Countryfile this week visits the breathtaking coastline of Mount's Bay in Cornwall and explores the magical St Michael's Mount. Matt Baker is in for some extreme gardening as he abseils on the island's craggy cliffs, while Margherita Taylor takes to the water to meet the team of female gig boat rowers who are going for gold in the world championships.Charlotte Smith investigates how the UK's shortage of farm vets is threatening not just animal health but also our own. Adam's getting ready for the arrival of some very special calves. And, in the first of a series of five films, Adrian Chiles explores some of the fascinating customs from around the British Isles. Today, he's just along the coast in Mousehole and discovers an intriguing Cornish tradition or two.