In this extract from his book Upland: A Journey through Time and the Hills author Ian Crofton describes the ascent of Ben Nevis made by the poet John Keats in 1818, with his friend Charles Armitage Brown. They had walked on foot all the way from London to Glasgow via the Lake District, where they had climbed Skiddaw, and from Glasgow made their way north, via Loch Lomond, to Fort William. A poet and a scientist on Ben Nevis ‘I have nothing of consequence to tell you,’ Keats wrote to his brother Tom on 3 August 1818, ‘till yesterday when…