James McAvoy is a very bad cop indeed in Baird's relentlessly grimy, brutal screen adaptation of Irvine Welsh's misanthropic novel. McAvoy's coke-, booze- and sex-addled DS Bruce Robertson is trying to lie and cheat his way up the Edinburgh rozzers' career ladder. It's a powerhouse performance and there's sterling support from the likes of Eddie Marsan and Shirley Henderson but, lacking the warmth and humour of, say, Trainspotting, it's a gruelling experience.