Series 4 episodes are: 'Identitwit', 'The Pruning of Hedges', 'Viva La Revolution', 'A Rather Nasty Outbreak', 'David and Goliath', 'A.W.O.L.', 'What's a Class Between Friends?'. Hedges has the unenviable job of trying to teach the unruly class while also dealing with nosey caretaker Norman Potter (Deryck Guyler) who challenges his every move with rules and regulations and student Maureen Bullock