Natasha Raskin Sharp investigates a mysterious shell grotto. Caroline Hawley and Raj Bisram lead the teams at Detling Antiques Fair in the hope of finding a rare gem.

The reds and blues are searching for bargains at Wetherby Racecourse in West Yorkshire with the help of experts Charles Hanson and David Harper. Meanwhile, Charlie Ross learns the history of an unusual chapel in Knaresborough that is hundreds of years old and carved into rock.