I am a total admirer(beyond idolatry) of Edith Piaf. I do not find the ad in the least offensive. I'm also at a total loss as to how anyone else could find it offensive. It seems to me a total tribute to her. It contrasts(as McGrath has pointed out much better than I could)the largeness of her singing about regrets with the smallness of the Specsaver regrets....a standard humorous use the good old figure of speech known as bathos.