Big School is an enjoyable comedy set in a school. It's quite funny with the last episodes of the first season (the exam & the school trip to France) being especially funny. The cast are great, yes the characters are quite exaggerated and the comedy is quite broad and often low brow (even a bit of toilet humour). The main character Keith Church (David Walliams) is a nerdy Chemistry teacher who has a crush on the French teacher Sarah Posterns (Catherine Tate). His rival for her affections is Trevor Gunn (Philip Glenister), the lecherous gym teacher who lives at home with his mother. Some of the other standout characters are the headmistress Ms Baron (Frances De La Tour) who breaks all the rules and the sad sack geography teacher Gareth Barber (Steve Spiers).