| Alan Campbell Ritchie | Director | 24 Oct 2007 | 21 Apr 2009 | British | 59 years |
| Anastasios Christakis | Director | 21 Apr 2009 | 5 Mar 2010 | Greek | 53 years |
| Andrea Finegan | Director | 7 Jul 2003 | 22 Mar 2004 | German | 57 years |
| Anita Catherine Gregson | Director | 21 Apr 2009 | 30 Nov 2012 | British | 62 years |
| Anthony Jackson | Director | 1 Jul 2001 | 19 Jun 2006 | British | 75 years |
| Benjamin Christopher Jacob Dean | Director | 1 Nov 2010 | 8 Aug 2012 | English | 47 years |
| Biif Corporate Services Limited | Corporate Director | 5 Mar 2010 | 19 Apr 2016 | United Kingdom | - |
| Carillion Secretariat Limited | Corporate Secretary | 27 Mar 2000 | 2 Oct 2006 | United Kingdom | - |
| Duncan Elliot Dickson | Director | 27 Mar 2000 | 1 Jul 2001 | British | 72 years |
| Duncan Elliot Dickson | Director | 1 Jul 2001 | 19 Nov 2003 | British | 72 years |
| Graham Farley | Director | 12 Jul 2006 | 2 Oct 2006 | British | 77 years |
| Hcp Social Infrastructure (uk) Limited | Corporate Secretary | 15 May 2013 | 1 Jul 2014 | United Kingdom | - |
| James William Ward | Director | 27 Mar 2000 | 1 Jul 2001 | British | 74 years |
| James William Ward | Director | 22 Mar 2004 | 27 Jan 2014 | British | 74 years |
| James William Ward | Director | 16 Dec 2016 | 31 Mar 2017 | British | 74 years |
| John Ivor Cavill | Director | 19 Apr 2016 | 14 May 2024 | British | 54 years |
| John Mcdonagh | Director | 2 Oct 2006 | 24 Oct 2007 | British | 57 years |
| Martin Stevens | Secretary | 9 Nov 2007 | 15 May 2013 | British | - |
| Masons Nominees Limited | Corporate Director | 3 Jun 1999 | 27 Mar 2000 | United Kingdom | - |
| Masons Secretarial Services Limited | Corporate Secretary | 3 Jun 1999 | 27 Mar 2000 | United Kingdom | - |
| Matthew James Edwards | Director | 27 Jan 2014 | 16 Dec 2016 | British | 41 years |
| Michael Joseph Ryan | Director | 2 Oct 2006 | 21 Apr 2009 | Irish | 60 years |
| Milton Anthony Fernandes | Director | 27 Mar 2000 | 7 Jul 2003 | British | 65 years |
| Nigel Anthony John Brindley | Director | 19 Nov 2003 | 13 Feb 2004 | British | 70 years |
| Nigel Anthony John Brindley | Director | 13 Feb 2004 | 1 Jul 2006 | British | 70 years |
| Peter John Sheldrake | Director | 29 Jun 2018 | 7 Nov 2023 | British | 67 years |
| Philip Peter Ashbrook | Director | 25 Jul 2014 | 29 Jun 2018 | British | 66 years |
| Richard David Hoile | Director | 30 Nov 2012 | 25 Jul 2014 | British | 63 years |
| Richard Keith Sheehan | Director | 31 Mar 2006 | 1 Nov 2010 | English | 51 years |
| Robert Stuart West | Secretary | 2 Oct 2006 | 9 Nov 2007 | British | - |
| Sabrina Sidhu | Director | 17 Oct 2017 | 1 Sept 2019 | British | 47 years |
| Swift Incorporations Limited | Corporate Nominee Secretary | 3 Jun 1999 | 3 Jun 1999 | United Kingdom | - |
| Timothy Richard Pearson | Director | 27 Mar 2000 | 6 Jun 2005 | British | 64 years |