Tom Heap explores Northamptonshire's Nene Valley, discovering how a farmer fighting flooding has embraced wetland wildlife to make his land pay. Tom also meets a sheepdog turned search-and-rescue hero and gets hands-on with a project that has unearthed evidence of riverside residents dating back to Neolithic times. Adam is hoping for good news from his ewes as, thanks to scanning, he discovers how many are in lamb. Charlotte Smith investigates whether Brexit is delivering all it promised for the UK's fishing industry, and ecologist Josh Styles reveals the secret world inside a prehistoric plant.

Charlotte Smith visits the Colne Valley Regional Park, a landscape of forest, fields and waterways on the edge of west London. She does battle with an invasive species, gets up close with tiny creatures that show the health of the park's rivers, meets a savvy septuagenarian saving her farm from development, and helps secure a future for one of our most endangered mammals, the water vole. Tom Heap asks whether eco-education should be at the heart of our school system, Adam Henson introduces new boar George II to his sows, and wildlife cameraman Jack Perks gets up close with otters.