Matt Baker and Julia Bradbury head for Jersey to lend a hand with potato planting and to find out how the island's infamous war tunnels are being given a new lease of life. Jules Hudson takes to the skies with the scientists conducting an aerial survey of Scotland's grey seal population, and there are new arrivals on the farm as Adam Henson's sows give birth. Tom Heap finds out about controversial plans to dispose of the waste from ten new nuclear power stations underground.