Sorry Martyn!
London is a good city to cycle ... Though I am only just over 2 miles from work so I walk in and get the bus home (not so mustachian yet then)! But at least no car - we have a car club car and van right over the road, but we hardly ever need to use those even... :-). There are a few hills, but not in the centre (and even further out it's not exactly San Francisco ... I think the only city I HAVE cycled in).
The cycle hire scheme is expanding closer and closer to where I live though, so who knows, maybe I will give it a go!