Boscawen served during 1947 and 1948 in Hamburg, West Germany, with the British Red Cross civilian relief teams organised by his mother, Lady Falmouth, a vice-chairman of the Conservative Party. From 1948, he spent two years with Shell Petroleum as a management trainee before joining the family-owned Cornish china clay business, Goonveen, at Rostowrack. He became a Lloyd'sunderwriter in 1952. Boscawen's party political career began in 1948 when he joined the Young Conservatives. Boscawen contested Falmouth and Camborne in elections in both 1964 and 1966, achieving a swing to the Conservatives but not enough to win, and was subsequently deselected because of his support for the right-wing Monday Club: local party activists thought his membership of the Club would harm his ability to appeal to a traditionally radical-leaning seat. For thirteen years, from 1970 until 1983, he was the member for Wells and then, as the result of boundary changes, his constituency became Somerton and Frome, which he held for a further nine years, from 1983 to 1992. In Parliament, Boscawen was noted for his right-wing views. He supported the restoration of capital punishment and drastic cuts in the welfare state and student grants but opposed abortion. He also became a leading supporter of Ian Smith after Rhodesia's Unilateral Declaration of Independence. He voted against the imposition of sanctions in defiance of the Party Whip. He was also initially opposed to Britain's entry into the European Common Market but later tentatively supported it, warning opponents against using war memories to make decisions affecting future generations. Boscawen was interested in the National Health Service and sat on its London Executive Council from 1954 to 1965. Also, he was on the backbenchers' Health Services Committee and vice-chairman from 1974 to 1979. He was scathing about attempts to raise MPs' pay in 1976 at a time of financial hardship for many, saying it "brought ignominy" on the whole House. Boscawen served as an assistant whip from 1979, as a Lord Commissioner of the Treasury from 1981, and then Vice Chamberlain of Her Majesty's Household 1983-86 and finally Comptroller of the Royal Household until 1988. He became a member of the Privy Council in 1992, in the same year that he retired from the House of Commons.
Personal life
Boscawen married Mary Codrington in 1949 and they had two daughters and one son, who followed him into the Coldstream Guards. They lived at Ivythorm Manor in Street, Somerset. Boscawen was a rower and yachtsman. He stroked the Trinity boat and rowed in the University trial eights. He was a member of the Royal Yacht Squadron and regularly sailed in international races, including the Fastnet. Boscawen died on the Isle of Wight on 28 December 2013.