Ok, it aint the easiest place to find. In fact, I may contact them and see if they could put a few markers on the roundabouts to direct people in.
But here is the location on google maps.
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LoginBasically get off on Junc 26 M4 and follow the main road until you see a fairly modern road bridge going over the river on your left hand side. Take that bridge and go straight through the first roundabout, and right at the second one. Next roundabout, take another right, and the 1st right on that road into the industrial estate, and South Wales Superbikes is on the right about 100 yards.