In the second Castle in the Country location, John Craven and Gloria Hunniford explore the treasures in and around Berkeley Castle in the beautiful Cotswold countryside of Gloucestershire. Gloria learns the story of physician Edward Jenner, who is widely credited as the pioneer of smallpox vaccine, while John explores the architectural history of the castle. Chef Matt Tebbutt discovers an enormous mushroom perfect for the pot, and Christine Bleakley reveals the importance of Gloucester Docks.