David Dimbleby takes a trip around Britain to see how the countryside has inspired art's greatest paintings. He visits East Anglia - Constable country, a land of mists, meadows, windmills and fenland; goes to Newmarket, home of George Stubbs; takes to a balloon to view the Flatlands; sails the Norfolk Broads in 19th century style and confronts the murder scene of Dorothy Sayers' The Nine Tailors.