if it states members only then no,but some sites do allow non-members and charge xtra,also you can join when you arrive,best to call them 1st and not just turn up.
If you check on the UKCS listing for a particular site, you should find if it's members only (as here) - if it's open to non-members this should be mentioned on the site's own website.
Don't forget to leave a review of the campsites you have visited this year or last!
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets