You might think that Jews, faced with a relentless campaign to ban their culture, would think once, twice, a hundred times, about instituting bans themselves. After they had thought about it, they would decide that, no, absolutely not, prudence as much as principle directs that they of all people must insist that art should be open to all. A good liberal idea, you might think. So good and so obvious there’s no need to say more.

For 40 years, ever since Jaws set box-office records and struck terror into the hearts of a generation, there’s been a counter-movement to rehabilitate the reputation of sharks. Marine scientists were appalled by the film, and have spent nearly half a century telling us that these sinister creatures are just misunderstood. Very few sharks are dangerous, they say. Do not be afraid! But I’ve dived with hundreds of sharks, and I’m scared of them.

As graduates of the country’s best university, most former Cambridge students neither seek nor expect much in the way of public sympathy. Last weekend, however, the frontrunner in the Labour leadership contest, Andy Burnham, attempted to elicit a little. Describing his journey from a Merseyside comprehensive to Cambridge as the thing which ‘brought me into politics’, he told of his bewilderment when, as a prospective English student, he was asked at his interview, ‘Do you see a parallel between The Canterbury Tales and modern package holidays?’ He was, he said, ‘still pondering what the question meant when I arrived at Warrington station six hours later and when the rejection letter dropped through the door’.