London has a really weird situation whereby there are 5-6 hire schemes running in the city, so 100s (1000s?) of scooters about. But using your own private one on the streets or cycle lanes is actually illegal. However the police don't even attempt to enforce it and loads of people have and use them daily. It's not just teens dealing drugs either - hang around Bank at 8:30am and you'll see hoardes of smartly dressed business people flying by on them. It's quick, easy, cheap, lots of fun, and you don't tend to get as sweaty (like you can on a bike).