Paul Martin presents from Powderham Castle in Devon. Dating back to the 14th century, it is the long-standing home of the Courtenay family. Antiques experts Claire Rawle and Mark Stacey find great treasures among hundreds of visitors to the stately home. Claire meets a steam train fan with a great collection of memorabilia, and Mark gets a surprise when an art deco Spanish bracelet goes under the hammer. And Paul Martin delves into the history of the Met Office.