Want to get your career moving? How about working on a playbus? Patricia Slatcher  gets on board to see what the job involves They are big, bright and bundles of fun. Playbuses are one obvious answer to child provision problems, but there's not nearly enough of them. The National Playbus Association (NPA) has 250 voluntary sector mobile projects registered, but only 70 operate within the early years field. This doesn't account for those run by local authorities...