Everyone who has posted about trouble mentions alcohol, so there would have been less time to consume it.
Depends, we got to Wenbley Park around 1130 and still saw plenty of folks that had already consumed a fair amount of booze.
Probably a better plan would have been for those in charge of coaches to have done their job and stopped people getting pissed on the way to wembley. Our coach was past by dozens (we must have been driving slow) that had people drinking on them.