It seems they stopped at some point because of the queues, but I don't know when it was, at some entrances they were even using scanners, they just patted us down (not very effectively I might add), and didn't seem to have hand scanners at M1/M2.
It begs a further question of "supporter services" though, why the difference in security at different entrances, if it requires higher security why is it not equal ?
I'm not trying to be difficult here, the issues today clearly need questions being asked, because it wasn't satisfactory.