John Craven and Nicki Chapman uncover more riches at Burghley House in Lincolnshire. John explores the local market town of Stamford, antiques expert Lars Tharp takes Nicki to learn about Burghley's oriental ceramics, Julie Edmonstone gets a masterclass from top flower arranger George Smith, and James Martin cooks up a Lincolnshire favourite - sausage and mash - with a twist.