Absolutely Brilliant!
The story, the mood, the cinematography, the acting.... everything was top-notch.
It was tense, thrilling, creepy and awfully sad. It definitely threw a few twists and turned it into a very unusual friendship story. I spent a lot of the movie trying to find out who creeped me out more, who was more despicable, and who was sadder. There's a dark, sort of heavy mood throughout the film, and there's a lot of tension and anticipation that "something bad is going to happen", which it ultimately delivers.
This movie definitely could have used some more promotion. I'd never heard of it. I only found it by looking for interesting UK movies.