Marcus Smith of Quins can be our X-factor rookie, says England’s Eddie Jones

• Teenage fly-half excelled in last week’s win over Wasps• ‘What I would like to find is someone like a Milner-Skudder’Eddie Jones has said the teenage fly-half Marcus Smith can be England’s “X-factor rookie” for the 2019 World Cup but warned the Harlequins No10 he will spend most of next week’s training camp “polishing boots”.The 18-year-old has made only two Premiership starts for Harlequins, including a man-of-the-match performance against Wasps last weekend, but he was on Friday named in Jones’ 33-man squad for the three-day training camp in Oxford. In total Smith has played 196 minutes of…