There are two clubs in your area.
MK 4x4 and Aylesbury LR Fanatics.
I certainly know that all the Aylesbury events are centered around non damaging (as non-damaging can be, you could after all damage it on a kerb!!) courses. Most of the members use their trucks on a day to day basis so we dont take many risks.
The other adavanage of a club is you get alot of free on hand knowledge.
Worth thining about, both clubs are listed in the Land Rover mags club listings if your interested mate