hi ollie,
always something to ride in your neck of the woods, lyn torridge and exmoor all run great trials there is also Moretonhampstead http://www.moretontrials.co.uk/, West Of England http://www.westofenglandmc.co.uk/ both worth a look and if you dont mind travelling a bit there is also amca clubs Launceston www.launcestonmcc.co.uk and Holsworthy www.holsworthymotorclub.co.uk also if you into classic trials theres South West Classic Trials and even more in cornwall if you're feeling really brave! haha prob missed a few clubs out somewhere too i expect