@suearcher "they switch to speaking Welsh when you go into a shop."

Back when I was more of a learner, I really wished they would. It's far more often the case that they switch the other way, i.e. into English, as an unfamiliar face enters. Then a possible chance to use Welsh "in the wild" disappears.

I really don't know how the people that spread this myth think it works. Some sort of Saesdar?