Villages by the Sea S05E04 - St Agnes

Ben Robinson investigates how a Cornish gem became world-famous for tin. In the bay, the archaeologist unravels the epic story behind the hundreds of huge carved stones that lie scattered in the surf. There's a look at some medieval technology in action at one of the oldest tin refineries in Britain, and a local doctor consults his ancestor's 150-year-old medical diary for evidence of past ailments.