Matt Baker joins the foragers scouring the coast of Cornwall for free food. But he's going to have to take to the waves if he wants spider crab, and that means freediving - something he's never done before. Anita Rani makes an explosive entrance in her first Countryfile as she blasts 26,000 tonnes of rock in the world's biggest china clay quarry. Helen Skelton tells the story of the gardeners from Heligan who went to France to fight in World War I. And she steps back in time with the modern-day gardeners turning the clock back a hundred years in honour of their early forebears. Adam is like a big kid with a new toy when he takes the keys of a massive new combine harvester. And Tom investigates whether deputy prime minister Nick Clegg's plans to bring back garden cities could have a detrimental impact on our countryside.