| Abayomi Abiodun Okunola | Director | 5 Jan 2009 | 31 Mar 2010 | British | 59 years |
| Andrew Paul Richardson | Director | 4 Aug 2017 | 26 Jun 2019 | British | 59 years |
| Christian James Alexander Bearman | Director | 16 Feb 2010 | 2 Dec 2016 | British | 52 years |
| Claire Treacy | Director | 1 Aug 2015 | 15 Feb 2019 | Irish | 54 years |
| David John Kirkby | Director | 17 May 2010 | 18 Oct 2017 | Australian | 63 years |
| Didier Michel Tandy | Director | 1 Sept 2009 | 31 Dec 2009 | British | 67 years |
| Fraser James Kennedy | Director | 15 May 2007 | 14 Aug 2015 | British | 51 years |
| James Alistair Sullivan | Director | 5 Oct 2015 | 30 Mar 2018 | British | 55 years |
| Jeremy John Tutton | Director | 8 Dec 2004 | 30 Apr 2006 | British | 60 years |
| Jeremy John Tutton | Director | 1 Sept 2009 | 22 Sept 2011 | British | 60 years |
| Lesley Jeanette Bourke | Director | 7 Dec 2005 | 2 Apr 2009 | British | 67 years |
| Marcus Owen Shepherd | Director | 8 Dec 2004 | 24 Dec 2008 | British | 61 years |
| Marie Suzanne Ferguson | Director | 31 Mar 2010 | 18 Oct 2017 | British | 48 years |
| Mark Anthony Mclaughlin | Director | 18 Oct 2017 | 2 Feb 2021 | Irish | 52 years |
| Martyn James Mccarthy | Director | 24 Dec 2008 | 31 Dec 2015 | Australian | 54 years |
| Matthew Jonathan Bird | Director | 26 Jun 2019 | 1 Dec 2021 | British | 47 years |
| Maureen Mahr Von Staszewski | Director | 15 Sept 2017 | 12 Apr 2019 | German | 49 years |
| Mickola Rosemary Wilson | Director | 8 Dec 2004 | 15 Jan 2008 | British | 71 years |
| Neil Kenneth Robertson | Director | 18 Dec 2015 | 24 Feb 2017 | British | 51 years |
| Nigel Ian Batters | Director | 12 May 2020 | 17 May 2023 | Australian | 49 years |
| Pertti Mikael Vanhanen | Director | 2 Feb 2021 | 31 Jan 2025 | Finnish | 64 years |
| Robert James Cotterell | Director | 14 Aug 2017 | 10 Jun 2022 | British | 52 years |
| Simon Crosbie Marriott | Director | 4 Aug 2017 | 8 Dec 2017 | British | 62 years |
| Stephen Paul Mcbride | Director | 7 Jul 2005 | 31 Oct 2005 | British | 69 years |
| Susan Kathleen White | Director | 17 May 2023 | 7 Jun 2024 | American | 61 years |
| Teesland Secretarial Services Ltd | Corporate Director | 7 Jul 2005 | 7 Dec 2005 | - | - |
| Thierry Hubert Francois Leleu | Director | 24 Sept 2014 | 12 Oct 2016 | French | 59 years |