A bit of a grey area. In dulwich,london, a car with a bloody great camera strapped to the roof comes round and videos all vehicles that are parked. any parked on the white line where a dropped kerb to a property is, will get a parking ticket. so, when you have friends round, they can't park outside your house in front of your drive as they might get a ticket. I am reliably informed from a ticket recipient that they also come round late at night with the video car.( wouldn't see sod all here. like the black hole of calcutta after dark)
problem is in this road in dulwich, now every one has a dropped kerb, there is no where for anyone to park except disabled vehicles, so when you visit you may have to park streets away. glad i live in the countryside, dark it may be, but parking not an issue.