Get picked up when you’re drunk.

ScooterMan

How's this for value-added service?
Drive your car to the pub, get drunk, call scooterman. Someone will show up on a foldable scooter, and (fully insured) drive you and your car back home.

Now I don't drive, and folding up a scooter and putting it on the back of a bicycle is probable not a good solution, but if I did drive. And lived in London. And ever got drunk (ooops). I'd use this service. Or maybe not, but I'd tell my friends about it anyway.