DAVID Wagner urged his Norwich City side to find a more ruthless edge after they were held to a frustrating goalless draw by Preston. The Canaries were on the front foot for long periods, but could find no way through a determined rearguard. “The feeling in a dressing room right now is one of frustration because I don’t think anyone watching that game would have had any complaints if we had won it,” said Wagner. “Defensively we were very good, keeping them away from our goal, but going forward we lacked a bit of creativity. “Even when you domina...