Anyone who's spent time with New York's Upper East Siders, in real life or through an episode of Gossip Girl can tell you that for those for whom style is not a trend but a way of life the facts and rules of life are somewhat different. When the choice is between the relaxed luxury of a private towncar, and the alternative of standing on the kerbside flailing your arms in the hopes of stopping a road-going subway, the yellow cab just doesn't cut it.