"Look at adverts for things like washing powder that show children getting very dirty. Any time a business wants to sell something to parents they always try to do it by using images of children outdoors," says Michael Pettavel, head of Randolph Beresford Early Years Centre in White City, London. In practice however, getting children playing outdoors can be a minefield of rules, regulations, policy, guidelines and, most of all, fear. "We're worried about children's safety, we're...