We used to (and still do) get this at my parents house, as its next door to a junior school.
Usually its confined to 9am and 3pm, but on occasion people seems to park there all day, even though there is plently of room elsewhere on the road.
One time in particular, I needed to go out, and a car was right accross the back gate, blocking the driveway.
My mum went to the shcool, but they didnt know who it was, so I called the local police station and asked what my rights were. They dsaid I couldnt do anything really, but theyd send an officer over to assist.
Sure enough, an officer appears 10 minutes later, and my Dad asks him whats the legality of jacking the car up and wheeling out of the way.
The officer said if its an emegency and you need to get out, as long as you dont damage the vehicle, its fine.
So we got two trolley jacks, one at the front and one at the back and wheeled it a few yards down the road, when the officer suggests going a bit futher.

We oblige, and push it over to the other side of the road about 30 yards away.
Just as we are walking back to the gates, a man appears looking somewhat confused and agitated.
The officer asks whats wrong and he says his car has moved down the road, whats it doing there?
With that, the officer writes him a ticket for parking too far away from the curb ( he was a good meter away outside our gates) and advises him to be more careful where he parks in the future!
Several occasions I'd been blocked from getting into the drive, so I'd just park my car as tightly adjacent to theirs as I could to block the drivers door and then go inside and wait for the ineveitable knock at the door.
It amazing how people think its their right to be allowed access to their car door, but cant see the same logic when I explain I want the same access to the driveway. :bonk: