| ZEITLER, Robert John ACTIVE | Secretary | 30 Jun 2025 | | | | 2222, Wellington Court, Lisle, IL 60532, United States |
| MELINIOTIS, Andreas Mark ACTIVE | Director | 30 Jun 2026 | | England | July 1981 | One, Prospect West, Bumpers Farm, Chippenham, SN14 6FH, England |
| SCHUMACHER, Charles Peter ACTIVE | Director | 30 Jun 2025 | | United States | July 1969 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH, England |
| BURRELL, Peter Frederick RESIGNED | Secretary | 19 Jul 2000 | 01 Jan 2015 | | | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| MEAKIN, Brian John RESIGNED | Secretary | | 04 Aug 1999 | | | Sussex Lodge, 5 Oakley Claverton Down, Bath, Avon, BA2 6DS |
| MURPHY, John RESIGNED | Secretary | 13 Sep 2016 | 30 Jun 2025 | | | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| WHITROW, Jane Elizabeth, Dr RESIGNED | Secretary | 04 Aug 1999 | 19 Jul 2000 | | | 40 Gun Lane, Knebworth, Hertfordshire, SG3 6BH |
| BLACKWELL, Christopher Paul, Dr RESIGNED | Director | 09 Jun 2004 | 01 Jul 2015 | England | December 1961 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| DAVIES, David James Geler, Professor RESIGNED | Director | | 09 Jun 2004 | | July 1937 | Dynevor Bathampton Lane, Bathampton, Bath, Bath And North East Somerset, BA2 6SJ |
| DERODRA, Mehul Andrew RESIGNED | Director | 10 Jun 2016 | 31 Jul 2018 | England | November 1966 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| DOWNIE, William RESIGNED | Director | 05 Feb 2020 | 31 Mar 2022 | England | January 1967 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| FRY, Paul Andrew RESIGNED | Director | 30 Jun 2019 | 31 Mar 2022 | England | December 1966 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| GANDERTON, David, Prof RESIGNED | Director | | 09 Jun 2004 | | August 1935 | Crooked Chimneys, Cheriton Bishop, Exeter, Devon, EX6 6JL |
| GOUGH, David Anthony RESIGNED | Director | 04 Aug 1999 | 01 Feb 2000 | United Kingdom | December 1949 | 2 Church Lane, Little Eversden, Cambridge, Cambridgeshire, CB3 7HQ |
| HYLAND, Anne Philomena RESIGNED | Director | 23 Apr 2002 | 01 Jul 2013 | England | August 1960 | One Prospect West, Chippenham, Wiltshire, SN14 6FH, England |
| KEEN, Peter Stephen RESIGNED | Director | 04 Aug 1999 | 23 Apr 2002 | United Kingdom | August 1957 | 26 Manor Road, Hemingford Grey, Huntingdon, Cambridgeshire, PE28 9BX |
| KNOWLES, Elizabeth Teresa RESIGNED | Director | 31 Mar 2022 | 31 Jul 2023 | United Kingdom | October 1984 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| MARRIOTT, Christopher, Prof RESIGNED | Director | | 04 Aug 1999 | | October 1944 | 4 Badgers Dean, Rodmell, Lewes, East Sussex, BN7 3HS |
| MEAKIN, Brian John RESIGNED | Director | | 04 Aug 1999 | | October 1935 | Sussex Lodge, 5 Oakley Claverton Down, Bath, Avon, BA2 6DS |
| MURPHY, John RESIGNED | Director | 31 Mar 2022 | 30 Jun 2025 | United Kingdom | May 1953 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| MURPHY, John RESIGNED | Director | 31 Jul 2018 | 05 Feb 2020 | United Kingdom | May 1953 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| OAKLEY, Andrew John RESIGNED | Director | 01 Jan 2015 | 10 Jun 2016 | England | April 1962 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH, England |
| OLIVER, Paul Stephen RESIGNED | Director | 01 Jul 2013 | 01 Jan 2015 | England | March 1978 | One Prospect West, Chippenham, Wiltshire, SN14 6FH, England |
| PHILLIPS, Trevor Michael, Dr RESIGNED | Director | 01 Sep 2012 | 31 May 2017 | England | May 1961 | One Prospect West, Chippenham, Wiltshire, SN14 6FH, England |
| STANIFORTH, John Nicholas RESIGNED | Director | | 09 Jun 2004 | | October 1953 | 170 Bloomfield Road, Bath, Avon, BA2 2AT |
| STEVENS, Malcolm Francis Graham, Prof RESIGNED | Director | | 04 Aug 1999 | | June 1938 | Shepshed Fields Farm House, Rempstone Road Belton, Loughborough, Leicestershire, LE12 9XA |
| WARD-LILLEY, James Alexander RESIGNED | Director | 01 Oct 2015 | 30 Jun 2019 | England | February 1965 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |
| WILLIAMS, Chad Martin RESIGNED | Director | 09 Aug 2023 | 30 Jun 2026 | United Kingdom | November 1973 | One, Prospect West, Chippenham, Wiltshire, SN14 6FH |