There are quite a few things that Tina Brown doesn’t know: what ‘jejune’ means; when Louis XIV came to the throne; what the passive voice in prose is (not ‘recollections may vary’); what members of the aristocracy are called (Lady Romsey becomes Lady Penelope Romsey) or what members of the royal family are called (the ‘Dowager Duchess of Gloucestershire’ puts in an appearance).Another