see more

A cleaner polishes the door of number 10 Downing Street in London on March 30, 2015. British Prime Minister David Cameron will on March 30 ask Queen Elizabeth II to dissolve parliament, kicking off formal campaigning for one of the most unpredictable elections in decades. AFP PHOTO / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

A cleaner polishes the door of number 10 Downing Street in London on March 30, 2015. British Prime Minister David Cameron will on March 30 ask Queen Elizabeth II to dissolve parliament, kicking off formal campaigning for one of the most unpredictable elections in decades. AFP PHOTO / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)