A homeless Mr Barber spends the night in the school, only for disaster to strike when he causes a fire in Miss Postern's classroom. It falls on the reluctant Mr Gunn to put a roof over his head. The disaster is good news for Mr Church, as Miss Postern moves into his laboratory while her room is redecorated - but they soon find sharing doesn't come naturally.
Elenco: Catherine Tate , David Walliams , Frances de la Tour , Philip Glenister , Steve Speirs .