| DUNCOMBE, Fiona Margaret ACTIVE | Secretary | 02 Jan 2013 | | | | 2-3, Pavilion Buildings, Brighton, East Sussex, BN1 1EE |
| CLARK, Anne Rosemary ACTIVE | Director | 01 Jan 2016 | | England | December 1964 | 2-3, Pavilion Buildings, Brighton, East Sussex, BN1 1EE |
| COWLARD, Mark Allan ACTIVE | Director | 21 Mar 2018 | | England | June 1969 | Arcadis House 34 York Way, London, N1 9AB, England |
| MADDEN, Peter Vincent ACTIVE | Director | 01 Jan 2015 | | England | July 1961 | 2-3, Pavilion Buildings, Brighton, East Sussex, BN1 1EE |
| DIXON, Peter Rae RESIGNED | Secretary | 07 Aug 1998 | 24 May 2000 | | | The Manor House, Rowberrow, Winscombe, Somerset, BS25 1QL |
| EAKINS, Simon Mark RESIGNED | Secretary | 01 Nov 2006 | 25 Aug 2009 | | | 4 Seymour Avenue, Bristol, Avon, BS7 9HJ |
| HUDSON, Peter Evason RESIGNED | Secretary | | 07 Aug 1998 | | | 37b Heathfield Road, Wandsworth, London, SW18 2PH |
| MCLEOD, Alasdair Simpson RESIGNED | Secretary | 24 May 2000 | 01 Nov 2006 | | | 47 Salisbury Road, Redland, Bristol, BS6 7AR |
| SMITH, Andrew Peter RESIGNED | Secretary | 19 Aug 2009 | 11 Jan 2013 | | | Echq, 34 York Way, London, N1 9AB, United Kingdom |
| ARNOLD, Leonard John Duncan RESIGNED | Director | | 30 Jun 1997 | Gbr | April 1941 | Midway Lady Margaret Road, Sunningdale, Ascot, Berkshire, SL5 9QL |
| BARRETT, Darren Roy RESIGNED | Director | 04 Jul 2011 | 15 Jul 2012 | United Kingdom | June 1969 | 10, Furnival Street, London, EC4A 1YH, United Kingdom |
| BARTLETT, Jeremy RESIGNED | Director | 30 Jun 1994 | 30 Apr 2001 | | April 1938 | 37 Wood Road, Codsall, Wolverhampton, Staffordshire, WV8 1DN |
| BROOKES, Alan Geoffrey RESIGNED | Director | 01 Mar 2014 | 21 Mar 2018 | England | November 1961 | Arcadis House, 34, York Way, London, N1 9AB, England |
| BROOKS, Keith Lawrence RESIGNED | Director | 01 Jan 2015 | 29 Feb 2016 | England | January 1966 | Arcadis House, 34, York Way, London, N1 9AB, England |
| CALVER, Graham John RESIGNED | Director | 07 Aug 1998 | 01 May 2002 | United Kingdom | June 1942 | Nielpahar, Hewelsfield, Gloucestershire, GL15 6UU |
| CARROLL, Michael Dennis RESIGNED | Director | 04 Jul 2011 | 15 Oct 2012 | United Kingdom | August 1953 | 10, Furnival Street, London, EC4A 1YH, United Kingdom |
| GOODBODY, Edward Arthur RESIGNED | Director | | 07 Aug 1998 | | October 1933 | Stockmans Rectory Hill, Amersham, Buckinghamshire, HP7 0BT |
| GOUDIE, Kenneth Patterson RESIGNED | Director | 07 Aug 1998 | 01 Jan 2011 | United Kingdom | January 1960 | 10, Furnival Street, London, EC4A 1YH, United Kingdom |
| HARVEY, John RESIGNED | Director | 30 Jun 1994 | 26 Mar 1996 | | July 1934 | 5 Rudd Hall Rise, Camberley, Surrey, GU15 2JZ |
