Rick Stein is on home territory in this episode as his journey around the coastline of the British Isles takes him to Cornwall. Rick also pops over to Guernsey and across the Bristol Channel to South Wales. The mouth of the River Fal is famous for its native oysters but the future for these creatures is threatened by the arrival of an interloper, the slipper limpet, which grows quickly by devouring vast quantities of the same microscopic food the oysters feed on. Doing his bit to redress the balance, Rick prepares a slipper limpet grilled with butter, garlic and parsley followed by roasted monkfish. At Newlyn, Rick combines the produce of Cornwall with some Italian flair by toasting some rustic bread, rubbing it with garlic then sprinkling virgin olive oil before flaking the flesh of some pilchards with vine tomatoes and sliced red onion. Over on the Channel Island of Guernsey, the rare ormer fish is revered as a delicacy that is slow-cooked in a casserole with beef stock, carrots and onions. Rick risks upsetting the islanders by instead choosing to serve them thinly sliced in a salad of shitake mushrooms, rice noodles, ginger and shredded spring onions.