| Agnes Christina Lynch | Director | 7 May 2003 | 6 Sept 2005 | British | 59 years |
| Alan David White | Director | 8 Oct 1992 | 16 Nov 2001 | British | 81 years |
| Alan George Scott | Director | 26 Nov 2003 | 30 Mar 2009 | British | 76 years |
| Alan Whitfield | Director | 1 Sept 1999 | 11 May 2001 | British | 72 years |
| Anne Louise Fletcher | Director | 24 Apr 2001 | 6 Mar 2003 | British | 67 years |
| Antony John Gara | Director | 25 Sept 2024 | 15 Apr 2025 | British | 52 years |
| Christina Bridget Ryan | Director | 24 Feb 2014 | 31 Mar 2025 | Irish | 66 years |
| Colin Raymond Green | Director | 8 Oct 1992 | 1 Sept 1999 | British | 77 years |
| Geoffrey Beedham | Director | 11 Feb 2010 | 11 Jan 2012 | British | 73 years |
| Geoffrey William Almeida | Director | 8 Oct 1992 | 8 Jan 1997 | British | 75 years |
| Graeme Alexander Robert Paton | Director | 11 Jan 2012 | 22 Mar 2013 | British | 57 years |
| Heather Gwendolyn Brierley | Director | 18 Sept 2002 | 1 Oct 2002 | British | 55 years |
| Heather Gwendolyn Brierley | Director | 6 Sept 2005 | 30 Mar 2009 | British | 55 years |
| Helen Louise Ashton | Director | 2 Apr 2001 | 8 May 2002 | British | 64 years |
| Ian Charles Jones | Director | 6 Jul 2004 | 6 Jan 2010 | British | 64 years |
| Ian Glover | Director | 7 Aug 2014 | 19 May 2021 | British | 63 years |
| James Michael Dow | Director | 8 Oct 1992 | 19 May 1994 | British | 79 years |
| John Ronald Pike | Director | 8 May 2002 | 7 May 2003 | British | 77 years |
| Judith Sasse | Director | 30 Mar 2009 | 1 Jul 2010 | German | 51 years |
| Katherine Mary Duffy | Secretary | 8 Oct 1992 | 10 Mar 1996 | British | - |
| Louise Alison Clare Blackwell | Director | 1 Jul 2010 | 24 Oct 2013 | British | 44 years |
| Michael Alexander Schraer | Director | 8 Jan 1997 | 11 Jul 1998 | British | 71 years |
| Michael Alexander Schraer | Director | 7 May 2003 | 6 Jul 2004 | British | 71 years |
| Michael John Cole | Director | 30 Mar 2009 | 28 Feb 2014 | British | 56 years |
| Paul Bayley | Director | 23 Nov 2001 | 7 May 2003 | British | 60 years |
| Paula Annette Walsh | Director | 23 Nov 2001 | 28 Jan 2002 | British | 61 years |
| Rebecca Margaret Peagram | Director | 11 Jan 2012 | 7 Aug 2014 | British | 57 years |
| Richard William Savage | Director | 10 Mar 1994 | 30 Jun 1995 | British | 76 years |
| Robert Paul Brace | Director | 8 Oct 1992 | 23 Nov 2000 | British | 76 years |
| Shona Virginia Playfair Cannon | Director | 23 Nov 2001 | 28 Jan 2002 | British | 73 years |
| Stephen John Prior | Director | 8 May 2002 | 6 Sept 2005 | British | 73 years |
| Stephen John Prior | Secretary | 8 Oct 1992 | 10 Mar 1996 | British | - |