| Adrian Alan Russell | Director | 3 Jan 1993 | 28 Feb 1998 | British | 80 years |
| Andrew Michael David Kirkman | Director | 4 Nov 2016 | 30 Jun 2019 | British | 54 years |
| Christopher Edward Martin Flanagan | Director | 3 Jan 1993 | 4 Jan 2000 | British | 74 years |
| Christopher Mawe | Director | 8 Jul 2004 | 17 Sept 2007 | British | 64 years |
| Christopher Michael Birch | Director | 4 Nov 2016 | 30 Nov 2018 | British | 45 years |
| David Campbell | Director | 3 Jan 1993 | 2 Sept 2000 | British | 82 years |
| David Graham Brocksom | Director | 18 Sept 2007 | 6 Dec 2012 | British | 66 years |
| Garold Ralph Spindler | Director | 28 Oct 2004 | 9 Jul 2007 | American | 79 years |
| Gary Owens | Director | 4 Nov 2016 | 30 Nov 2018 | British | 43 years |
| George William Jarrett | Director | 4 Aug 1994 | 1 Sept 1999 | British | 92 years |
| Gordon Allister Mcphie | Director | 15 Dec 1993 | 1 Oct 2004 | British | 74 years |
| Harworth Secretariat Services Limited | Corporate Secretary | 29 Oct 2012 | 8 Sept 2021 | United Kingdom | - |
| Ian Richard Ball | Director | 4 Nov 2016 | 30 Nov 2018 | British | 55 years |
| Ian Richard Ball | Director | 30 Jun 2019 | 8 Sept 2021 | British | 55 years |
| Jeremy Rhodes | Secretary | 31 May 2012 | 15 Aug 2012 | British | - |
| Jeremy Rhodes | Director | 23 May 2012 | 15 Aug 2012 | British | 68 years |
| John William Gough | Director | 3 Jan 1993 | 6 Sept 2000 | British | 75 years |
| Jonathan Simon Lloyd | Director | 9 Jul 2007 | 15 Nov 2010 | British | 70 years |
| Melvin Garness | Director | 3 Jan 1993 | 28 Oct 2004 | British | 81 years |
| Melvin Garness | Secretary | 3 Jan 1993 | 29 Mar 2005 | British | - |
| Patrick Sampson O'brien | Director | 3 Jan 1993 | 28 Nov 2005 | British | 84 years |
| Philip Michael Wilson | Director | 29 Oct 2012 | 21 Jun 2018 | British | 58 years |
| Richard Andrew Cole | Director | 15 Nov 2010 | 31 May 2012 | British | 61 years |
| Richard Andrew Cole | Secretary | 29 Mar 2005 | 31 May 2012 | British | - |
| Richard John Budge | Director | 3 Jan 1993 | 27 Feb 2001 | British | 79 years |
| Richard Owen Michaelson | Director | 6 Dec 2012 | 31 Dec 2020 | British | 60 years |
| William Rowell | Director | 1 Jun 1993 | 23 Nov 1998 | British | 80 years |