So Elon Musk, the world’s richest manchild, has changed the name of his favourite toy. Henceforth, Twitter is to be known as X. Strangely, though, you can still log on to twitter.com and be invited to tweet. This is a missed comic opportunity. Instead of the chancellor being able to say, for example, that he had tweeted his concern about the public sector borrowing requirement to the prime minister, he could be saying that he had “X’d Rishi” on the matter. Sigh. So what is it about Musk and X? Well, it goes back quite a way – to 1999,...