Is it a good idea for big areas of Britain to be returned to nature? The idea of re-wilding is spreading fast - that allowing some land to go back to its wild state is good for the environment, and works economically, too, in a country that has lost so much of its biodiversity and woodland. The case seems to be gaining support in government. But what about the need for food-production and housing? And do we really want to return to some kind of primeval Britain with wolves and lynxes roaming huge forests? Alastair Driver is director of ReWilding Britain, former Head of Conservation for the Environment Agency - he leads Phil and Roger through the case for letting and helping nature rebuild our countryside.

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