I think its the customers that should be told not the dealer?
At the end of last October I took delivery of a KIA Carens, 7 weeks after the cut off date for non compliance WLTP cars on Motability and if I remember right they said (Motability) that ALL car taken delivery on or after the first of September 2018 HAS TO BE WLTP compliant.
After a few week of driving this car I got suspicious that the car is not WLTP compliant because it was not showing as such on the German site we were all using back last year.
So it turns out that manufactures are allowed to continue to sell cars that are not WLTP compliant until September the first 2019 as long as its a discontinued model and KIA took the decision to discontinue this model in October last year therefore enabling them to sell this model onto unsuspecting customers.
So if my local council were to decide to charge all no compliant WLTP diesel users to take their diesels into town who pays the charge.
TBH it would take the council a couple of years to implement such a scheme and the car would be gone by then but lucky for me, it’s not my car.
So no good telling the dealers as they want to get shot of the scrap metal ASAP.