Countryfile: Portland

Countryfile is on the Isle of Portland, off the Dorset coast. Matt Baker visits Portland's three lighthouses. One is now a bird observatory, one the former home of birth control pioneer Marie Stopes, and one is still in use today. Julia Bradbury explores the famous Portland stone quarries on the isle. She sees how sculptors are now making the most of the stone, and how groundbreaking camera techniques are helping with the conservation of the area. John Craven is also on the isle, going out to sea with a tug boat captain in the harbour. Adam Henson finds out how to be a dog's best friend with the help of a dog nutritionist, who gives Adam the lowdown on how to keep our furry friends in tip-top condition