England captain Dylan Hartley is one thuggish act away from career oblivion | Robert Kitson

The hooker can have no complaint at his six-week ban given his poor disciplinary record and the fact that rugby is cracking down on tackles to the headRugby has always been a game of sliding doors. What if Dylan Hartley had started for Northampton in the Champions’ Cup game against Leinster last Friday night, rather than steaming in off the bench with a point to prove? Would he have administered a swinging arm to the head of Sean O’Brien in a Test-match arena, where his recent discip