Iain tours the Scottish Highlands, the Southern Uplands, the Lake District and Snowdonia. He seeks elusive patches of snow in wild and inaccessible locations. He has developed his expertise with research ecologist Dr Adam Watson. And he writes about how these patches of snow have fascinated travellers and writers for hundreds of years. He reflects on the impact of climate change. He has had his imagination captured by these patches of snow since his first encounter with them at nine years old.