A combination of things.
Firstly I asked the dealer when I ordered my iv80 coupe as the brochure pictures show cars with no rear wiper.
That was after I visited 2 dealers looking at newly arrived demo models which all had no rear wiper. Both my local dealer only received coupe demo models recently.
Then lastly I viewed all the iv80 coupe on Autotrader. Only ones with either the clever or plus pack have rear wiper.