David Cameron.
Harold Macmillan became Prime Minster in January 1957.
He became Prime Minister on 27th June 2007
David Cameron became Prime Minister this year (2010)
Winston Churchill was British Prime Minister from May 1940 until July 1945 and again from 1951 until 1945
She became prime minister for the first time in 1960.
NEVER.
Tony Blair
Hitler was appointed Chancellor (the German equivalent of Prime Minister) in January 1933.
Hitler never became prime minister he became the Chancellor of Germany in 1933
Julia Gillard became Prime Minister in 2010.
The office of Prime Minister was never actually created, so there is some disagreement over who should be given the privilege of being the first Prime Minister of the United Kingdom. However, the honorary appellation is traditionally given to Sir Robert Walpole who became First Lord of the Treasury in 1721.Sir Henry Campbell-Bannerman became the first "actual" British prime minister in 1905. King Edward VII officially began recognizing the title that year.
May 1940