I live near Carmarthen and have and have been laning a couple of times but would would like an opportunity to do more.
Re:clubs. Internet searching I've only found one in Pembs.- West Wales 4X4 who appear to do more trialing than laning (Please correct me if I'm wrong). West Wales 4x4 Group
In Pembs. and Carms. there are GLASS reps who you could contact.
Also, South Wales Laning which is organised by the GLASS reps from Neath and Caerphilly www.facebook.com/groups/717076675054061/
Then there's Red Valley pay and play site near Carmarthen https://www.facebook.com/redvalleymotorsport
but it tends to open for groups like Bonkas 4x4 www.bonkas4x4wales.com - home page
I would be interested to hear of any other groups in the area.