| Adrian Waine Robinson | Director | 30 May 2017 | 28 Jul 2020 | British | 65 years |
| Alexander James St John Hannah | Secretary | 14 Aug 2012 | 9 Apr 2014 | - | - |
| Brendan Corcoran | Secretary | 1 Mar 2017 | 30 Mar 2017 | - | - |
| Euan Porter Cameron | Director | 14 Aug 2012 | 9 Apr 2014 | British | 74 years |
| Eva Anna Jadwiga Gromadzki | Director | 14 Aug 2012 | 5 Dec 2013 | British | 59 years |
| Helen Ruth Down | Director | 28 Jul 2020 | 19 Dec 2022 | British | 47 years |
| John Healy | Secretary | 29 Jan 2015 | 1 Mar 2017 | - | - |
| John William Breckenridge | Director | 30 Mar 2017 | 28 Jul 2020 | American | 64 years |
| Keith Stephen Gains | Director | 30 Mar 2017 | 30 May 2017 | British | 49 years |
| Kirsty Louise Usher | Director | 30 May 2017 | 19 Dec 2022 | Scottish | 51 years |
| Liz Oldroyd | Secretary | 30 Mar 2017 | 10 Jun 2020 | - | - |
| Paul Kevin Hughes | Director | 28 Jul 2020 | 19 Dec 2022 | British | 52 years |
| Richard Barker | Director | 14 Aug 2012 | 9 Apr 2014 | British | 58 years |
| Richard Henry Charles Nourse | Director | 9 Apr 2014 | 30 Mar 2017 | British | 62 years |
| Richard Mardon | Director | 9 Apr 2014 | 30 Mar 2017 | British | 62 years |
| Roger Skeldon | Director | 19 Dec 2022 | 1 Jul 2023 | British | 47 years |
| Simon Richard Eaves | Director | 30 Mar 2017 | 19 Dec 2022 | Welsh | 59 years |