| Alan Peter Fordyce | Director | 16 Mar 2005 | 27 Sept 2013 | British | 59 years |
| Alastair John Angus Mcewan | Director | 2 Jun 2014 | 30 Apr 2015 | British | 68 years |
| Bruce Balfour | Director | 2 Apr 2009 | 31 Oct 2014 | British | 63 years |
| Gary Martin Steven | Director | 1 Jul 2021 | 28 Sept 2022 | British | 49 years |
| Infrastructure Managers Limited | Corporate Secretary | 1 Apr 2016 | 31 Mar 2022 | United Kingdom | - |
| Ivan Hong Yee Wong | Director | 12 Mar 2007 | 19 Feb 2008 | British | 47 years |
| James Band | Secretary | 9 Apr 2015 | 1 Apr 2016 | - | - |
| John Christian Elliot | Director | 5 Feb 2003 | 29 Apr 2004 | British | 74 years |
| John David George Perks | Director | 30 Apr 2004 | 31 Jul 2013 | British | 82 years |
| John Mcdonagh | Director | 11 Nov 2013 | 1 Nov 2015 | British | 57 years |
| John Mcdonagh | Director | 30 Jun 2023 | 29 Jan 2024 | British | 57 years |
| Martin Timothy Smith | Director | 30 Apr 2004 | 16 Mar 2005 | British | 59 years |
| Martin Timothy Smith | Director | 1 Nov 2013 | 1 Mar 2019 | British | 59 years |
| Michael James Findlay | Director | 19 Feb 2008 | 11 Mar 2009 | British | 56 years |
| Peter Kenneth Johnstone | Director | 1 Nov 2022 | 30 Jun 2023 | British | 61 years |
| Peter Kenneth Johnstone | Secretary | 5 Feb 2003 | 30 Apr 2015 | British | - |
| Prima Director Limited | Corporate Director | 16 Jan 2003 | 5 Feb 2003 | United Kingdom | - |
| Prima Secretary Limited | Corporate Secretary | 16 Jan 2003 | 5 Feb 2003 | United Kingdom | - |
| Rhona Macdonald Bree | Director | 16 Mar 2005 | 14 Jun 2005 | British | 52 years |
| Richard William Francis Burge | Director | 9 Apr 2015 | 1 Sept 2017 | British | 67 years |
| Richard William Francis Burge | Director | 6 Nov 2018 | 8 May 2019 | British | 67 years |
| Rory William Christie | Director | 1 Sept 2017 | 6 Nov 2018 | British | 68 years |
| Rory William Christie | Director | 8 May 2019 | 1 Jul 2021 | British | 68 years |
| William George Robertson | Director | 5 Feb 2003 | 27 Sept 2013 | British | 81 years |
