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Lt-Rt: James Musgrave (Petya), Albie Marber (Kolya) and Lisa Diveney (Sasha), Donkey Heart by Moses Raine, Directed by Nina Raine, 7th-31st January 2015, Trafalgar Studios, 14 Whitehall, London, SW1A 2DY, Box office: 0844 871 7632, atgtickets.com