| Andrew Richard Francis Twelves | Director | 14 Feb 1992 | 26 Mar 2001 | British | 88 years |
| Ewan Cairn Barclay Ross | Secretary | 3 Sept 2004 | 3 Jan 2006 | British | - |
| Hannah Katherine Harriman | Secretary | 14 Feb 1992 | 31 Dec 1991 | British | - |
| Hannah Katherine Harriman | Secretary | 14 Feb 1994 | 5 Feb 2003 | British | - |
| Helen Crapper | Secretary | 5 Dec 2014 | 15 Mar 2017 | - | - |
| Jennifer Karen Shadforth | Secretary | 15 Mar 2017 | 31 Mar 2021 | - | - |
| Katherine Ann Twelves | Director | 14 Feb 1992 | 31 Dec 1991 | British | 85 years |
| Louise Ann Walsh | Secretary | 3 Jan 2006 | 10 Nov 2008 | British | - |
| Michael Baldridge | Secretary | 1 Sept 2009 | 1 Oct 2010 | British | - |
| Paul Harriman | Secretary | 28 Feb 2013 | 5 Dec 2014 | - | - |
| Paul Harriman | Secretary | 5 Feb 2003 | 3 Sept 2004 | British | - |
| Rosalind Victoria Ward | Secretary | 10 Nov 2008 | 1 Sept 2009 | British | - |
| Shirley Ann Hazlewood | Secretary | 2 Oct 2010 | 28 Feb 2013 | - | - |
