Wow. Chelsea, eh? He must have been makiing a bit of money. Working for the BBC? I bet that was when he made "the Sight." A few years ago now. Good to now he knows London well though.
He grew up in a really nice town in NJ (I grew up a couple towns over before we moved to western NJ). Then the town his family moved to when he was 15 was really, really, really, tony. For instance, Jackie Onasis Kennedy had her horse farm there. The houses are incredible. I have a feeling that Andrew learned well from his dad, who was an investment banker.
BTW, I know nothing about London. Is that a *nice* area (not sure how's it's phrased abroad)?