hmg
Victory lap
also, i think its probably worse to cycle slowly in london than not. i think that if you are more or less at traffic pace your chances of survival are better. its not every red light you can jump, some are safer than others, and some people are so slow getting out of the traffic lights, more bikes build up behind them - absolute recipe for disaster. keep it quick, focussed, no distractions.
This is the big advantage in london of having electric power, it amplifies your effort as you pull away from a standstill, into the open road. Steady pedalling will propel you up to 20mph easily and you can keep that up for miles and miles, at a pace that matches and exceeds the flow of city centre motor vehicles. Motor assist cancels out your mass, it's weightless cycling, which is at least as welcome as power steering and cruise control in a car.