In the eye of the storm: the referees' perspective

Who would want to swap places with referee Howard Webb in Sunday's potential Premier League title-decider between Manchester United and Chelsea?

After the championship race was blown open amid a spate of officiating errors in last weekend's games involving the title contenders, Webb faces an unenviable task at Old Trafford, with players, managers, fans and pundits ready to pounce on any perceived mistake.
The last Premier League meeting between the two sides led to United manager Sir Alex Ferguson incurring a five-match touchline ban for his criticism of referee Martin Atkinson's performance in Chelsea's 2-1 victory.
And Ferguson has already ramped up the pressure on Webb by claiming Chelsea benefited from "great decisions" in their 2-1 victory over Tottenham at Stamford Bridge on Saturday.
So how do referees prepare for such monumental encounters? How do they keep their heads while all around them are losing theirs? And how do they deal with the inevitable criticism which follows?
We asked former Premier League referees Alan Wiley, Jeff Winter and David Elleray, who took charge of many crunch matches during their long careers in the top flight, to provide a window on to the world of an official on the day of a big game, and assess the challenges facing Webb and his assistants on Sunday.