John, Anita and Ellie are in Lincolnshire, where it's all go in the vast fields of winter veg. John visits a farm where they are harvesting tonnes of caulis and sprouts in readiness for Christmas, and he visits the trial plots where new types of vegetable are being developed, including the kalette, a cross between kale and a brussels sprout. Anita sees how robot technology designed to pull up weeds could cut down on herbicides and even cut down on human labour. Ellie visits the ancient woodland at the edge of an old RAF base where bats have set up home in old wartime buildings, and she discovers that it's not just bats hibernating there - butterflies do it too. Adam talks about his lifelong passion for ducks - one of his favourite farmyard animals. Tom Heap finds out why many of our rivers and waterways are suffering and what farmers can do to help bring them back to life.