Who owns the Club

With  a membership organisation its more a case of who is responsible  for it rather than who owns it.  The Executive Committee I guess have that responsibility.

I imagine (only a guess) that the club is a company limited by guarantee Most guarantee companies are not-for-profit companies - that is, they do not distribute their profits to their members but either retain them within the company or use them for some other purpose. 

The main reason. to be a company limited by guarantee is to protect the people running the company from personal liability for the company's debts, just as a business may be set up as a company limited by shares for the same reason.  

Again I'm guessing that if CC ltd went under the assets would be sold off to service any debt but not sure what would happen to any residue 

If you scroll down to the bottom of the page you'll find "about us" or click on further links to find the same subject. In this area are the articles of association which describe how CAMC operates this includes the finance operations and procedures. About us also includes the club history etc.

https://www.caravanclub.co.uk/about-us/articles-of-association/

we're silent partners

Oooh, you flatter us but you forgot to put the smileys after your joke😂

That’ll be the day 😀

Watch and learn, Freddy. 👍🏻