Can't help a lot with that site as we changed to go to Wyatts Covert but there is a lot easier access from Crystal Palace
and although the Campsite at Wyatts Covert is nice
the kids would be absolutely stiff with boredom as it's in the middle of nowhere

wonderful for relaxing and watching wildlife

BTW to get into London we had a Travelcard which gave us train AND underground travel all day you may get something similar from Crystal Palace

Just realised thee is a report on this campsite on Davids site

http://www.davidklyne.plus.com/crystal_palace_caravan_club_site.htm

Regards
From
Gray
The Madcaravanner from Chesterfield
http://www.madcaravanner.co.uk
You don't have to be mad but it helps

Pictures at http://community.webshots.com/user/madcaravanner
http://www.flickr.com/photos/madcaravanner/