Doc Martin (2004)

Doctor Ellingham raises the ire of the Portwenn community when he suggests the water supply may be to blame for an outbreak of violent diarrhea in the vilage.

Dr Martin Ellingham makes his debut on the local radio station, Radio Portwenn. He's not a natural in front of the microphone, and the interview is like pulling teeth for presenter Caroline. She's furious with his monosyllabic answers to her questions.

Bert Large is in dispute with his son Al over his future in the plumbing business. Al desperately wants to change career. He's determined to go to college to learn about computers and break away from the family business. His father won't hear of it.

Their row prompts Al to move out, breaking his dad's heart. Bert shares his woes with Martin, who tells him he fell out with his father too, and still doesn't speak to him.

Meanwhile, a nasty stomach bug is sweeping through Portwenn. People are dropping like flies, and filling Martin's surgery. The local pharmacist has been busy with customers seeking remedies, and he suspects the local swimming pool is too blame. Further investigations, however, suggest the village's water supply is the culprit.

After going back on air with Caroline to warn people to be careful, Martin feels the villagers' ire: a water scare a few years previously caused tourism to slump. People lost their jobs, their homes, and one resident even hanged himself.

Bert is soon round, agreeing with Ellingham about the suspicious local water, which he claims "eats through pipes". But could there be another source for the outbreak?