Greyhound
Well-known Exeweb poster
My car has both! It does spend a fair amount of time in its garage, so that's probably why you haven't spotted it.Paper tax discs in windscreens. There were a few defunct ones still hanging on in recent years, but I haven't spotted one in the wild for months now.
See also: National Trust membership stickers in windscreens. It must all be done online these days.