| Alan Edward Birch | Director | 2 Jul 2003 | 27 Aug 2004 | British | 55 years |
| Alan Edward Birch | Director | 8 Nov 2004 | 21 Sept 2006 | British | 55 years |
| Andrew John Sutton | Director | 18 Sept 2001 | 11 Feb 2004 | British | 69 years |
| Barry Simon Williams | Director | 18 Feb 2005 | 31 Aug 2006 | British | 55 years |
| Charles Cairns Auld | Director | 26 Jun 2007 | 28 Feb 2009 | British | 82 years |
| David Jason Mcevedy | Director | 29 May 2009 | 12 Sept 2018 | British | 60 years |
| Geoffrey Keith Howard Mason | Director | 18 Sept 2001 | 7 Oct 2002 | British | 71 years |
| Guy Roland Marc Pigache | Director | 7 Oct 2002 | 6 Dec 2002 | British | 65 years |
| Ian Richard Gethin | Director | 18 Feb 2005 | 31 Aug 2006 | British | 54 years |
| Infrastructure Managers Limited | Corporate Secretary | 25 Jul 2013 | 2 Jul 2018 | United Kingdom | - |
| Jonathan Mark Entract | Director | 6 Dec 2002 | 18 Feb 2005 | British | 53 years |
| Kenneth William Gillespie | Director | 24 Feb 2009 | 1 Nov 2011 | British | 64 years |
| Laurence John Edwards | Director | 17 Jan 2008 | 28 Feb 2009 | British | 66 years |
| Laurence John Edwards | Secretary | 26 Jun 2007 | 28 Feb 2009 | British | - |
| Laurence John Edwards | Secretary | 26 Jun 2007 | 25 Jul 2013 | Other | - |
| Mark Richard Woodhams | Director | 7 Oct 2002 | 18 Feb 2005 | British | 59 years |
| Patrick Hugh Gardiner | Director | 7 Oct 2002 | 7 Jun 2004 | British | 76 years |
| Paul George Milner | Director | 18 Sept 2001 | 7 Oct 2002 | British | 64 years |
| Paul George Milner | Director | 7 Jun 2004 | 15 Jun 2004 | British | 64 years |
| Paul Mcculloch | Director | 8 Nov 2004 | 31 Aug 2006 | British | 60 years |
| Richard John Dixon | Director | 24 Sept 2002 | 7 Oct 2002 | British | 54 years |
| Robert Mcgowan | Director | 9 Feb 2006 | 26 Jun 2007 | British | 69 years |
| Robert Nigel Johnson | Director | 11 Feb 2004 | 15 Jun 2004 | British | 67 years |
| Robin James Oram | Director | 31 Aug 2006 | 24 Mar 2009 | British | 76 years |
| Secretariat Services Limited | Corporate Secretary | 18 Sept 2001 | 1 Sept 2005 | United Kingdom | - |
| Smif Secretariat Services Limited | Corporate Secretary | 1 Sept 2005 | 26 Jun 2007 | - | - |
| William Robert Doughty | Director | 26 Aug 2004 | 21 Sept 2006 | British | 57 years |