Margaret Thatcher Autograph on CardAn excellent signature from British prime minister Margaret Thatcher Serving three consecutive terms in office, 1979 1990, Margaret Thatcher (1925 ) was the UK's first female prime minister. She received the nickname "Iron Lady" for her forceful political rhetoric. Thatcher's policies reduced inflation, lowered taxes and reduced social expenditure. Her ideological support of free market economies helped foster a friendship with the United States'