Tony Mammoth's life is sweet until his boss and headteacher Mr Cowley is signed off from work with stress. With little sensitivity and thinking purely of maintaining his easy work life, he does whatever it takes to de-stress him and get rid of the younger, popular and eminently more professional temporary headteacher. 

Meanwhile, Mel arranges a big 18th-birthday party for Theo, who desperately wants his mum to stop treating him like a four-year-old. 

Mammoth turns into the protective father figure when Mel goes on a date with a new man, Matthew. But he quickly starts to adore him (mainly on a whim). Whilst trying to develop the world's strangest bromance, he takes his self-appointed role as head of PE very seriously until the pressure gets too much. 

Meanwhile, Mel isn't feeling it with Matthew, and Theo revels in his new bad-boy image. 

Following a panic attack, Tony Mammoth (briefly) decides to get healthy. At the gym, he's confronted by his nemesis, Terry Keane. His previous traumatic experience spurs him on to get revenge on Terry by signing up to a rival over-70s football team. With the help of Roger, he gets fighting fit to be ready for his day of destiny. 

Meanwhile, Mel decides to quit her job and follow her 'dream' - becoming a professional potter.