Buoyant England are not yet ready to win World Cup, warns Eddie Jones

Coach tells his players there will still be plenty of work ahead even if they beat New Zealand’s world record with a victory over Ireland and another grand slamEddie Jones has told his England players they are not yet good enough to win the World Cup despite standing on the verge of back-to-back Six Nations grand slams and eclipsing New Zealand’s world record of 18 consecutive victories.On Saturday in Dublin England will set off in pursuit of a 19th straight win buoyed by the return of Billy Vunipola and Anthony Watson to the starting lineup and, perhaps more significant, the absence of Irelan…