| Alistair Richmond Aitken | Director | 28 Apr 2014 | 22 Feb 2016 | British | 52 years |
| Andrew Pinfield | Director | 28 Apr 2014 | 22 Feb 2016 | British | 54 years |
| Benjamin John Pocock | Director | 22 Feb 2016 | 22 Nov 2017 | British | 46 years |
| Darren Scott Jones-molyneux | Director | 22 Feb 2016 | 22 Nov 2017 | British | 54 years |
| Helen Ann Grimshaw | Director | 22 Feb 2016 | 31 Oct 2017 | British | 50 years |
| Joseph Martin Pedlow | Director | 12 Jan 2012 | 1 Jul 2015 | British | 63 years |
| Laura Jane Barlow | Director | 12 Jan 2012 | 28 Apr 2014 | British | 58 years |
| Mark Mccracken Bailie | Director | 14 Oct 2011 | 28 Apr 2014 | British | 52 years |
| Paul Denzil John Sullivan | Director | 26 Nov 2012 | 28 Apr 2014 | British | 59 years |
| Rajesh Sivaraman | Director | 28 Apr 2014 | 22 Feb 2016 | British | 53 years |
| Robert Harper | Director | 5 Sept 2013 | 18 Jul 2016 | Usa | 47 years |
| Simon David Austin Davies | Director | 21 Aug 2012 | 6 Sept 2012 | British | 49 years |
| Stephen Brian Eighteen | Director | 14 Oct 2011 | 11 Oct 2012 | British | 67 years |
| Stephen Paul Nixon | Director | 22 Nov 2017 | 26 Apr 2019 | British | 55 years |