By Andrew Harding, Reporting from France, Belgium, Luxembourg and the UK As he ambled, nonchalantly, across a sunlit public square, the smuggler appeared to have no idea he was being followed. He was a short, stocky, 39-year-old in a pale green shell suit and baseball cap - an unremarkable figure taking an afternoon stroll from a tented migrant reception centre to a nearby tram station. Our team b