I haven’t a clue as to why there’s less cars now than in the past but I can back up WMC theory that WLTP may or may not of culled some cars as my current car, KIA Carens, was discontinued because they did not sale enough of the model to gain the WLTP ticket and make it viable to manufacture and AFAIK KIA does not have a car to substitute at or below the Motability AP pricing ceiling.
Only one example I know of because I have that car, one of the last to be registered in Europe, but is there others, I don’t know.