Line of Duty star Kelly Macdonald has opened up about the importance of using an anglicised Scottish accent in her new movie Operation Mincemeat.

The actress plays the role of Jean Leslie in the historical war drama, which follows the titular operation that saw British intelligence disguise the body of a tramp as Captain William Martin to make Germany think their next target was Greece.

Macdonald spoke about her role and the way she approached her character in an exclusive new chat with Digital Spy, noting the importance of depicting a wider array of British people rather than just white English men.

kelly macdonald as jean leslie, operation mincemeat
See-Saw Films Limited/Warner Bros.

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"These stories have been told historically with white English men in a room talking about the war," she explained. "Jean wasn't written as Scottish, but I was quite keen for her to be a very educated Scot.

"The accent I'm doing is actually an anglified Scottish accent and I think that was important as much as having women in the room. British people are not just from London."

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Elaborating further on preparing for the part, Macdonald said that it's "always really the script".

kelly macdonald as jean leslie and matthew macfadyen as charles cholmondeley, operation mincemeat
See-Saw Films Limited/Warner Bros.

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"I've never really played anybody where I've had to do an extraordinary amount of research. It's all there in front of you," she added. "Jean Leslie was a real person, but I'm playing a version of a lot of the women that were in that room.

"There was just so much secrecy involved, so there's not much known because she wouldn't have been talking. People were involved in this incredible, in the true sense of the word, piece of espionage from history, but nobody really spoke about it.

"It must have been an exciting room to have been in. It's like the Halcyon Days, to have life go on and nobody would know about this stuff."

Operation Mincemeat is released in UK cinemas on April 15.

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