Naomie Harris says Nelson Mandela's ex-wife gave her a carte blanche to 'play me as you see fit' in the film Long Walk to Freedom.
Speaking to TV Africa Correspondent Rohit Kachroo at the film's premiere in Johannesburg, Harris said she found the conversation with Winnie Mandela "liberating".
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The chancellor now faces the prospect of forming a minority government or calling for a snap election.
The 73-year-old said a return is unlikely "given the politicised atmosphere that seems to have afflicted our set."
Chancellor Philip Hammond said the UK will make a financial proposal to the EU in the next three-and-a-half weeks.