Poppy is a primary school teacher in North London and an incurable optimist. Not everyone can handle her relentless cheerfulness: many find her too loud, and some think she’s downright mad. Least of all her grumpy driving instructor Scott, who takes her good mood as a provocation. Poppy meets his control freakery and cynicism with calm, which only drives Scott further up the wall. Until one driving lesson pushes even Poppy to her limits …