Margaret Thatcher telephoning Malcolm Fraser, PM of Australia, 10 Downing Street, London, UK, 1979 (photo)

Margaret Hilda Thatcher, Baroness Thatcher, LG, OM, PC, FRS (née Roberts, 13 October 1925 – 8 April 2013) was the Prime Minister of the United Kingdom from 1979 to 1990 and the Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British Prime Minister of the 20th century and is the only woman to have held the office. A Soviet journalist called her the "Iron Lady", a nickname that became associated with her uncompromising politics and leadership style. As Prime Minister, she implemented policies that have come to be known as Thatcherism On the 50th Anniversary of the first telephone call between Britain and Australia, the prime minister, Mrs.Margaret Thatcher takes a celebratory call from the Australian Prime minister, Mr. Malcolm Fraser.