Eddie Jones sees a bright future with Sherylle Calder in England camp

• Jones: ‘She will work with all the backs, but especially the back field guys’• Hartley not named England captain when squad was announcedEddie Jones believes the crackdown on high tackling will stimulate attacking rugby, one reason why he has hired the vision specialist Dr Sherylle Calder through to the 2019 World Cup.Calder, who worked with England’s 2003 World Cup-winners, will be involved in the squad’s training camp in Portugal this coming week. Jones has asked her to pay special attention to the back five players in the 34, the full-back Mike Brown and the wings Jack Nowell, Marland Yar…