| Andrew Matthews | Director | 12 Jan 2006 | 1 Oct 2009 | British | 64 years |
| Anita Catherine Gregson | Director | 25 Apr 2007 | 19 Dec 2011 | British | 62 years |
| Beif Corporate Services Limited | Corporate Director | 15 Mar 2011 | 19 Dec 2011 | United Kingdom | - |
| Carillion Secretariat Limited | Corporate Secretary | 3 Jun 2004 | 1 Dec 2009 | United Kingdom | - |
| David Boyd Lindsay | Director | 3 Jun 2004 | 13 Jan 2006 | British | 67 years |
| David Geoffrey Lewis | Director | 19 Dec 2011 | 2 Dec 2015 | British | 57 years |
| Dorothy Deakin-elliott | Director | 3 Jun 2004 | 6 Jun 2008 | British | 67 years |
| Geoffrey Alan Quaife | Director | 2 Dec 2015 | 6 Nov 2017 | British | 71 years |
| Graham Farley | Director | 12 Jul 2006 | 6 Jun 2008 | British | 77 years |
| Hackwood Directors Limited | Corporate Nominee Director | 2 Mar 2004 | 3 Jun 2004 | United Kingdom | - |
| Hackwood Secretaries Limited | Corporate Nominee Secretary | 2 Mar 2004 | 3 Jun 2004 | United Kingdom | - |
| Hannah Gilbey | Director | 3 Jun 2004 | 7 Nov 2005 | British | 55 years |
| James Christopher Heath | Director | 31 Oct 2018 | 2 Sept 2019 | British | 51 years |
| Jasvinder Bal | Director | 5 Jul 2006 | 11 Dec 2006 | British | 47 years |
| John Philip George | Director | 19 Dec 2011 | 2 Dec 2015 | British | 58 years |
| Nigel Anthony John Brindley | Director | 3 Jun 2004 | 1 Jul 2006 | British | 70 years |
| Nigel Anthony John Brindley | Director | 30 Jul 2008 | 15 Mar 2011 | British | 70 years |
| Rachel Louise Turnbull | Director | 6 Nov 2017 | 31 Oct 2018 | British | 48 years |
| Ross William Driver | Director | 1 Apr 2015 | 15 Jun 2021 | British | 45 years |