As was the reaction of people she said good morning to, as she got onto the carriage. And her reaction at being grumpily ignored.
There's something not quite ringing true about this Register article, I mean if you get on a tube to move around central London in the daytime, chances are that the majority of folk riding will not be Londoners, but will be tourists or new residents from around the world. Often in groups and they do talking in their little groups whilst moving around and bumping everyone with their enormous backpacks.
How do they catch on the the tube etiquette of pretending nobody else exists so quickly? Do they take lessons?
The lady saying good morning has a strong chance of addressing an affable Kiwi or a friendly Swede and should get a response.