| Alison Varney | Director | 10 Oct 2016 | 17 Jan 2017 | British | 57 years |
| Alistair Mark Todd | Director | 1 Apr 2014 | 10 Oct 2016 | British | 51 years |
| Andrew David Middleton | Director | 26 Mar 2021 | 20 Sept 2022 | British | 40 years |
| Andrew David Middleton | Director | 12 Jul 2023 | 31 Dec 2023 | British | 40 years |
| Andrew Mark Reaney | Director | 15 Mar 2017 | 1 Jul 2019 | British | 59 years |
| Anne Elizabeth Bassis | Director | 21 Jan 2010 | 17 Jan 2012 | American/british | 55 years |
| Christopher Howard Morrison | Director | 10 Oct 2016 | 15 Mar 2017 | British | 54 years |
| Christopher John Stern | Director | 14 Oct 2008 | 14 Jan 2011 | English | 69 years |
| Christopher Phillip Anthony Weston | Director | 14 Oct 2008 | 5 May 2009 | British | 62 years |
| Claire Miles | Director | 20 Mar 2013 | 30 Nov 2014 | British | 54 years |
| Daniel Robert Rosenfield | Director | 25 Mar 2024 | 1 Jul 2024 | British | 49 years |
| David Keith Young | Director | 1 Feb 2015 | 10 Oct 2016 | British | 63 years |
| Edward Arthur Yarlet Collier | Director | 15 Oct 2008 | 27 Nov 2009 | British | 65 years |
| Emma Ariadne Henrietta Connell | Director | 1 Jan 2018 | 9 Sept 2022 | British | 54 years |
| Gab Saturnio Barbaro | Director | 17 Jan 2012 | 10 Oct 2016 | Italian | 55 years |
| Jana Siber | Director | 18 Feb 2022 | 28 Feb 2025 | British | 54 years |
| Jonathan Andrew Kimber | Director | 16 Mar 2012 | 19 Mar 2013 | British | 63 years |
| Jorge Pablo Pikunic | Director | 10 Oct 2016 | 31 Mar 2017 | British | 50 years |
| Marc Anthony Angell | Director | 10 Oct 2016 | 9 Aug 2017 | British | 46 years |
| Matthew James Bateman | Director | 27 Nov 2009 | 31 Dec 2011 | British | 58 years |
| Matthew James Bateman | Director | 13 Jan 2021 | 18 Feb 2022 | British | 58 years |
| Michael Robin Uzielli | Director | 14 Jan 2011 | 29 May 2012 | British | 56 years |
| Oliver James Kunc | Director | 31 Dec 2012 | 31 Jan 2014 | British | 48 years |
| Paul Stephen Lawton | Director | 23 Sept 2019 | 1 May 2022 | British | 60 years |
| Peter Michael Martin-simon | Director | 1 Jul 2019 | 13 Jan 2021 | British | 51 years |
| Rajarshi Roy | Director | 31 Mar 2017 | 17 Dec 2023 | British | 51 years |
| Steven James Hughes | Director | 15 Jan 2018 | 23 Sept 2019 | British | 51 years |
| Steven John Buck | Director | 29 May 2012 | 1 Apr 2014 | British | 57 years |
| Stuart David Phillips | Director | 9 Sept 2022 | 1 Dec 2022 | British | 49 years |
| Stuart Stacy Rolland | Director | 31 Dec 2011 | 31 Dec 2012 | British | 62 years |
| William John Orr | Director | 27 Feb 2014 | 10 Oct 2016 | British | 56 years |