Willie Collum has been thrown into the Scottish Cup limelight as Scott Brown plays the referee card following Rangers’ victory over Ayr United. The Gers ran out comfortable 2-0 winners over the Honest Men at Ibrox in the end, goals from Borna Barisic and Fabio Silva enough to ensure victory. But rather than graciously admit defeat come the final whistle, Scott Brown couldn’t resist ramping up the referee pressure on a day when Willie Collum flashed him a yellow card. The controversial whistler was returning to a Rangers game after the Ibrox side slaughtered the referee’s performance in the Old…