I think you can drive on Morecambe beach, again classed as a car park, but don't overstay.
Yes, I should edit my post to say those and privately-owned beaches are another matter. There's a couple in Sussex we've used for barbies in the summer, which is kinda funky, but I wouldn't do it in anything that didn't have 4wd.
I assume the chinook charter means they ditched the hovercrafts to Goodwin then? Where they run by Hoverspeed?
Yup, s'right. A few weeks after our event, Hoverspeed charters stopped. The costs were pretty mental - I have a vague recollection of the Hoverspeed bill alone being around £7k (and this is 10 years ago!). Don't think my brain even wants to remember what the insurance bill was. The Risk Assessment and 'elf and Safety rubbish for something like that today would be enough to drive you insane. As far as I know, no-one ever drove a 4x4 on Goodwin after us. Shame. Nerve-wracking as an organiser, but epic fun.
Edit: Oh yeah, random trivia: Hoverspeed referred to our journey on all docs as a 'flight!'