With the aid of experts from the British Museum, Dan Walker, Michaela Strachan and Raksha Dave unearth the hidden history of the nation with the help of an army of metal detectorists, who use their kit and skills to scour an authorised patch of land for artefacts and items lost by people through the centuries. In the first edition they set up camp in Northallerton, North Yorkshire, searching in the shadow of a ruined castle and between Roman and Viking settlements