Builth Wells 12

The serene waters of Llangorse Lake in the Brecon Beacons hold a tale of darkest revenge, as presenter David Harper learns on a visit to mid-Wales. In the middle of the lake is a small man-made island called a crannog, which was once the scene of a bitter feud between English and Welsh nobility.

Elsewhere in Powys, a less hostile battle takes place between two teams of bargain hunters at Builth Wells antiques fair. In red are teachers Alison and Jemima, who reckon they’re going to win without a shadow of a doubt, and in blue are hairdresser Catherine and son Lewis.

With Kate Bliss by their side, the blues immediately focus on a pair of French opera glasses with mother-of-pearl veneers, but sadly they’re too pricey. Over with Thomas Forrester and the reds, it’s 'hello cello' when they see a wine bottle stand designed as a stringed instrument. Then the teams and their experts head to Newtown to see whether auctioneer Ben Lloyd and the bidders can string together some profits for them.