One of the by-products of our great metropolis being the City of the World - which London surely is now - is the ease with which people can, like Doctor Who, regenerate themselves. They can ditch their nationality, their past, and become part of whichever community they want to identify with. Our past can be a swamp that swallows us - but in London you can bury the past if you want to. Most of the time it does our city a power of good: it is a driver of change and a creator of energy, which sets us apart from more lethargic capitals such as Vienna or Paris. But there is a downside - namely, that it does from time to time open the door to a few dubious characters, most of them admittedly more silly than sinister. It would be unfair to mention any names, but we've all seen rich, ambitious Americans clambering through London's social elite, chequebook in hand, buying associations that they can use back home to gain social acceptance. (Indeed I saw more than my fair share during my years at the Palace.) But it's pretty harmless, mainly because we all know what's going on, don't really take it seriously and the London media provide a steady critical commentary of their ups and downs. And if they enrich our charities as a result, fine.