Dougie sets out to climb Ben Nevis to mark 250 years since the first recorded ascent in 1771. With an endless stream of visitors climbing the mountain, he finds out about the pressures put on it and how it's being protected and looked after. Also in the hills, Professor Hayden Lorimer celebrates the achievements of one of Scotland's pioneering mountaineers, while Anne is in Lanarkshire at a farm that has become a fly-tipping hot-spot. And Arlene is in Ayrshire getting a taste of salt production the natural way.