Predictably, there’s the usual outcry from Rangers supporters that they were hard done by in a derby defeat against Celtic. The Bhoys emerged victorious in the Scottish Cup Final on Saturday by a 1-0 margin after Adam Idah slammed the ball home from Jack Butland’s parried shot in the 90th minute. Chances had been few and far between in the match up to that point with neither side really showing the quality in the final third to put the opposition under serious pressure. But it was Celtic who showed their winning mentality again in the derby this season, picking up their fourth victory against …