How cool is that living that close to a Chinese
I'd contact a private clamping company. They'd earn a fortune on a Friday/Saturday night. Also and I may be wrong but I'm sure its not an offence to obstruct a gate with a dropped kerb. Its a pain in the arse as you well know as I've had it happen to me a couple of times, although they've moved it pretty quick when, I've hooked a towing eye chain to the front or rear of their car.
Even if you put up signs or the Council put in double yellows, you'll still get some numb nut parking there. Butter under the door handle is messy. It might be worth trying your local paper as they might want to have a dig at either the Council or the Chinese for whatever reason.