| KAKUMOTO, Takashi RESIGNED | Director | 02 Apr 1997 | 07 Aug 1998 | | November 1955 | 9 Queens Drive, Acton, London, W3 0HF |
| MATSUMOTO, Yoshio RESIGNED | Director | | 23 Jun 1995 | | April 1942 | 4-9-18-707 Kitashinjuku, Shinjuku-Ku Tokyo, Japan |
| MCGAHEY, Andrew Michael John RESIGNED | Director | 01 May 2002 | 10 Nov 2006 | England | November 1958 | Michaelhouse, 2 Millington Road, Cambridge, CB3 9HP |
| NEAL, Timothy RESIGNED | Director | 25 Oct 2012 | 01 Mar 2014 | England | January 1967 | Echq, 34 York Way, London, N1 9AB, United Kingdom |
| ODONNELL, Noel Joseph RESIGNED | Director | 07 Aug 1998 | 01 Jan 2011 | United Kingdom | December 1954 | 10, Furnival Street, London, EC4A 1YH, United Kingdom |
| PORTER, Stephen Thomas RESIGNED | Director | 08 Jun 1995 | 07 Aug 1998 | | November 1946 | 22 Church Road, Hertford, Hertfordshire, SG14 3DP |
| SHIBATA, Masatoshi RESIGNED | Director | | 01 Aug 1995 | | February 1951 | Grove House 25 Pine Grove, London, N20 8LB |
| SMITH, Andrew Peter RESIGNED | Director | 12 Jul 2012 | 11 Jan 2013 | England | March 1969 | Echq, 34 York Way, London, N1 9AB, United Kingdom |
| SMITH, Antony Panayiotis RESIGNED | Director | 07 Aug 1998 | 01 Jan 2011 | United Kingdom | November 1954 | Somerset House, 18 Canynge Road, Clifton Bristol, BS8 3JX |
| SOGA, Akihiko RESIGNED | Director | 01 Aug 1995 | 07 Aug 1998 | | December 1954 | Tudor Heights Chislehurst Road, Chislehurst, Kent, BR7 5LD |
| SYKES, Anthony Peter Mark RESIGNED | Director | 07 Aug 1998 | 30 Nov 2009 | United Kingdom | November 1958 | Somerset House, 18 Canynge Road, Clifton Bristol, BS8 3JX |
| TAYLOR, Brian Ross RESIGNED | Director | 07 Aug 1998 | 01 Jan 2011 | United Kingdom | December 1959 | Somerset House, 18 Canynge Road, Clifton Bristol, BS8 3JX |
| TORIKAI, Kazutoshi RESIGNED | Director | 22 Apr 1996 | 02 Apr 1997 | | January 1947 | 606-1-2603 Kamitsuruma, Sagamihara-City, Kanagawa Prefecture Japan, FOREIGN |
| VINCE, Peter John RESIGNED | Director | 27 Jul 2010 | 31 Jul 2011 | United Kingdom | May 1958 | 10, Furnival Street, London, EC4A 1YH, United Kingdom |
| WALLACE, Eric Thornton RESIGNED | Director | 07 Aug 1998 | 30 Apr 2009 | England | December 1948 | Tring House, Bridgwater Road, Winscombe, Somerset, BS25 1NN |
| WILDGOOSE, Ian RESIGNED | Director | 26 Mar 1996 | 17 Dec 1996 | | August 1960 | 6 Flitch Lane, Great Dunmow, Essex, CM6 1EL |
| YAMAGUCHI, Yasuo RESIGNED | Director | 23 Jun 1995 | 22 Apr 1996 | | February 1941 | 3-14-406 Nishigokenchyo, Shinjuku Ku, Tokyo, 162, Japan |
| YOUELL, Philip Anthony RESIGNED | Director | 11 Jan 2013 | 01 Jan 2015 | England | December 1960 | Echq, 34 York Way, London, N1 9AB, United Kingdom |