It's Portwenn Fun Day and the village is buzzing with excitement about this major fund raising event. PC Penhale is in his element rallying the runners and whipping up support. The event sparks culinary rivalry between Bert Large who runs Large's restaurant with son Al and Mark, the landlord of the Crab and Lobster pub. They are both keen to take advantage of the day to boost their takings by providing food for the runners and spectators. Also, Louisa's mother arrives unexpected, And Martin and Louisa find their baby is sleeping through usual feeds until they find out her mother gave the baby some of her brew to calm it down.