| Alan Watt Webster | Director | 28 Jan 2014 | 15 Oct 2014 | British | 77 years |
| Alastair Pilgrim | Director | 25 Nov 2016 | 16 May 2017 | British | 49 years |
| Christian Marcel Captieux | Director | 3 Sept 2012 | 31 Dec 2018 | British | 53 years |
| Donna Tait | Director | 25 Nov 2016 | 16 May 2017 | British | 51 years |
| Elizabeth Ann Davies | Nominee Director | 14 Dec 2011 | 14 Dec 2011 | British | 69 years |
| Iain Anthony Pearce | Director | 27 Sept 2022 | 1 May 2024 | British | 55 years |
| Ian Geoffrey Shipway | Director | 22 Nov 2019 | 28 Feb 2022 | British | 71 years |
| James Alexander Stevenson | Director | 28 May 2015 | 31 Jan 2024 | British | 53 years |
| Jonathan Fell | Director | 23 May 2019 | 4 Sept 2020 | British | 49 years |
| Lawrence Adam King | Director | 2 Dec 2019 | 25 Feb 2021 | British | 54 years |
| Lesley Carol Mackintosh | Director | 3 May 2017 | 24 Jul 2018 | British | 62 years |
| Lucy Ewings | Director | 3 Jan 2017 | 20 Jul 2018 | British | 53 years |
| Mark Jason Stokes | Director | 1 Sept 2017 | 23 Jul 2018 | British | 62 years |
| Michael John Hill | Director | 3 Mar 2015 | 23 Jan 2020 | British | 60 years |
| Paul Stephen Morrish | Director | 28 Jan 2014 | 23 May 2019 | British | 61 years |
| Peter Edward Southgate | Secretary | 23 Jul 2012 | 23 Oct 2014 | - | - |
| Richard John Rhodes | Director | 16 Dec 2011 | 1 Nov 2014 | British | 58 years |
| Sanjay Shah | Director | 15 Oct 2014 | 10 Oct 2016 | British | 62 years |
| Sarah Joanna Lord | Director | 11 Dec 2019 | 16 Feb 2021 | British | 49 years |
| Simon John Chamberlain | Director | 28 Jan 2014 | 17 Mar 2017 | British | 61 years |
| Simon Mark Charles | Director | 30 Mar 2020 | 8 Dec 2020 | British | 59 years |
| Wadham St. John Downing | Director | 20 May 2020 | 1 Apr 2021 | British | 59 years |
| Wesley Lloyd Bernard Nixon | Director | 8 Dec 2015 | 10 Jul 2017 | British | 49 years |