Last night's was actually alright. I wasn't holding out much hope after the rather dire series 5. Definitely give it a chance, as I though last nights was pretty decent.
However, it was pretty obvious that the girl in Chris' bed would be a pupil. Although I didn't expect her to be the head's daughter. At least that might make for an interesting story, if/when the mother finRAB out, seeing as her and Chris seemed to have bonded.