| Albert Atkinson | Director | 28 Apr 2011 | 28 Nov 2013 | British | 86 years |
| David Michael Bowen | Director | 23 Jun 2017 | 18 Dec 2020 | British | 55 years |
| David Reynolds | Director | 27 Apr 2011 | 30 Jun 2017 | British | 59 years |
| Everard Ashiantha Antony Chanmugam | Director | 27 Apr 2011 | 24 Apr 2014 | British | 72 years |
| Geoffrey Driver | Director | 28 Apr 2011 | 28 Nov 2013 | British | 82 years |
| Hugh Joseph Hood | Director | 27 Apr 2011 | 16 Aug 2016 | British | 60 years |
| Katharine Virginia Stevens | Director | 23 Jun 2017 | 9 Dec 2019 | British | 50 years |
| Louise Alison Clare Blackwell | Director | 18 Nov 2010 | 27 Apr 2011 | British | 44 years |
| Michael Blackburn | Director | 27 Apr 2011 | 30 Jun 2017 | British | 67 years |
| Neil Andrew Rogers | Director | 27 Apr 2011 | 31 Mar 2014 | British | 68 years |
| Owen Gerard Mclaughlin | Director | 28 Apr 2011 | 16 Apr 2014 | British | 67 years |
| Peter Alan Carruthers | Director | 27 Apr 2011 | 31 Oct 2014 | British | 77 years |
| Philip Halsall | Director | 28 Apr 2011 | 31 Oct 2013 | British | 68 years |
| Philip Norman Allenby | Director | 18 Nov 2010 | 27 Apr 2011 | British | 66 years |
| Rachel Stokes | Director | 1 Sept 2015 | 30 Jun 2017 | British | 58 years |
| Trafford Francis Wilson | Director | 27 Jun 2017 | 24 Oct 2018 | British | 58 years |