Gilbert in Oscar Wilde’s dialogue ‘The Critic as Artist’: ‘Every great man nowadays has his disciples, and it is always Judas who writes the biography.’ Not here. Hermione Lee’s immensely long Tom Stoppard: A Life is expert, engrossing, entertaining and sympathetic to its subject. At its heart is a writer steely in his determination to entertain, an inexhaustible mine of mots, a non-stop genius of jokes, capable of winning the Nobel Prize for the interview as an art form.