| SEYMOUR, Antonia Karen ACTIVE | Director | 24 Oct 2019 | | England | April 1971 | Temple Circus, Temple Way, Bristol, BS1 6HG |
| ASHBY, John Henry, Dr RESIGNED | Secretary | | 29 Jun 1999 | | | 10 The Dell Waxwell Lane, Pinner, Middx, HA5 3EW |
| BRIGGS, Jonathan Richard, Dr RESIGNED | Secretary | 30 Jun 1999 | 12 Jun 2006 | | | 33 Wessex Gardens, London, NW11 9RS |
| WELHAM, Robert David RESIGNED | Secretary | 12 Jun 2006 | 24 May 2013 | | | 7 High Street, Saffron Walden, Essex, CB10 1AT |
| ASHBY, John Henry, Dr RESIGNED | Director | | 29 Jun 1999 | | July 1928 | 10 The Dell Waxwell Lane, Pinner, Middx, HA5 3EW |
| BARR, James Stephen RESIGNED | Director | 26 May 2015 | 01 Dec 2015 | United Kingdom | October 1956 | 1, Oliver's Yard, 55 City Road, London, EC1Y 1SP, England |
| BRAY, Michael Anthony RESIGNED | Director | 08 Mar 2004 | 24 May 2013 | England | September 1956 | 53 Grasmere, Trowbridge, Wiltshire, BA14 7LL |
| BRIGGS, Jonathan Richard, Dr RESIGNED | Director | 01 Jul 1999 | 12 Jun 2006 | United Kingdom | May 1966 | 33 Wessex Gardens, London, NW11 9RS |
| CALLAGHAN, Oliver David RESIGNED | Director | 01 Dec 2015 | 04 Jan 2024 | United Kingdom | February 1977 | Temple Circus, Temple Way, Bristol, BS1 6HG |
| COWHIG, Jeremy Robert RESIGNED | Director | 08 Mar 2004 | 05 Oct 2010 | England | October 1945 | 10 All Saints Road, Clifton, Bristol, BS8 2JJ |
| ERNST, Olaf, Dr RESIGNED | Director | 01 Dec 2015 | 20 Mar 2020 | England | September 1969 | Temple Circus, Temple Way, Bristol, BS1 6HG |
| GELBTUCH, Adam RESIGNED | Director | | 24 May 2013 | United Kingdom | January 1921 | 56 Aylestone Avenue, London, NW6 7AB |
| GIACHARDI, David John, Dr RESIGNED | Director | 18 Sep 2000 | 19 Aug 2002 | United Kingdom | May 1948 | Laburnum Cheverells Green, Markyate, St Albans, Hertfordshire, AL3 8RN |
| GOW, John Stobie RESIGNED | Director | | 20 Jan 1993 | United Kingdom | April 1933 | 19 Longcroft Avenue, Harpenden, Hertfordshire, AL5 2RD |
| GRAVES, Michael Richard RESIGNED | Director | 20 Aug 2002 | 08 Mar 2004 | | January 1957 | Rayments Farm, Wimbish Upper Green, Saffron Walden, Essex, CB10 2XJ |
| GREGORY, Peter Stuart RESIGNED | Director | 20 Aug 2002 | 08 Mar 2004 | | August 1962 | South Flat The Royal Society Of, Chemistry Science Park, Cambridge, CB4 0WF |
| HALL, Steven Richard RESIGNED | Director | 05 Oct 2010 | 05 Mar 2021 | England | March 1956 | Temple Circus, Temple Way, Bristol, BS1 6HG |
| HUTCHINS, Jamie Stuart RESIGNED | Director | 24 May 2013 | 17 Nov 2017 | England | June 1972 | Temple Circus, Temple Way, Bristol, BS1 6HG, England |
| INCH, Thomas David, Doctor RESIGNED | Director | 21 Jan 1993 | 18 Sep 2000 | | September 1938 | 16 Ashlands, Ford, Salisbury, Wiltshire, SP4 6DY |
| JACKSON, Katharine Mary RESIGNED | Director | 26 May 2015 | 01 Dec 2015 | United Kingdom | May 1964 | 1, Oliver's Yard, 55 City Road, London, EC1Y 1SP, England |
| KAZI, Abdur Raoof RESIGNED | Director | 24 May 2013 | 26 May 2015 | England | February 1936 | 3a, Livingstone Court, 55 Peel Road, Harrow, Middlesex, HA3 7QT, England |
| SHELOCK, Edwin Arthur RESIGNED | Director | | 31 Dec 2003 | | March 1926 | 11 Rue Georges Divenah, Hemonstoir, 22600 Loudeac, France |
| WELHAM, Robert David RESIGNED | Director | 12 Jun 2006 | 26 May 2015 | England | August 1937 | Temple Circus, Temple Way, Bristol, BS1 6HG, England |
| WELHAM, Robert David RESIGNED | Director | | 19 Aug 2002 | England | August 1937 | 7 High Street, Saffron Walden, Essex, CB10 1AT |