Peter Mullan has joked he will "redefine" singing in his new film Sunshine On Leith.
The Scottish star will belt out some Proclaimers songs as he takes the lead role in Dexter Fletcher's big-screen musical adaptation, featuring Proclaimers hits including I'm Gonna Be (500 Miles), I'm On My Way and Letter From America.
"I'm going to redefine singing as you know it. My voice is so different - you'll never hear a singer quite like it," he said.
Jane Horrocks plays his screen wife, while Jason Flemyng also stars in the film.
"I've got one song to my lovely wife, who is played by Jane Horrocks, and it's a love song telling her how much I love her. But my voice is different - I ain't no singer, let's put it that way," joked Peter.
The 53-year-old - who appears in Eran Creevy's stylish thriller Welcome To The Punch and has starred in Paddy Considine's Tyrannosaur, Steven Spielberg's War Horse and the last two Harry Potter films - enjoyed working with the cast.
The story, which has been written by Stephen Greenhorn, follows two friends as they return home to Leith from the army.
"We had a genuine ball. I had never worked with Jason before and we had a really good laugh, it's the way a film set should be. You should enjoy it no matter how dark or how light the subject may be," said Peter.
:: Welcome To The Punch opens in cinemas on March 15.