In reply to Nic:
Hi nic, I regularly drive this route when in the uk because I live close to pembroke, the scenic route is great it's a awesome drive with great views and all that carry on. The problem is that time goes slower through those villages so the farmers rarely pull over the old folk don't get out of second gear and the road is just generally slow. I would advise going on the m4 and enjoy the climbing and if you fancy that part of the world head up for a weekend of walking in the beacons when it's festival time. Good luck. Ben