If you like gritty films, give this a watch. Just finished watching it and thoroughly recommended.

It's about a lad out of the army, goes to become a prison officer but gets mixed up with interesting people but it's got a good twist at the end. Not the usual cockney gang movie style, such as Snatch and lock stock, more of an interesting social commentary on life inside, both as a guard and a convict (sometimes you can't tell which is which!)

If you liked kidulthood, and adulthood, it's also got Noel Clark in it. Think he was in Harry Brown as well, with Michael Caine. Another good british film...