| Alan Edward Birch | Director | 2 Jul 2003 | 27 Aug 2004 | British | 56 years |
| Alan Edward Birch | Director | 8 Nov 2004 | 7 Dec 2006 | British | 56 years |
| Alan Edward Birch | Director | 2 Jan 2008 | 3 Feb 2014 | British | 56 years |
| Andrew John Sutton | Director | 2 Aug 2001 | 11 Feb 2004 | British | 70 years |
| Andrew Matthews | Director | 28 Jun 2002 | 22 Dec 2005 | British | 64 years |
| Andrew Richard Kershaw | Director | 20 Jun 2014 | 1 Nov 2014 | British | 61 years |
| Bryan Robin Geoffrey Gilbert Smith | Director | 17 Aug 2001 | 28 Jun 2002 | British | 82 years |
| Desmond Mark French | Director | 21 Nov 2019 | 2 Feb 2021 | Irish | 51 years |
| Gary Nelson Robert Honeyman Brown | Director | 1 Apr 2019 | 21 Nov 2019 | British | 51 years |
| Geoffrey Keith Howard Mason | Director | 5 Feb 2001 | 17 Aug 2001 | British | 72 years |
| Henry Lafferty | Director | 5 Feb 2001 | 2 Aug 2001 | British | 73 years |
| Ian Richard Gethin | Director | 22 Dec 2005 | 2 Jan 2008 | British | 55 years |
| Kenneth Andrew Mclellan | Director | 22 Dec 2005 | 31 Mar 2019 | British | 65 years |
| Louise Atkins | Director | 1 Nov 2014 | 17 Apr 2018 | British | 49 years |
| Patrick Hugh Gardiner | Director | 17 Aug 2001 | 7 Jun 2004 | British | 77 years |
| Paul George Milner | Director | 14 Aug 2001 | 17 Aug 2001 | British | 65 years |
| Paul George Milner | Director | 7 Jun 2004 | 23 Jun 2004 | British | 65 years |
| Paul Mcculloch | Director | 8 Nov 2004 | 18 Dec 2006 | British | 61 years |
| Richard John Marshall | Director | 6 Jan 2023 | 1 Oct 2025 | British | 56 years |
| Robert Nigel Johnson | Director | 11 Feb 2004 | 15 Jun 2004 | British | 68 years |
| Robert Sean Mcclatchey | Director | 17 Aug 2001 | 22 Dec 2005 | British | 61 years |
| Roger Harold Potts | Director | 26 Jun 2001 | 17 Aug 2001 | British | 73 years |
| Secretariat Services Limited | Corporate Secretary | 5 Feb 2001 | 1 Sept 2005 | United Kingdom | - |
| William Robert Doughty | Director | 26 Aug 2004 | 2 Jan 2008 | British | 58 years |