Jules Hudson is in the Lake District to discover how recycled nappies and other soft plastics could be the answer to fixing the growing number of potholes in the crumbling road network. It is reckoned it would take £12 billion to get the roads into shape, but cheap and durable plastics could come to the rescue of cash-strapped councils. Steve Brown learns how the pollinating ability of his favourite creature, the bumblebee, is at risk from a certain type of pesticide. In Bristol's Botanic Garden, Steve meets bee expert Mario Vallejo-Marin from the University of Stirling to discover more. Margherita Taylor is in Croyde in Devon to discover how important tourism is to the village. But what is the best way to protect the very beauty tourists come for in the first place? James Wong is in Liverpool to learn about a rooftop revolution where the ancient growing method of aquaponics could help to feed a burgeoning urban population.