That and coping with the smaller roads, gas prices, insane traffic levels etc etc.

I won't comment on the price of petrol (diesel in my case), but I will say this:

Driving in London really gives one an appreciation of exactly how wide one's car is.

You know how it is -- you're making your way along a narrow street, cars parked both sides, there's solid traffic in both directions, a bus half pulled into a bus stop, and then, suddenly, there's flashing lights and sirens from behind you, and an ambulance comes screaming up the road, using a gap that's just not there. It was like Moses parting the waters, I tell you.