Margaret Thatcher Foundation in 2006, where she established the Margaret Thatcher Center for Freedom. Margaret Thatcher Margaret Hilda Thatcher, Baroness Thatcher, (; 13 October 19258 April 2013) was a British stateswoman who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold that office. A Soviet journalist dubbed her "The 'Iron Lady, a nickname that became associated with her uncompromising politics and leadership style. As Prime Minister, she implemented policies known as Thatcherism.
Records of Prime Ministers of the United Kingdom returning in that of 1950 more than four years later. Of parliamentary constituencies that have been represented, none have been represented by more than one serving Prime Minister. Four future Prime Ministers sat for Newport, Isle of Wight (constituency abolished 1832): Lord Palmerston and Sir Arthur Wellesley (later the Duke of Wellington) in 1807–09, George Canning in 1826–27 and William Lamb, later Lord Melbourne in April–May 1827. It is rare for veteran Prime Ministers sitting in the Commons to lose seats through electoral defeat at subsequent general elections. Those who have are: Five Prime Ministers through longest unbroken service became