By jnurden@thekmgroup.co.uk (John Nurden) It has been a year since work began on revamping one of Kent’s busiest motorway junctions. But what happens on the other side of the barriers? Senior reporter John Nurden donned his hard hat and headed for the M2 and A249 Stockbury roundabout to find out. The first person you meet as you enter National Highways’ compound at Stockbury near Sittingbourne is Ahmed Ali. He is there every day, rain or shine, to welcome visitors to Graham’s construction site. And he does a marvellous job. “Good morning sir, my name is Ali,” he says, smiling and proudly point…