Paul Murton sets out to visit some of the many islands that lay off the coastline. Heading to Foula and Fair Isle - the most remote island communities in Britain - he makes a nerve-racking visit to 'Da Snekk o' da Smallie' - a pothole in the cliffs of Foula that leads through to the Atlantic shore on the island, and learns about the beautiful knitting patterns that have made Fair Isle famous around the word