If you can find a phone number, give them a call - there's nothing to loose.
In some idle moments recently, I've been calling some obscure fields, microlight fields, gliding clubs etc, mainly out of interest. (Not been to any of them yet, but might well do over the summer.)
Just about every call has been met with a friendly reply, varying from "Yes, of course you're welcome, we can provide you with a hangar, a bed for the night, free champagne+caviar and someone to clean your boots", through to "You'd be welcome, but you should probably drive in first and take a look, the field might be too rough for you", or, in the worst case, "we'd love to let you fly here, but our planning permission only allows one powered aircraft to operate here at any one time, and that's the gliding club's tow-plane."
Have to admit I haven't called either Chalgrove or Lewknor yet (possibly because of a bad mis-identification experience when I was a student...)
FFF
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(PS No one has actually offered me free champagne and caviar yet.)