Antiques Roadshow

`Antiques Roadshow' returns to Ham House in Richmond, where jewellery specialist John Benjamin is amazed to see a necklace and bracelet found in a bag of compost bought at a garden centre in Germany. Mark Hill is intrigued by a chessboard artwork designed by film-maker Derek Jarman, decorated with pebbles and salvaged objects, while Hilary Kay reveals the secrets of a carved walnut shell that contains a miniature globe.