| Christopher Michael O'shea | Director | 1 Nov 2018 | 24 Jul 2020 | British | 53 years |
| Ian Grant Dawson | Director | 16 Nov 2005 | 31 Mar 2019 | British | 67 years |
| Jeffrey Allan Bell | Director | 31 Aug 2014 | 1 Nov 2018 | Canadian | 59 years |
| Johnathan Richard Ford | Director | 24 Jul 2020 | 18 Jan 2021 | British | 57 years |
| Justine Campbell | Director | 31 Mar 2019 | 30 Sept 2020 | Irish | 56 years |
| Katherine Beresford Ringrose | Director | 18 Jan 2021 | 28 Feb 2023 | British,south African | 52 years |
| Mark Sydney Clare | Director | 16 Nov 2005 | 30 Sept 2006 | British | 69 years |
| Moira Lynne Turner | Director | 17 Sept 2007 | 18 Mar 2008 | British | 64 years |
| Nicholas Lawrence Luff | Director | 17 Sept 2007 | 31 Aug 2014 | British | 59 years |
| Phillip Keague Bentley | Director | 16 Nov 2005 | 17 Sept 2007 | British | 67 years |
| Roy Alan Gardner | Director | 16 Nov 2005 | 30 Jun 2006 | British | 81 years |
| William Samuel Hugh Laidlaw | Director | 3 Jul 2006 | 17 Sept 2007 | British | 70 years |