This week the team are in Hampshire celebrating our chalk streams. Anita is with the volunteers of the local Wildlife Trust who use novel ways to check for water pollution. She also joins a group of women with breast cancer who’ve found companionship and support through fly fishing. Matt meets the farmers who are trying different approaches to help reduce run-off from their farms, including one whose water buffalo were causing a bit of a problem. Joe Crowley investigates claim that factories are flushing polluting chemicals into watercourses, and he also meets Cyril Bennet, one of the world’s leading experts on mayflies, to learn about his work reintroducing them to rivers. Also in this programme, Adam and Charlotte meet the last of the three contenders for our Farming Hero Award.