Did it, and besides realising halfway up the A34 with a liberal coating of salt on my windscreen that my drivers side washer jet was frozen, it was a nice trip. Very pretty and not too far at all from Llandovery were we did the birthday bash last year. Bit different doing it in a luxry saloon to doing it in the Zook :)
Averaged 27.8 MPG too, bonus for that car :)