| Alan Paul Busson | Secretary | 15 Mar 2006 | 29 Sept 2006 | British | - |
| Alasdair Christopher Gillies | Director | 22 Jul 2003 | 30 Jun 2008 | British | 68 years |
| Amanda Louise Knott | Secretary | 29 Sept 2006 | 25 Jul 2013 | British | - |
| Ann Claire Blundell | Secretary | 25 Jul 2013 | 13 Mar 2014 | - | - |
| Corina Katherine Ross | Secretary | 10 Feb 2011 | 25 Jul 2013 | British | - |
| Graham Stuart Julian Baker | Director | 18 Oct 2017 | 12 Mar 2018 | British | 55 years |
| Helen Frances Leigh Rogers | Secretary | 14 Jul 2008 | 2 Dec 2011 | British | - |
| Iain James Trevor Evans | Director | 12 Mar 2018 | 2 Aug 2019 | Welsh | 54 years |
| Ian Ritchie | Secretary | 25 Jul 2013 | 13 Mar 2014 | - | - |
| Isla Rebecca Hale | Secretary | 22 Jul 2004 | 15 Mar 2006 | British | - |
| Jonathan Plumtree | Director | 20 Jun 2016 | 28 Feb 2017 | British | 60 years |
| Nigel Lowe | Director | 30 Jun 2008 | 30 Jun 2013 | British | 74 years |
| Peter Charles Howe | Director | 30 Jan 2001 | 22 Jul 2004 | British | 80 years |
| Peter Charles Howe | Secretary | 30 Jan 2001 | 22 Jul 2004 | British | - |
| Simon William Foster | Director | 22 Jul 2004 | 20 Jun 2016 | British | 57 years |
| Vincent John Jerrard | Director | 30 Jan 2001 | 22 Jul 2003 | British | 71 years |