| Andrew Mainwaring | Director | 28 Jan 2014 | 25 Aug 2019 | British | 55 years |
| Christian Marcel Captieux | Director | 24 Dec 2013 | 24 Dec 2013 | British | 53 years |
| Christian Marcel Captieux | Director | 28 Jan 2014 | 31 Dec 2018 | British | 53 years |
| Christopher Guy Johnson | Director | 28 Jan 2014 | 20 Jun 2018 | British | 62 years |
| Elizabeth Ann Davies | Nominee Director | 18 Jul 2012 | 18 Jul 2012 | British | 69 years |
| George Richard Collier | Director | 24 Jul 2017 | 25 Aug 2019 | British | 36 years |
| James Alexander Stevenson | Director | 23 Jan 2018 | 31 Jan 2024 | British | 53 years |
| John Arthur Davey | Director | 28 Jan 2014 | 28 Feb 2017 | British | 58 years |
| Michael John Hill | Director | 27 Jan 2015 | 23 Jan 2020 | British | 60 years |
| Paul Stephen Morrish | Director | 28 Jan 2014 | 8 Aug 2022 | British | 61 years |
| Peter Edward Southgate | Secretary | 20 Jul 2012 | 23 Oct 2014 | - | - |
| Raymond Francis Pierce | Director | 28 Jan 2014 | 25 Aug 2019 | British | 80 years |
| Richard John Rhodes | Director | 19 Jul 2012 | 1 Nov 2014 | British | 58 years |
| Richard Swann | Director | 28 Jan 2014 | 24 Jul 2017 | British | 59 years |
| Simon John Chamberlain | Director | 28 Jan 2014 | 17 Mar 2017 | British | 61 years |
| Wadham St. John Downing | Director | 20 May 2020 | 1 Apr 2021 | British | 59 years |