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.