| Alistair Dickson Mcphee | Director | 28 Oct 2014 | 29 Nov 2016 | British | 68 years |
| Anthony Anthistle | Director | 28 Oct 2014 | 29 Nov 2016 | British | 70 years |
| Catherine Lois Mason | Director | 29 Oct 2014 | 4 Mar 2016 | British | 65 years |
| David John Alexander Wilson | Director | 18 Jan 2016 | 3 Apr 2018 | British | 55 years |
| Edward Anthony Noel Lowe | Director | 28 Oct 2014 | 29 Apr 2015 | British | 72 years |
| Guy Anthony Adams | Director | 29 Feb 2016 | 7 Mar 2025 | British | 58 years |
| Justin Mark Walker | Director | 9 Oct 2014 | 29 Apr 2015 | British | 68 years |
| Justin Stephen Richard Barratt | Director | 9 Oct 2014 | 29 Nov 2016 | British | 57 years |
| Marion Elizabeth Broughton | Director | 29 Apr 2015 | 25 Apr 2016 | British | 64 years |
| Martin John Rolfe | Director | 28 Oct 2014 | 29 Feb 2016 | British | 54 years |
| Michael Paul Stoller | Director | 4 Mar 2016 | 29 Nov 2016 | British | 60 years |
| Michael Paul Stoller | Director | 3 Apr 2018 | 1 Aug 2024 | British | 60 years |
| Patrick Michael O'connell | Director | 29 Apr 2015 | 18 Jan 2016 | American | 78 years |
| Stuart Michael Boulton | Director | 25 Apr 2016 | 30 Apr 2021 | British | 63 years |
| Suzanne Jayne Stratton | Director | 30 Apr 2021 | 20 Feb 2023 | British | 54 years |