Dylan Hartley could face England axe after being sent off against Leicester

• Stuart Lancaster has issued warnings over acts of indiscipline• Burrell: ‘We felt red card was an unfortunate call by the referee’• Match report: Northampton 23-19 LeicesterDylan Hartley’s red mist could not obscure the significance of this result. Until Northampton defeated Leicester in last May’s Premiership semi-final they had tended to find ways of losing to their east Midlands rivals but, even with a man down for more than an hour, they were too strong, resourceful and slick.Hartley, not for the first or second time, will command the attention for a loss of control in the 17th minute, h…