Nigel Lawson, Baron Lawson of Blaby, PC is a British Conservative politician and journalist. He was a Member of Parliament representing the constituency of Blaby from 1974 to 1992, and served in the cabinet of Margaret Thatcher from 1981 to 1989. Prior to entering the Cabinet, he served as the Financial Secretary to the Treasury from May 1979 until his promotion to Secretary of State for Energy. He was appointed as Chancellor of the Exchequer in June 1983, and served until his resignation in October 1989. In both Cabinet posts, Lawson was a key proponent of Thatcher's policies of privatisation of several key industries. Lawson oversaw the sudden deregulation of financial markets in 1986, commonly referred to as the "Big Bang".