Gareth Southgate has praised Kyle Walker for maturing into a standard-bearer in England’s growing group of leaders.There is an expectation around the Three Lions as preparations continue for Qatar having reached the World Cup semi-finals four years ago and then last summer’s European Championship final.England will be led into the World Cup by captain Harry Kane, who is supported by a number of club captains and trusted lieutenants within the squad.Southgate likes the leadership make-up of the group and highlighted the way 67-cap Manchester City right-back Walker has developed.“You notice players maturing,” he said. “For example, Kyle Walker who isn’t...