In part two of this Coffee Club special with Willie Collum the SFA referees' chief reveals what it's like to make high-profile mistakes.

He opens up to Robert Grieve and Bill Leckie on one major error he made in an Old Firm game.

And he reveals the wrong call he made on the European stage that set his career back at the highest level.

He also discusses his hopes of seeing more female refs at the top level in Scotland.

And he explains what it was like to ref superstars Messi and Ronaldo.

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