How much is a honey bee worth? Can you put a price tag on a mountain? Monty Don explores the value of nature. Some believe the only way to preserve nature is to show that it can pay its way in a world driven by money, others disagree saying nature is too precious to be left to the whim of markets. This week there is a report from St. Andrews in Scotland where Trai Anfield discusses the value of estuaries to both nature conversation and human activity, plus there is discussion in the studio with author Tony Juniper and Dr Bill Adams from the Department of Geography at the University of Cambridge.