I am deeply grateful to the following people for their advice and help: Giles Andreae, Kate Lawson and Sarah McDougall. In particular I must thank my illustrator Sandra Howgate, my agent, Peter Straus, my excellent editorial team at Penguin – my editor Georgina Laycock and Ruth Stimson and Helen Conford, and once again my collaborator Mark McCrum for his invaluable work on the text.