This episode features hardcore surfing Thurso on Scotland's northern coast. It is a long way from shorts and bikinis but there is £60,000 prize money and a galaxy of international stars. Meanwhile Cameron McNeish is at the other end of Scotland on one of his favourite hills in the Borders, and returning to the the north coast is the Cape Wrath Challenge and the remarkable story of one man's fight against motor neurone disease.

Often described as the world's toughest race, each year nearly 400 men and women run up and down Britain's highest mountain in under 4 hours- and the fastest do it in one and a half. The Ben Nevis race started in 1895 and since then it's known knows no equal. We're also off to Tiree for the final event in the Windsurfing World Cup and discovering why in 1934 two canoists decided to paddle from Glasgow to Skye- with only a car inner tube for safety.