Sam Riley has admitted that he initially had doubts about his new film Brighton Rock.
The actor stars as Pinkie in the big-screen version of Graham Greene's novel, which was first adapted for film in 1947 with Richard Attenborough in the lead role.
"My first reaction was, 'Are they just wanting to do Brighton Rock meets Heartbeat or something?'" the 31-year-old said.
Sam, who has been cast alongside Andrea Riseborough in the film, met the movie's director, Rowan Joffe, and realised it "wasn't a gimmick".
The actor, who made waves when he was plucked from obscurity to play Ian Curtis in Control in 2007, said he was nervous about a particular scene in Brighton Rock.
"There was a long scene on the pier that was five pages [of the script] and I was very nervous about doing that because I'd never really said anything in any movies I'd been in. I've sung or smoked, that's my forte."
But Sam said: "Instead of shouting in front of everyone, he'd (the director) come up to me and say, 'That was great but...' and whisper it in my ear."
He said of acting with greats like Helen Mirren and John Hurt in the new film: "There might be doubts beforehand and you think, 'Oh my God', but if you start thinking about that when you're actually acting then you're buggered."
Sam, who is also about to star in On The Road with Twilight's Kristen Stewart, recalled: "I had to say to Helen: 'Leave us alone you old bitch' and she just turned and said: 'Less of the old'. It completely threw me".