For some reason you don’t expect people to be fans of the Mitford sisters, as others are fans of Doctor Who or Justin Bieber. But just in case this subset of humanity does exist, we have The Mitford Girls’ Guide to Life (The History Press, £12.99). Lyndsy Spence’s elegant little hardback is a compendium of all things Mitford, from family nicknames (‘Sir Ogre’ for Sir Oswald Mosley) and fashion tips (tweed skirts only on weekdays) to Pamela’s household hints (‘choose an aga to match one’s eyes’) and Diana’s guide to prison life (take a fur coat to use as a...