Llanelli began with a bang when Wyatt, who switched to the back row after Scott Quinnell withdrew injured, powered over from the home side's first attack.
The boot of Cipriani took the visitors back in front but shortly before the break, Tom Arscott's dynamic attack gave his side a promising field position, and Jason Strange landed a penalty to give the hosts the 15-13 half-time lead.
It was a deserved win for the French side whose superiority was built upon the sophisticated edge given to their attack by the half-back pairing of Bosc and Adam Mogg.