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Colin Firth on Railway Man role

23 December 2013 Last updated at 07:25 GMT

Colin Firth is no stranger to hard-hitting films but he admits his latest role as a British prisoner of war was one of the biggest challenges of his career so far.

The Railway Man is a harrowing account of what life was really like for the Allied troops captured and imprisoned by the Japanese during World War Two

Charlie Stayt spoke to Colin Firth about how difficult it was to deal with sensitive subject matter.

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