It's not a story focussing on a particular event, but my second-favourite place to set in GC T5 is the glass wall overlooking the terminal. It's quiet, near a coffee machine, and you can look down upon the CCR door to count the 'success rate' of people who walk up to it looking hopeful versus the 'magic wave' of the dragon in the direction of the escalators. About 1 in 10...
Including those who walk up, get turned away, then come back and argue a bit.
In fairness a lot of the time the people are likely just asking directions to the right lounge (perhaps not believing the walk they're being asked to make), but, sometimes, you can just....tell when someone is trying to get blag a) a shortcut or b) fine champagne, or c) "please re-check my BP" whilst leaning on the desk to have a moan.
Category c), by the way, is usually people who are the least considerate going through security, which is another great people-watching time-passer.