On 6 September 2016 it was reported that Focus Features would release the film in the United States on 24 November 2017, with Ben Mendelsohn (as King George VI) and Kristin Scott Thomas (as Clementine Churchill). As of 3 November 2016 Darkest Hour had begun principal photography. Also in November, it was reported that Dario Marianelli would score the film. On 8 November 2016, Stephen Dillane joined the cast. For his role as Churchill, Oldman spent over 200 hours getting make-up applied during the course of filming.
Stephen Dillane
Oldman