I always remembered the histories of Keep Calm and Carry On saying that it was never actually issued and displayed in public, so I was surprised to see this picture (above) in Cecil Beaton's Air of Glory.
I checked and though some histories still say that, the wikipedia entry says "the poster was hardly ever publicly displayed" (my italics)
I wonder if the fact that it turns up in a Cecil Beaton photo suggests it was more widely distributed than previously believed, or that this photo was staged with the assistance of the relevant Ministry. Or, indeed, if it suggests nothing.