Northampton defend handling of George North as concussion row is reignited

• Wing waiting on all-clear from concussion expert to return to playing• Premiership Rugby launches review into incident in Leicester matchThe Northampton and Wales wing George North will not play again until he has been cleared by a concussion expert after the club admitted its medical team were unaware that he seemed to have been knocked out during Saturday’s Premiership match against Leicester in allowing him to return to the field.North was tackled in the air by his opposite number, Adam Thompstone, landing on his side but appearing to hit his head on the ground and seeming to temporarily …