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It had previously been reported that the film was struggling to secure a distribution deal, prompting an online campaign from fans of the Harry Potter actor.
Producer Simon Bosanquet told BBC News: "With a lot of independent films, it is hard to get them noticed.
"Rupert Grint has a very dedicated fanbase and it was very much down to them that this started."
Regarding scenes of sex and drug-taking in the movie, he added: "The film is a lot more than that.
"I suppose the interest of certain tabloids tends to be focused on areas where they can see Rupert playing characters unlike the ones he has played before."
The release date is yet to be confirmed but is likely to be in the first half of next year.
Agent The Little Film Company is also in talks with an American distributor regarding a US deal for the movie.
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