I have also started noticing them on a near daily basis.
Had my first polite knock on the car's window today from a guy who was interested in my feedback. I think he was retired, so unlikely to be interested in company car tax breaks.
I wonder if that perk will be removed if too many high mileage drivers buy them. It's there to encourage more fuel efficient cars, but for motorway mileage, they should probably be encouraged to stay with their diesel Beemers.