Antiques Roadshow: Bala

Michael Aspel presents the show in which members of the public are invited to bring along their antiques for examination. He and the experts travel to Lake Bala, in north Wales, where they see a pair of books inscribed to a local by Queen Victoria, an unusual collection of tie pins and a portrait by Charles Spencelayh. David Battie explains why a single item can have four different valuations, all of them still correct