This is based on a true story, just like Fargo. What lets the film down is the inability to find any Glasgow accents other than Compston. Between Irish and stage school Morningside it doesn't make for realistic viewing. If everyone with a posh accent slumming it had been shot the film would have been 15 mins. And Clare Grogan clearly was hoping for Ewan McGregor and not his uncle in a string vest. Best avoided unless you think drug dealers who want to protect 'civillians' are credible.