So many people think this film glorifies the criminal youth sub culture. They are totally missing the point. Yes, the kids are merciless, violent thugs, but, they have an amazing capacity for heroism, love and generosity. The message? don't give up on these kids, they have a lot to offer. I found myself drawn to them as the film progressed. I'm not sure this is intended to be a sci-fi film in the same vein as Star Trek. The effects are very good, but the creatures are just there to draw the protagonists together. The real story is the interaction of the characters, the breaking down of social barriers and, most importantly, the eating of the bad guys. This is a film of hope, Britain is not necessarily on a one way trip down the toilet. These kids are going to save us!! Believe Bruv.........