Interesting. I was at Saunton Sands today. The Christie Estates, which I presume owns the beach above the high tide mark, has a sign up prohibiting land yachts, dune buggies etc and threatening a £2,000 fine and future bans on vehicular access to the beach for miscreants.
Of course, a land yacht does not fly and has to be conveyed across the upper beach to the intertidal zone, where it then races up and down. If it was dropped miraculously from the sky below the high tide mark, I guess there wouldn't be much they could do about it.
This might explain how the RAF manages to land Hercules on Saunton Sands.
Does the Crown, in practice, care if you land on one of its beaches? Can it prohibit it? We don't seek permission from the Crown every time we go for a stroll along a beach, after all.
Where's Flying Lawyer when you need him?
QDM