| 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 | 12 Feb 2014 | British | 56 years |
| Andrew John Sutton | Director | 14 Feb 2003 | 11 Feb 2004 | British | 70 years |
| Andrew Richard Kershaw | Director | 19 Nov 2014 | 14 Sept 2020 | British | 61 years |
| Brian Mervyn Semple | Director | 22 Dec 2005 | 2 Jan 2008 | British | 80 years |
| Christopher John Blundell | Director | 2 Jan 2008 | 3 Sept 2012 | British | 60 years |
| David Jason Mcevedy | Director | 22 Dec 2005 | 2 Jan 2008 | British | 61 years |
| Emma Louise Lancaster | Director | 23 Sept 2020 | 25 Feb 2021 | British | 40 years |
| Gary Nelson Robert Honeyman Brown | Director | 3 Sept 2012 | 9 May 2017 | British | 51 years |
| Geoffrey Keith Howard Mason | Director | 15 Feb 2000 | 14 Feb 2003 | British | 72 years |
| Graham John Hutt | Director | 9 May 2017 | 31 Mar 2020 | British | 72 years |
| Henry Lafferty | Director | 15 Feb 2000 | 30 May 2000 | British | 73 years |
| Ian Richard Gethin | Director | 22 Dec 2005 | 2 Jan 2008 | British | 55 years |
| James Gowans | Director | 19 Jun 2014 | 19 Nov 2014 | English | 45 years |
| Julia Sarah Mccabe | Director | 3 Apr 2020 | 23 Sept 2020 | British | 56 years |
| Kenneth John Gill | Director | 30 May 2000 | 14 Feb 2003 | British | 71 years |
| Patrick Hugh Gardiner | Director | 14 Feb 2003 | 7 Jun 2004 | British | 77 years |
| Paul George Milner | Director | 7 Jun 2004 | 15 Jun 2004 | British | 65 years |
| Paul Mcculloch | Director | 8 Nov 2004 | 18 Dec 2006 | British | 61 years |
| Richard John Marshall | Director | 25 Feb 2021 | 1 Oct 2025 | British | 56 years |
| Richard Little | Director | 12 Feb 2014 | 1 Nov 2022 | British | 47 years |
| Robert Hugh Corrie Rees | Director | 22 Dec 2005 | 2 Jan 2008 | British | 65 years |
| Robert Nigel Johnson | Director | 11 Feb 2004 | 15 Jun 2004 | British | 68 years |
| Robert Sean Mcclatchey | Director | 31 Mar 2000 | 22 Dec 2005 | British | 61 years |
| Robin Geoffrey Gilbert Smith | Director | 31 Mar 2000 | 28 Jun 2002 | British | 82 years |
| Secretariat Services Limited | Corporate Secretary | 15 Feb 2000 | 1 Sept 2005 | United Kingdom | - |
| William Robert Doughty | Director | 26 Aug 2004 | 2 Jan 2008 | British | 58 years |