David Cameron has pledged an in-out referendum on Europe in 2017, and says he will not lead the country if he cannot guarantee to provide the vote.
The prime minister's comments, made on BBC One's The Andrew Marr Show, suggest he would not lead a minority government should the Conservatives fail to secure a parliamentary majority at the 2015 General Election.
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The 29-year-old PR manager, who had appeared on Come Dine With Me, was killed days before leaving for a two-month trip to the US.
The Square has won the top prize of Palme d'Or at the Cannes Film Festival.
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