| Adrian Harold Michael White | Director | 25 Jul 2000 | 23 Jul 2004 | British | 81 years |
| Alan Browning Mackay | Director | 13 Jul 2010 | 21 Dec 2011 | British | 64 years |
| Ian Marshall Kennedy | Director | 15 Dec 2023 | 23 Oct 2024 | British | 63 years |
| Lucy Sarah Paterson Millar | Director | 21 Dec 2011 | 22 May 2014 | British | 52 years |
| Maurice Gerard Quirke | Director | 3 Aug 2004 | 14 Dec 2007 | British | 66 years |
| Michelle Simone Green | Director | 14 Dec 2007 | 9 Jul 2008 | British | 59 years |
| Michelle Simone Green | Secretary | 25 Jul 2000 | 17 Jun 2004 | British | - |
| Nicholas Charles William Mustoe | Director | 13 Aug 2003 | 31 May 2006 | British | 65 years |
| Nicola Joyce Rutherford | Director | 9 Jul 2008 | 31 Dec 2010 | British | 51 years |
| Simon Robert Cunningham | Director | 10 May 2019 | 15 Dec 2023 | British | 48 years |
| Stephen Allen | Director | 1 Aug 2011 | 7 Aug 2015 | British | 65 years |
| Susan Deborah Leigh Flynn | Director | 6 Oct 2009 | 28 Jun 2010 | British | 70 years |
| Susan Jane Cane | Director | 7 Aug 2015 | 10 May 2019 | British | 68 years |
