Has anybody found a supplier for the full length reflective strip that is fitted to the rear bumper on the vrs model 

I think it used to be listed at http://www.superskoda.com/fr/Skoda/KODIAQ/Kodiaq-rear-bumper-center-panel-with-integrated-reflector-KI-R but it seems like it’s no longer there. Perhaps you can send them an email asking if they’ll ever get it back in stock