Originally Posted by
Speedbird876
A bit after the boarding pass scan they have one of the normal belts set up for Fast Track as a bit of an overflow.
That's also quite common. If you see bunching just after the Fast Track gates on the right hand side, and perhaps some less competent travellers ahead of you, you should notice there is a passage gap behind the back of the agent's chair on the left side, this feeds into main security, and then as you say there may be some overflow Fast Track channels on the right of main security, show your boarding pass to get admission. Just ask the gate agent in Fast Track "Am I best to go left?".