| Anthony Edward Pennington Smith | Director | 16 Mar 2017 | 3 May 2019 | English | 59 years |
| Anthony Geraint Williams | Director | 16 Mar 2017 | 3 May 2019 | English | 68 years |
| Anthony Geraint Williams | Director | 1 Jul 2016 | 31 Aug 2016 | British | 68 years |
| Charles David Cade | Director | 16 Mar 2017 | 3 May 2019 | English | 61 years |
| Christopher Thanning Gook | Director | 16 Mar 2017 | 3 May 2019 | English | 61 years |
| Giovanni Terranova | Director | 1 Jul 2016 | 31 Aug 2016 | Italian | 54 years |
| Giovanni Terranova | Director | 16 Mar 2017 | 3 May 2019 | Italian | 54 years |
| James Robert Armstrong | Director | 1 Jul 2016 | 3 May 2019 | English | 54 years |
| Jeremy William Sharman | Director | 16 Mar 2017 | 3 May 2019 | British | 63 years |
| John Charles Pennington Smith | Director | 16 Mar 2017 | 3 May 2019 | British | 61 years |
| Michael Antony Rand | Director | 1 Jul 2016 | 3 May 2019 | English | 48 years |
| Timothy Oliver Davis | Director | 16 Mar 2017 | 3 May 2019 | English | 61 years |
| William Doughty | Director | 1 Jul 2016 | 31 Aug 2016 | British | 58 years |
| William Doughty | Director | 16 Mar 2017 | 3 May 2019 | British | 58 years |
