It's Portwenn Fun Day and the village is really looking forward to major fund raising event. PC Penhale enjoys rallying the runners and creating more support. There ends up being a rivalry between Bert Large and Mark. They are both want to take advantage of the day to boost their takings by providing food for the runners and spectators. After Mark's enterprise is closed by Martin after he diagnoses an infection which means he must not handle food, and bans him from going into the kitchen. Bert ends up seizing the chance to take over the ?soiree'. Louisa's mum Eleanor shows up in town unexpectedly and Louise isn't pleased to see her.
Make an appointment with the brilliant but socially awkward and neurotic Doc Martin. When Martin develops an aversion to blood, he abandons his career as a celebrated London surgeon and becomes the only doctor in a sleepy small town where his tactless manner soon has the whole town in an uproar.
Doc Martin - Mother Knows Best Synopsis and Schedule