John Mitchell will make difference for England, says Johan Ackermann

• Gloucester director worked with New Zealander in South Africa• ‘He is passionate about the game and big on discipline’Johan Ackermann has backed the appointment of John Mitchell as England’s defence coach and believes the New Zealander will get the best out of every player in the squad.Gloucester’s director of rugby worked with Mitchell with the Lions in South Africa earlier this decade before taking over from him as head coach in 2013. “I was one of John’s visa referees and he has already been on the phone talking about having a catch-up,” Ackermann said. “He will add a lot to England. He h…