There are three good reasons to visit Cromford in Derbyshire. First, Richard Arkwright’s cotton mills on the edge of the hamlet were the birthplace of the factory system. Second, the nearby John Smedley shop, itself a survivor from the late eighteenth century, sells the finest woollen and cotton pullovers in the world. Third, the Scarthin bookshop boasts a cafe hidden behind a revolving bookshelf. Finally, my old history professor has edited a cracking volume of essays about Cromford’s role in the Industrial Revolution.