I moved from Oxford to London five years ago. In comparison to Oxford (and my previous hometown of Portland, Oregon), there were hardly any cyclists and the drivers seemed outright homicidal. I didn't get onto a bike during my first few years here. But lately I've noticed that things seem to be improving tremendously. There are a lot more cyclists on the road, and driver behaviour seems distinctly less homicidal than before. I'm really encouraged by these trends.
Actually, London is improving on almost every front. My chief complaints when I moved here were the scarcity of good coffee, the total absence of burritos, and the lousy cycling conditions. Now there are "cycle highways" growing like kudzu out of the city centre, and you can't throw a rock without hitting a burrito joint or a yuppie-calibre independent coffeeshop.
Go, London!