I was in Wales this weekend and saw plenty of people giving it some stick round the roads. Not sure if they were 'having fun' or not but you have to be pretty careful round there now as it gets real busy. Lucky doesn't even cover it reading that.
Don't know exactly where they went over, but Machynlleth is part of (one of) my routes around Wales (the mid-Wales one) - this beauty spot seems to be on the B4518 between Llanidloes & Llanbrynmair. Won't comment on the accident as I wasn't there, but if they were on the B road then it's a fairly decent surface. If they went off onto one of the minor roads off that B-road then they do get very narrow and you'd be doing 10-20mph max.