My first publisher was Victor Gollancz, and though my books were too late for the treatment, early Gollnacz crime and SF books were, of course, always published in a yellow cover.
I always recall as a young teenager (though the name was not used in my day) that I scoured the public library shelves for yellow spines as my primary means of book selection. I was later very proud to become a Victor Gollancz author, though rather disappointed my crime stories would not be 'wrapped' in yellow! There was some talk, I suppose in the late 90s, of reviving the yellow cover. I think some Gollancz books did come out with a yellow spine. But none of my titles.
Now, at last, i will be published in yellow. I will keep you up date concerning the progress of my Italian editions. If you want to read them in Italian, that is.