| Alan John Frost | Director | 30 Jul 1998 | 30 Jun 2000 | British | 82 years |
| Andrew Chapman | Director | 28 Mar 1994 | 10 Mar 1998 | British | 74 years |
| Andrew Stewart Carter | Director | 3 Apr 2002 | 21 Jun 2021 | British | 66 years |
| Bernadette Clare Barber | Secretary | 2 Apr 2002 | 3 Jun 2005 | British | - |
| Brian Henry Peters | Director | 1 Jan 1992 | 3 Nov 1993 | British | 93 years |
| Catherine Rebecca Read | Director | 11 Jan 2018 | 30 Sept 2021 | British | 46 years |
| Christopher Martin Phillips | Director | 30 Jun 2000 | 19 Sept 2003 | British | 70 years |
| David Callum Hughson | Director | 3 Apr 2002 | 31 Dec 2004 | British | 67 years |
| David James Alexander Severs | Secretary | 4 Jan 1999 | 8 Feb 1999 | British | - |
| David John Amos | Director | 16 Dec 1999 | 30 Jun 2000 | British | 76 years |
| Fenton Renwick Talbott | Director | 1 Nov 1991 | 3 Nov 1993 | Us | 85 years |
| Francis Alan Crayton | Director | 13 Aug 1997 | 31 Dec 1998 | British | 75 years |
| Francis John Webster | Director | 6 Jan 1997 | 17 Jul 1997 | British | 79 years |
| Frank Lloyd Skillern Jnr | Director | 1 Nov 1991 | 1 Nov 1991 | American | 90 years |
| Gareth Richard Stewart Dickinson | Director | 17 Aug 2009 | 31 Dec 2013 | British | 56 years |
| George Petrie Robertson Mack | Director | 3 Nov 1993 | 6 Feb 1998 | British | 81 years |
| Guy Jonathan Gibson Phillips | Secretary | 28 Apr 1992 | 3 Nov 1993 | British | - |
| James Smith Burns | Secretary | 3 Nov 1993 | 4 Jan 1999 | British | - |
| Jane Heather Coffey | Director | 1 Jan 2005 | 19 Feb 2013 | British | 63 years |
| John Instance | Director | 3 Nov 1993 | 19 Oct 1995 | British | 72 years |
| John James Mclachlan | Director | 3 Nov 1993 | 31 Aug 1999 | British | 84 years |
| Jonathan Platt | Director | 22 Sept 2003 | 28 Jul 2017 | British | 64 years |
| Julia Helen Martin | Director | 1 Jan 2005 | 10 Aug 2007 | British | 64 years |
| Michael John Yardley | Director | 30 Jun 2000 | 14 May 2010 | British | 70 years |
| Murray John Ross | Director | 10 Jul 2000 | 3 Apr 2002 | British | 79 years |
| Murray John Ross | Secretary | 1 Jun 2000 | 2 Apr 2002 | British | - |
| Neil George Taylor | Director | 1 Nov 1991 | 7 Jan 1992 | American | 71 years |
| Nicholas John Gardner Hayes | Director | 1 Nov 1991 | 3 Nov 1993 | British | 72 years |
| Nora Agnes O'mahony | Director | 13 Nov 2019 | 31 Jul 2021 | Irish | 59 years |
| Paul Anthony Gilbert | Secretary | 10 Aug 1999 | 31 May 2000 | British | - |
| Paul Dieter Schmidt | Director | 2 Dec 2003 | 23 Jan 2006 | British | 57 years |
| Paul Doran | Director | 25 Aug 2005 | 16 May 2008 | British | 67 years |
| Paul Russell Moore | Director | 1 Nov 1991 | 3 Nov 1993 | British | 68 years |
| Piers Adrian Carlyle Hillier | Director | 26 Mar 2015 | 28 Jul 2017 | British | 58 years |
| Rakesh Kumar | Director | 20 Jun 2017 | 6 Oct 2025 | British | 46 years |
| Richard Edwin Balding | Director | 3 Nov 1993 | 6 Jan 1997 | British | 79 years |
| Richard James | Director | 3 Apr 2002 | 31 Dec 2017 | British | 62 years |
| Robert Arthur Daniel Williams | Director | 10 Jul 2013 | 26 Apr 2024 | British | 55 years |
| Robert Edwin Talbut | Director | 22 Nov 2004 | 31 Dec 2014 | British | 66 years |
| Seamus Martin Anthony Hughes | Director | 30 Jun 2000 | 31 Aug 2002 | Irish | 61 years |
| Simon Tudor Ellen | Director | 1 Sept 1999 | 18 Oct 2000 | British | 77 years |
| Valerie Patricia Delay | Secretary | 1 Nov 1991 | 27 Apr 1992 | British | - |
| Victoria Anne Muir | Director | 17 Aug 2009 | 28 Feb 2014 | British | 55 years |
| William Alfred Smith | Director | 1 Nov 1991 | 3 Nov 1993 | American | 78 years |
| William Moir Mcdonald | Director | 6 Jan 1997 | 30 Jun 2000 | British | 75 years |
| William Moir Mcdonald | Secretary | 9 Feb 1999 | 9 Aug 1999 | British | - |