Every year the registrar of Public Lending Right issues a report on the authors whose books have been most often borrowed from libraries. You can be sure these days that Danielle Steel, Josephine Cox and James Patterson will be up there with the leaders, but it might be more interesting, I think, to discover the name of the author whose books we borrow most often from each other. We need more information about these delicate transactions between friends. I’d also like to know the title of the book which is most often borrowed and never returned, and I’d be disappointed to learn that it was something like A Sensible Guide to Home Plumbing or The Grouter’s Friend . . .