David Walliams and Catherine Tate return in this comedy set in an urban secondary school. It may be the start of a new year at Greybridge, but the teaching staff are as dysfunctional as ever. Miss Postern and Mr Church's relationship has taken a downward turn after a misunderstanding over a date; the woefully under-qualified Mr Gunn is now teaching geography; and Mr Barber's got a new job as the school caretaker. This year the teachers are joined by a host of guest stars, including Morgana Robinson as author Fenella Forbes and Jimmy Akingbola as the dashing new geography teacher Dr Dalton.