the Police are paranoid about speeding yet it seems going the wrong way against obvious signs saying no entry is ok?
I'm guessing - for the reasons Yorkie suggested - this is a grey area, legally. For example, the no entry signs on various entrances around the Mostyn Champneys car park almost certainly have no power in Law, although if you ignored one and then had a bump it would probably work against you in insurance terms. As the Marine Drive is a private road, it possibly has little more status in law than a private car park, although the definition of what constitutes a
public road is also not totally clear. All in all, then, it's probably wise to drive very slowly around some of the trickier bends on the Marine Drive, unless you fancy becoming a test case :-))