Antiques Roadshow expert Raj Bisram was left stunned when one guest revealed her connection to the music icon Rod Stewart. During a new episode of the BBC series, Fiona Bruce and the experts visited the Scottish Borders where a silver chalice was thought to have been found in a potato field. A gold, enamelled snuffbox gifted by a Russian tsar was found also caught the attention of some of the experts. Katherine Wright and Charlotte Riordan discovered two artworks featuring Thirlestane Castle itself – a 19th-century embroidered sampler and a rare watercolour by Borders artist Tom Scott. Adam Sc…