"I am the person everyone argues with but everyone needs. I make decisions in seconds that millions debate for years. I am unpaid at grassroots level and abused at professional level. What am I?"

Answer: A Referee. Referees enforce the rules of sport. Their split-second decisions are scrutinised endlessly by fans and media. At youth and amateur level they are volunteers. At professional level they are highly trained yet still regularly subjected to abuse from players and crowds.