Eden Lake (UK, 2008)
Fair to good British shocker, in the mould of several recent horror movies set in the Australian Outback (director Watkins wrote one of these: GONE). A Middle Class couple leave London for a trip in the countryside, and are soon bullied by a group of Working Class hooligans (their leader looks like ManU player Rooney).
A bit slow (and not really atmospheric) at first, too many red herrings, and an overall lack of subtlety, but once first time director Watkins has his story on track, you're in for a rough ride through hell
Great surprise ending
Seems like Watkins wants to make a point about British class society, and (the lack of) education working class youngsters get (at home). Would be interesting to hear what the Brits among us make of this movie (and Watkins message).
Edit: the director probably wanted to emphasize the opposition between the South and North of England too. The couple is from London, the hooligans from the North.