Doc Martin (2004)

Martin is shocked to find Louisa and Aunt Joan knocking at his door before the Surgery has opened. Louisa has had a medical scare and wants Martin's reassurance that everything is fine.

PC Penhale, still officially the world's worst policeman, has an unexpected visitor: the older brother Sam, who he has always idolised.

Trying to show off in front of his brother, Penhale injures a tourist, and when they take the tourist to Martin, Sam learns from Pauline that the Surgery needs re-painting. Sam volunteers for the job.

Martin and Edith go to a restaurant to discuss her medical research, which she wants Martin's help with. It isn't a date, but Edith teases Martin playfully. When she drops him off outside the surgery afterwards, Edith gives Martin a kiss.

Bert notices that Pauline is going stir-crazy living with Al, and tries to offer the younger man some relationship advice. But when Al tries to act on the advice, his ham-fisted efforts make the situation even worse.

Martin is called to the home of Mr Routledge who is complaining of chest pains. But Mr Routledge is a nuisance-caller and there's never anything wrong with him. Mr Routledge wants Martin to put him into a nursing home so he can be looked after all day long and Martin refuses.

Martin notices that Sam has some problems with his memory and co-ordination. It's probably just a virus, but when Martin takes Sam's family history, he decides there is a very small possibility that Sam has a rare genetic disease.

When Sam tells his brother, Penhale becomes convinced that he has the disease too and is going to die. Penhale takes his brother for a tearful farewell drink at the Crab & Lobster. However, Sam's blood tests reveal he doesn't have the genetic disease, but Martin diagnoses a different illness that will change Penhale's opinion of his brother forever.

Louisa visits Edith for a check-up, and Edith elicits a very personal and embarrassing piece of information from Louisa. Later, tired of renting, Louisa is looking for somewhere to live in the village. Aunt Joan suggests she visits Mr Routledge to ask him about his plans, but when Martin discovers Louisa there, something unexpected happens.