| Andrew David Barnard | Director | 1 Mar 2015 | 31 Jul 2015 | British | 54 years |
| Angela Anna Cross | Director | 3 Mar 2014 | 31 Oct 2017 | British | 55 years |
| Anne Therese Downey | Director | 17 Sept 2008 | 9 Sept 2015 | British | 61 years |
| Antony Peter Jenkins | Director | 1 Apr 2011 | 20 Feb 2012 | British | 64 years |
| Ashley Graham Sylvester | Director | 17 Sept 2008 | 9 Sept 2015 | British | 61 years |
| Barry John O'byrne | Director | 1 Oct 2017 | 16 Jul 2021 | Irish | 50 years |
| Christopher John Lendrum | Director | 10 Jun 2009 | 6 Jun 2018 | British | 78 years |
| Christopher Mark Davies | Director | 1 Jun 2020 | 18 Aug 2025 | British | 55 years |
| David James Stanley Oldfield | Director | 14 Sept 2011 | 7 Sept 2016 | British | 63 years |
| David Miles Smith | Director | 1 Jul 2010 | 30 Jun 2020 | British | 64 years |
| David William Gilman | Director | 30 Jun 2008 | 30 Sept 2016 | British | 73 years |
| Duncan John Rowberry | Director | 13 Jun 2012 | 23 Dec 2013 | British | 66 years |
| Duncan John Rowberry | Director | 17 Sept 2008 | 1 Apr 2011 | British | 66 years |
| Francis Rolleston Gardner | Director | 10 Dec 2008 | 30 Nov 2017 | British | 64 years |
| George Alexander Grant | Director | 30 Jun 2008 | 21 Apr 2009 | British | 64 years |
| Ian Duncan Cowie | Director | 1 Sept 2015 | 30 Sept 2016 | British | 65 years |
| Ian Michael Roy Goswell | Director | 17 Sept 2008 | 9 Sept 2015 | British | 66 years |
| Jakob Pfaudler | Director | 1 Aug 2014 | 31 Aug 2016 | Austrian | 53 years |
| Jeffrey William Alexander Smyth | Director | 17 Sept 2008 | 14 Aug 2009 | British | 64 years |
| Joanne Caroline Pentland | Secretary | 20 Mar 2008 | 31 Dec 2024 | British | - |
| John Dalrymple Callender | Director | 30 Jun 2008 | 31 Dec 2017 | British | 75 years |
| John David Stuart | Director | 30 Jun 2008 | 13 Jun 2012 | British | 62 years |
| John Henry Bishop | Director | 30 Jun 2008 | 4 Mar 2010 | British | 80 years |
| John Paul Thwaite | Director | 30 Sept 2016 | 1 Mar 2021 | British | 54 years |
| Joseph Hennessy | Director | 30 Jun 2008 | 26 May 2019 | British | 83 years |
| Lisa Jane Bartrip | Director | 1 Nov 2017 | 26 Aug 2022 | British | 54 years |
| Malcolm James Brookes | Director | 17 Sept 2008 | 31 Jul 2012 | British | 70 years |
| Mark Alistair Parsons | Director | 20 Feb 2012 | 31 May 2014 | British | 64 years |
| Mark Andrew Stokes | Director | 1 Jul 2013 | 30 Jun 2014 | Scottish | 63 years |
| Martin Peter Frederick Lord | Director | 1 Nov 2012 | 3 Feb 2016 | British | 70 years |
| Martin Richard Dodd | Director | 7 Sept 2016 | 20 Aug 2019 | British | 55 years |
| Michael John Russell-brown | Director | 30 Jun 2008 | 31 Dec 2014 | British | 77 years |
| Michael Keith Betts | Director | 20 Mar 2008 | 31 Mar 2020 | British | 63 years |
| Neil Anthony Johnson | Director | 20 Mar 2008 | 1 Apr 2019 | British | 76 years |
| Nigel Cleator Stead | Director | 30 Jun 2008 | 30 Jun 2011 | British | 76 years |
| Nigel Timothy John Clibbens | Director | 30 Jun 2008 | 28 Feb 2015 | British | 66 years |
| Nivedita Subramanian | Director | 3 Feb 2016 | 1 Dec 2017 | British | 45 years |
| Peter Edmund Lord | Director | 17 Sept 2008 | 31 Dec 2024 | British | 67 years |
| Rick Francis | Director | 14 Sept 2011 | 1 Jul 2013 | British | 64 years |
| Robert Francis Carver | Director | 1 Jan 2015 | 1 Oct 2017 | British | 66 years |
| Robert James Whittick | Director | 1 Mar 2021 | 30 Jun 2024 | British | 58 years |
| Simon Alec Amess | Director | 1 Dec 2019 | 31 Dec 2024 | British | 52 years |
| Simon Christopher Cotton | Director | 10 Dec 2008 | 21 Apr 2009 | British | 62 years |
| Steve Bolton | Director | 1 Nov 2017 | 30 Jun 2021 | British | 63 years |