robert Mead | Director | 1 Feb 2019 | 2 Mar 2021 | British | 48 years |
| Jane Veronica Griffiths | Director | 1 Dec 2021 | 1 Jan 2025 | British | 70 years |
| Joseph Anderson | Director | 6 Sept 2023 | 10 May 2024 | British | 66 years |
| Neil David Murray | Director | 20 Sept 2010 | 3 Nov 2017 | British | 62 years |
| Norman Molyneux | Director | 7 Sept 2010 | 3 Nov 2017 | British | 69 years |
| Peter Jackson | Director | 20 Sept 2010 | 31 Mar 2017 | British | 62 years |
| Peter Mcpartland | Director | 18 Oct 2010 | 20 Apr 2017 | British | 71 years |
| Philip John Tottey | Director | 25 Mar 2015 | 30 Sept 2016 | British | 64 years |
| Philip Leon Gould | Director | 20 Sept 2010 | 31 May 2014 | British | 72 years |
| Robert Andrew Donald Scott | Director | 27 Jan 2022 | 1 Jan 2025 | American | 72 years |
| Sarah Lucinda Gordon Wild | Director | 1 Jul 2020 | 30 Sept 2023 | British | 66 years |
| Simon William Thorn | Secretary | 20 Sept 2010 | 16 May 2017 | British | - |
| Thomas Henry Burt | Director | 4 Aug 2020 | 1 Sept 2023 | British | 46 years |
