“The stars of Palme d’Or-winning drama Blue is the Warmest Colour have said that making director Abdellatif Kechiche’s film was ‘horrible’ … [They] said the Franco-Tunisian film-maker ranted and raved at them [throughout the project], … while a fight scene was the result of a continuous one-hour take during which Kechiche refused to allow his stars to simulate blows.”