It seemed very cliche'd to me - the staring eyes, the red hair, the music, the spooky children. Yawn!
Just reading the autobiography of David Mitchell (comedian not writer) and he knew Olivia Coleman very well as they were in Footlights together. He tells how her acting talent stood out even then. They all called her "Collie." There is hilarious scene where they are playing a gig at a posh girls' school and they get the giggles to the point where Collie wets herself and the wee trickles down the stage and over the edge - it is very funny.