| Adrian John Lawton-wallace | Director | 22 Jan 2014 | 22 Sept 2016 | British | 55 years |
| Alasdair Liddell | Director | 20 Aug 2008 | 31 Oct 2008 | British | 77 years |
| Andrew Geoffrey Walsh | Director | 6 Jun 2008 | 15 Jul 2008 | British | 72 years |
| Charles Denis Lenox Conyngham | Director | 20 Aug 2008 | 1 Dec 2010 | British | 91 years |
| Clare Elizabeth Parker | Director | 25 Jul 2014 | 3 Dec 2015 | British | 53 years |
| Clive Harry Pitt | Director | 1 Nov 2011 | 22 Jan 2014 | British | 63 years |
| David William Bowler | Director | 20 Aug 2008 | 18 Jan 2010 | British | 81 years |
| Eugene Martin Prinsloo | Director | 15 Jul 2008 | 1 Dec 2010 | British | 55 years |
| Fulcrum Infrastructure Management Limited | Corporate Secretary | 20 Aug 2008 | 1 Aug 2019 | United Kingdom | - |
| Graham Michael Spence | Director | 24 Feb 2014 | 12 Nov 2014 | British | 65 years |
| Graham Michael Spence | Director | 22 Dec 2015 | 17 Jun 2016 | British | 65 years |
| Humphrey Kenneth Haslam Claxton | Director | 1 Dec 2010 | 1 May 2013 | British | 80 years |
| Ian Mark Willett | Director | 16 Aug 2022 | 4 Mar 2024 | British | 47 years |
| Jamie Russell Andrews | Director | 23 Jul 2014 | 7 Aug 2017 | British | 56 years |
| Jamie Russell Andrews | Director | 6 Jun 2018 | 6 May 2022 | British | 56 years |
| John Frederick Whitehead | Director | 22 Sept 2016 | 30 Nov 2018 | British | 62 years |
| Keith Alexander Marchand Edmunds | Director | 17 May 2017 | 2 Aug 2018 | British | 68 years |
| Nafees Arif | Director | 18 Jan 2010 | 1 Nov 2011 | British | 53 years |
| Neil Terence Mcelduff | Director | 1 Dec 2010 | 6 Mar 2015 | British | 65 years |
| Oliver David Hannan | Director | 1 May 2019 | 6 May 2022 | British | 53 years |
| Paul Malcolm Brown | Director | 1 Aug 2019 | 22 May 2020 | British | 63 years |
| Philip James Young | Director | 20 Aug 2008 | 31 Mar 2013 | British | 70 years |
| Philippa Dawn Robinson | Director | 6 May 2022 | 22 Nov 2024 | New Zealander | 71 years |
| Richard Mark Ashcroft | Director | 18 Jan 2010 | 12 May 2015 | British | 59 years |
| Richard Mark Ashcroft | Director | 22 Dec 2015 | 4 Feb 2016 | British | 59 years |
| Simon Christopher Waters | Director | 22 Nov 2024 | 17 Jun 2025 | British | 54 years |
| Sylvie Pierce | Director | 20 Aug 2008 | 18 Jan 2010 | British | 78 years |
| Thomas Edward George Hayhoe | Director | 20 Aug 2008 | 30 Sept 2010 | British | 70 years |
| Tom Dobrashian | Director | 7 Aug 2017 | 6 Jun 2018 | British | 63 years |
