If you mean the actual castle car park, it's locked when the castle closes but if you mean the one on the Point, it probably is checked by the police. They are pretty hot on people sleeping in their vehicles unfortunately because a few horse box dwellers have parked their unsightly homes in places where "NO CAMPING OR OVERNIGHT SLEEPING PERMITTED" signs are clearly visible for several days (weeks!) at a time.
There's no guarantees, but you might get away with it at the very back of Swanpool Beach car park (I've been down there early in the morning and there's been vans with their silver screens up which I assume have been there all night). Likewise, Queen Mary Road which is the road between the car park where we are having our meet and the beach.
I'm sorry that I can't offer a space outside our house but we've got too many cars at the moment, and are already upsetting the neighbours. It's even beginning to upset me
