In reply to TechnoJim:
You are correct about there being a no overnight parking sign but it was mysteriously removed earlier this year.
There is no proof but there was suspicion it was done by someone in a caravan, motor home or camper van as the sign was specifically against overnight parking for caravans and camper vans.
Its replacement is being looked at the local community council.
I don't know but I think the community is not against someone leaving their car empty overnight, eg while they did a couple of days in the hills, but they did not want the car park being treated as a campsite for caravans and campervans.
However, give the behaviour of some visitors the local view might have hardened, but malky_c's and zb1's experiences suggest you aren't going to have a problem.
Dave