It's off Junction 7 of the M20 in Kent. Parking is free but it's £8 per person to get in.
There are more details at http://www.kitcar-shows.co.uk/ under the Detling link and they have loads of links to companies/clubs that will be there. No matter what your taste in cars you're bound to see something that you'd kill for to own and something you wouldn't be seen dead in
If anybody from the club wants to meet up there (or before) then let me know, cheers
Jason