Ellie Harrison and Anita Rani are at Poole Harbour for the conclusion of a three-year environmental study, and thety celebrate Ellie’s last Countryfile episode with a trip down memory lane. Ellie visits artificial rock pools and learns the results of a trial which uses 3D printed reef blocks on the sea floor, hoping to make sea defences more habitable for marine wildlife. Ellie also harvests an unusual cooking ingredient - sea spaghetti. Anita joins a crew fishing for Manila clams on one of the final catches of the season, and she explores bird haven RSPB Arne to see the work done to protect the land for nesting birds such as oystercatchers. Anita also tries paddleboarding for the first time, meeting a local water sports group to find out how structures like piers help to reduce the impact of water sports and walkers on the bird population. Adam Henson is busy on the farm checking in on his Cotswold ewes and seeing how the recent back-to-back storms have affected his wheat crop.