Not bothered

Not bothered, I approached the BA ticket desk explained in a loud voice how I had been given the wrong instructions and blah blah, missed , queue blah…
BA being BA this was not problematic, new tickets we issued without establishment of blame/consultations/rebuffals/attempts to make you buy more tickets etc.
All very civilized ´n that. Like Yorkshire Tea, Tea the way it used to be but for flights.

Staffers

Not having slept much, I was handled by the airport staff rather than the other way round.
Consulting staffer, I was directed to queue and stood with rucksack, along with other business types.
Stood for a while. 45 minutes or so @ bag drop and desk established that plane had left without me as well as this i had been standing directed to stand in the wrong queue.
This being true, I wasn´t too bothered.
There´s no law against doing what you are told, although I think they´re trying to bring that one in gradually.