| Andrea Cicero | Director | 21 Dec 2012 | 24 Apr 2018 | Italian | 55 years |
| Emilio Jose Sanchez Vicente | Director | 20 Dec 2012 | 21 Dec 2012 | Spanish | 53 years |
| Franco Martinelli | Director | 16 May 2014 | 30 Nov 2020 | British | 66 years |
| Iain Stuart Urquhart | Director | 22 Sept 2015 | 31 May 2022 | British | 61 years |
| James Edward Macgregor Drummond | Director | 21 Dec 2012 | 3 Sept 2014 | British | 64 years |
| Karen Veronica Hayzen-smith | Director | 24 Apr 2018 | 13 Jan 2020 | British | 56 years |
| Kevin John Garvey | Director | 13 Jan 2020 | 12 Sept 2022 | British | 59 years |
| Leonardo Tricarico | Director | 3 Sept 2014 | 11 Dec 2020 | Italian | 84 years |
| Luis Francisco Inigo Moreno-ventas | Director | 20 Dec 2012 | 21 Dec 2012 | Spanish | 50 years |
| Peter Lloyd Rogers | Director | 16 May 2014 | 31 Aug 2016 | British | 79 years |
| Shaun Doherty | Director | 31 May 2022 | 30 Sept 2024 | British | 58 years |
| William Tame | Director | 16 May 2014 | 31 Aug 2016 | British | 72 years |