"If one keeps on walking, everything will be alright." So said Danish writer Soren Kierkegaard, and so thought philosophy buff Gary Hayden as he set off on Britain's most challenging trek: to walk from John O'Groats to Land's End. But it wasn't all quaint country lanes, picture-postcard villages and cosy bed and breakfasts.

In this humorous, inspiring and delightfully British tale, Gary finds solitude and weary limbs bring him closer to the wisdom of the world's greatest thinkers. Recalling Rousseau's reverie, Bertrand Russell's misery, Plato's love of beauty and Epicurus' joy in...