By Olivia Wheeler Antiques Roadshow expert Gordon Foster admitted he was ‘gobsmacked’ on Sunday’s show as he valued one guest’s ‘Scottish treasure’ with an incredible history at £150,000. During the latest episode, which was filmed in Pollok Country Park, Glasgow, a guest wanted a family-inherited silver basin, jug and glass bottle of water valued. However, the items soon took a new incredible turn when he shared the family history behind them. The guest revealed that it all started from an ancestor, who lived in the 1400s on the outskirts of Edinburgh near a place called Cramond Brig. They ex…