hi Chris, there are occasionally days out organised to P&P sites - no reason why anyone cant pick up the mantle and organise one.
The club does run 2 or 3 "driving days" during the year which usually have some more challenging terrain available, and plenty of recovery on hand for anyone that gets too ambitious.
Or, as Jock suggests, why not get along to an RTV (Road Taxed Vehicle ) trial - that will test you and your motors ability in a fun environment.
Regards, Alan