Merthyr is my club and they put on very good trials. I also regulary ride Dulais Valley, Neath, and Gwent Schoolboys. I haven't ridden any Pontypool trials yet but I am riding one of theirs this saturday so I will let you know. Like yourself, I returned to trials a year ago after a 15 year break and I have really enjoyed it. All the clubs are really friendly with lots of people willing to give you advice. All the clubs do an easy route to help get you back into it. welshtrials.com is a very good website too. Best of luck.