British Prime Minister David Cameron gets in a car as he leaves 10 Downing Street in London, to visit Britain's Queen Elizabeth II, Monday, March 30, 2015. Cameron paid a farewell visit to Queen Elizabeth II on Monday, the first day of formal campaigning for the most unpredictable U.K. election in decades. The royal audience o possibly Cameron's last as prime minister o came as Britain's Parliament was dissolved ahead of the May 7 vote. (AP Photo/Matt Dunham), APTOPIX