Last Monday we went through circa 5am and only Security B was open so down there Fast Track gets you half way along the queue and then everyone merges and snakes the rest of the way to the trays together.
Having just gone through the barrier the person manning the queue handing out plastic bags came running after us (and another gentleman in front) and I assumed we were either about to be challenged as to whether we should have been there or be turfed out but no, she actually opened up the Tensa barriers and marshalled us to the VERY front of the queue, she then also got her colleague who was co-ordinating people into position by the trays to ensure we were next.
All in all we were through a pretty busy hall in less than 5 minutes. I can only assume she was new and hasn't yet had the life sucked out of her by MAG.