| Andrew Michael David Kirkman | Director | 19 Jan 2016 | 30 Jun 2019 | British | 54 years |
| Anthony Donnelly | Director | 10 Dec 2012 | 31 Dec 2015 | British | 62 years |
| Christopher Michael Birch | Director | 3 Nov 2016 | 30 Nov 2018 | British | 45 years |
| Gary Owens | Director | 3 Nov 2016 | 30 Nov 2018 | British | 43 years |
| Geoffrey Keith Howard Mason | Director | 28 Sept 2012 | 10 Dec 2012 | British | 72 years |
| Harworth Secretariat Services Limited | Corporate Secretary | 28 Sept 2012 | 8 Sept 2021 | United Kingdom | - |
| Ian Richard Ball | Director | 19 Jan 2016 | 30 Nov 2018 | British | 55 years |
| Ian Richard Ball | Director | 30 Jun 2019 | 8 Sept 2021 | British | 55 years |
| Jonson Cox | Director | 10 Dec 2012 | 3 Nov 2016 | British | 70 years |
| Michael Richardson | Director | 21 Oct 2014 | 29 Feb 2016 | British | 63 years |
| Paul Martyn Bowes | Director | 19 Mar 2013 | 24 Mar 2015 | British | 62 years |
| Philip Michael Wilson | Director | 19 Jan 2016 | 21 Jun 2018 | British | 58 years |
| Richard Owen Michaelson | Director | 28 Sept 2012 | 31 Dec 2020 | British | 60 years |
| Steven Keith Underwood | Director | 10 Dec 2012 | 31 Dec 2015 | British | 52 years |