One thing I have always wondered about is where VW group cars which have had aftermarket performance engine maps loaded will sit in all this.
If VW are forced to put out a new map, is it compulsory to have your car flashed with the "fixed" map? If so, would those ECUs then be put into a read-only mode (therefore locking the "proper" map onto the ECU for life), or is it merely a trivial task to take your car to VW for the upgrade so you get a tick-in-the-box on their system and get a nice, official certificate (i.e. so your car is compliant with the type and therefore subject to the correct VED), and then stop off on the way home to have a performance map put back on again?
If the former then that's a big nail in the coffin for car tuning specialists; if the latter then it would appear that this is a completely pointless exercise.