The parking fees are currently suspended for a while and the notice boards are all empty, refurb of toilets underway but there are temp toilets, large car park about 1/2 full today, probably chockers at the weeekend's so we will probably be ok if the meet starts at the usual 1000 hrs. Cafe is open for the usual array of butty's, snacks, brews and more important there is a whippy ice cream machine. It is National Trust and there are currently no notices to say that you can/can't overnight, it is open as a car park 24 hours, the facilities are not.
However, it is known as a hotspot for dogging afterdark, so that may deter casual campers
Edit: Afterthough, I am not speaking about personal experience, just quoting the most popular dogging sites in Surrey guide, totally shocked to also find that there is one half mile away from us