Anthony,
Whichever club you join, they will have LOCAL groups. C&CC have District Associations, one of which is for South Wales and surrounding areas. The CC have Centres which do the same thing.
The C&CC have Interest Sections, i.e. Moutain Activity Section, Folk Dance & Song Group, Canoeing section, Boating section, Lightweight campers, and as mentioned above the British Caravaners Club, Trailer Tent Group, Motor Caravan Group and the one I have just joined, the Photographic Group. Apart from the Photographic Group, the majority of the above will have local sections.
For example the FD&S Group have the South West Section which covers your area.
Happy camping!
Margaret W