| Christopher Mark David Gill | Director | 19 Jun 2020 | 4 May 2023 | British | 41 years |
| Darren Clayton | Director | 18 Jan 2017 | 19 Jun 2020 | British | 58 years |
| Duncan Peter Thomas Boffey | Director | 20 Mar 2018 | 1 Dec 2018 | British | 64 years |
| Helen Mansell Whittingham | Director | 25 Nov 2021 | 31 Mar 2024 | British | 55 years |
| Jeremy Peter Hartley | Director | 29 May 2015 | 19 Jun 2020 | British | 61 years |
| John Howard Cogbill | Director | 30 Mar 2017 | 1 Aug 2018 | British | 63 years |
| Julian Mark Rudd-jones | Director | 24 Mar 2014 | 18 Jan 2017 | British | 71 years |
| Kevin Stuart Hawkins | Director | 14 May 2018 | 19 Jun 2020 | British | 57 years |
| Kevin Stuart Hawkins | Director | 4 May 2023 | 1 Jul 2024 | British | 57 years |
| Michael Watson | Director | 18 Jan 2017 | 20 Mar 2018 | British | 66 years |
| Morton Bruce Corbitt | Director | 24 Mar 2014 | 14 May 2018 | British | 78 years |
| Paul William Warburton | Director | 31 Jul 2019 | 6 Nov 2019 | British | 54 years |
| Richard Ian Barnett | Director | 18 Jan 2017 | 1 Jan 2025 | British | 62 years |
| Richard Turpin | Director | 24 Mar 2014 | 29 May 2015 | British | 67 years |
| Stephen David Haigh | Director | 24 Mar 2014 | 18 Jan 2017 | British | 61 years |
| Stephen David Lofthouse | Director | 1 Dec 2018 | 18 Jun 2021 | British | 60 years |
| Stephen Mark Fensom | Director | 1 Aug 2018 | 31 May 2019 | British | 60 years |
