Taxes, government debt, violent crime and the cost of living are all at record highs. This is no place for the wealthy and successful. Or so everyone’s saying these days in Chelsea, Notting Hill and Mayfair, between Pilates, property valuations and prepping for the next half-term escape. And yes, I have several wealthy acquaintances who have recently upped sticks. A friend from university, now a partner at a private equity firm with a stake in a Premier League football team, put his children in boarding schools in Berkshire