| Adel Malcolm | Director | 12 Jul 2017 | 11 Mar 2021 | British,hungarian | 49 years |
| Ali Reza Toutounchi | Director | 23 May 2016 | 11 Mar 2021 | British | 68 years |
| Andrew Kevin Overy | Director | 15 Dec 2009 | 26 Apr 2013 | British | 61 years |
| Diarmuid O'donovan | Director | 29 Jun 2016 | 3 Feb 2017 | Irish | 50 years |
| Honor Julia Eli Solomon | Director | 13 Mar 2015 | 11 Oct 2021 | British | 48 years |
| Hugh Peter Bartholomew Cutler | Director | 15 Feb 2013 | 24 Apr 2014 | British | 54 years |
| James Peter Dawes | Director | 15 Sept 2014 | 20 Nov 2015 | British | 55 years |
| Kevin John Gregory | Director | 22 Feb 2010 | 4 Jul 2012 | British | 69 years |
| Michael David Thomas Craston | Director | 22 Feb 2010 | 15 Feb 2013 | British | 68 years |
| Sarah Frances Elizabeth Aitken | Director | 13 Mar 2015 | 11 Mar 2021 | British | 62 years |
| Simon James Thompson | Director | 3 May 2013 | 5 Feb 2016 | British | 59 years |
| Siobhan Geraldine Boylan | Director | 12 Jul 2013 | 18 Jan 2019 | British | 57 years |