3/9. Re-wilding. It is now becoming recognised that large, landscape-scale nature reserves need to be created if biodiversity and a full range of habitats in the UK are to be maintained. Paul Evans visits two projects, the RSPB's Lakenheath Fen in East Anglia and the Wild Ennerdale project in Cumbria, to explore how large-scale conservation could shape the future countryside. Producer Brett westwood