The featured ingredients in this edition are barley, a grain grown in the UK since before the Romans arrived, and shiitake mushrooms, an exotic newcomer to the British larder. In Berwickshire, Roy sends off his barley crops to be used to make crackers, cereal and nutritional drinks, as well as feed a hungry lifeboat crew, while Lancashire farmer John's shitake business is booming as his mushrooms are shipped all over the nation.