John Craven and Nicki Chapman continue to delve into the treasures at Burghley House in Lincolnshire. Lady Victoria Leatham takes John to see the new Elizabethan garden planned for Burghley. Antiques Roadshow's Lars Tharp shows Nicki some fascinating Chinese ceramics that are very personal to the house, and chef James Martin digs up some Jerusalem artichokes for another delicious recipe.