Plot: The Bargain Hunt teams travel to Builth Wells. With the help of experts David Barby and Chris Gower the reds choose with their heads while the blues go with their hearts - but which approach will get the best results? Tim Wonnacott visits the Potteries Museum and Art Gallery in Stoke-on-Trent for a close-up look at some items from the largest hoard of Anglo-Saxon gold ever to be discovered in Britain