For years, security at all BAA airports has been seriously understaffed (in order to maximise profits), and now in this current situation, the system cannot cope. This is despite the fact that everyone pays for the security checks. I personally would like to see BAA management taken out and shot, and half the shops removed from their airports.
It appears that BAA are rather more interested in maximizing profit from pax in shopping malls than from running airports as places for people to travel to and from.
My next trip across the Atlantic is now booked; I'm going by ship.