We will never know if Samantha Cameron voted Labour in 1997, but there are other wives of prominent politicians that have done the unexpected in the privacy of the polling booth. Roy Hattersley reveals all:
His [Wilson’s] government had decided to let the people decide, through a referendum, if Britain should confirm its membership of the Common Market. After the Wilsons had returned to their ministerial car from the polling booth, Mary told her husband: "I couldn't do it. I just couldn't do it."
Wilson had voted for Britain to remain in Europe, and his wife had voted to come out. "He was very sweet about it," says Mary.
Asked if she still holds the same view, the best she can say about Britain's European destiny is: "You can't unscramble eggs."