Quite enjoyed this great Brit film. Although there are Horror elements, I did not find them to be scary or creepy enough for my high standards of Horror definition. That said, there are definitely some moments that are a bit creepy but there is so much more going on in this film than silly "BOO!" moments. A refreshing storyline that explores much more than shown simply in the trailer (missing, possible dead child), there are instances of bullying, single-parent family dynamics, the question of faith, the depravity and sadness of those in mental institutions, possible mental illness...this film has a bit of it all. You will be questioning different people and situations throughout the film which I find particularly engaging and enticing in Thrillers that we do not always get to see. Watching it a second time is recommended...sometimes we miss certain important elements. The backdrop of the film's location reminded me of industrial Manchester and the people live in the area (common amongst London or other urban suburbs). The ending was not quite what I expected, but that is neither good nor bad. I can't say much more without revealing "spoilers"...
Definitely worth watching.