Countryfile visits Warwickshire, where Matt Baker explores Charlecote Park and the River Avon which runs through its grounds. He discovers the plants and wildlife that thrive here and the watermill which harnesses the power of the river. Anita Rani is up to her knees in mud to discover what it is really like to be a pig farmer, and she also gets behind the wheel of a heritage Land Rover to discover its history as a workhorse of the countryside. Helen Skelton explores Middleton Hall and the much-overlooked naturalist John Ray. Adam Henson gets stuck in with the asparagus harvest. Green waste is often used to fertilise farmers' fields but, as Tom Heap finds out, it is not always as green as it's cracked up to be.