As if watching Celtic crown their third Scottish Premiership title in a row v Derek McInnes wasn’t bad enough for Rangers. The Ibrox club will have to make peace with the fact Willie Collum – against whom the Gers have been vocally disagreeable in the past – has just taken the top refereeing job in the country. It means that Rangers are going to be in regular dialogue with the SFA’s uninventive new Head of Refereeing and it’s enough to make you titter. If you don’t, you’ll probably cry. But as Rangers, and the rest of Scottish football, look to improve the woeful standard of officiating across…