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 plans had been in development since 2014, but would help underline Britain as a "global player" following the Brexit result.
The number of calls about children suffering or witnessing emotional abuse or physical violence in the home has surged in recent years.
The curtain will come down on the show for the final time at the Piccadilly Theatre in March next year, before embarking on a UK tour.