Worst Road in London

So where are the best roads? Where are the best downhill-smooth-wind-behind you places? I can only think of north from Highbury Park where it becomes Blackstock Road. Good Hill. Plenty of visibility so you're not so worried about death at 40 mph.

I used to get so envious watching US skate videos where they could actually skate on the roads, they were smooth as fuck, now I want to bomb down one of those San Francisco hills on a freewheel, if you picked the right one I'm sure you could get to 50 mph at least