| Andrea Alessandro Orlandi | Director | 31 Jul 2014 | 23 May 2017 | Italian | 55 years |
| Andrea Alessandro Orlandi | Director | 26 Jul 2022 | 27 Jun 2023 | British | 55 years |
| Christopher Mark Taylor | Director | 21 Jun 2013 | 21 Jun 2022 | British | 67 years |
| Christopher Raymond Andrew Darroch | Director | 21 Jun 2013 | 5 May 2023 | British | 60 years |
| David John Price | Director | 23 Jul 2015 | 21 Jun 2022 | British | 66 years |
| Emily Ann Mousley | Director | 21 Jun 2013 | 5 Jul 2013 | British | 58 years |
| Emily Ann Mousley | Director | 29 Aug 2013 | 23 Jun 2016 | British | 58 years |
| Emily Clare Bird | Director | 21 Jun 2022 | 22 May 2025 | British | 45 years |
| Kirsty Ann-marie Wilman | Director | 30 May 2023 | 31 May 2024 | British | 46 years |
| Richard James Peacock | Director | 21 May 2025 | 2 Jun 2025 | British | 52 years |
| Richard James Thor Kolb | Director | 29 Aug 2013 | 30 Jun 2015 | British | 56 years |
| Sandra Hammond | Director | 5 Jul 2013 | 30 Jun 2017 | British | 46 years |
| Timothy George Barlow | Director | 23 Jul 2015 | 8 Aug 2019 | British | 40 years |
| Vanisha Ashok Thakrar | Director | 23 Jul 2018 | 26 Oct 2018 | British | 39 years |
| Vichada Chuangdumrongsomsuk | Director | 26 Oct 2018 | 1 Jun 2020 | American | 35 years |
| Wenzel Rochus Benedikt Hoberg | Director | 5 Jul 2013 | 31 Jul 2014 | German | 57 years |