Howard Webb was a guest on Monday Night Football and the referee discussed some general issues in football along with Gary Neville and Jamie Carragher.
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Prompted by Jack Wilshere's head-to-head with Marouane Fellaini at the weekend, the three talked about the definition of a headbutt with Neville suggesting that referees nearly require a "butt-o-meter".
The three also discussed diving. Neville suggested to Webb that if refs punished fouls in the box where a player did not go to ground then perhaps the numbers of incidents of simulation would decrease.
Webb also talked about his approach to issuing yellow cards in big games.
