I don’t see the likes of BMW or Mercedes coming back on the scheme, but of they did, I’d imagine the AP’s being astronomical. Audi charging 4k for an underpowered A3 is probably be an indication of what the premium brands intentions would be if they were to ever return.
My last 2 cars on the scheme have been:
Mercedes CLA 200 AMG line Night edition. AP £2700
Mini Cooper S JCW sport 2. AP £750
The equivalent Mini is now £4k and you’d be lucky to get a decent spec’d Vauxhall or Ford now for what I got the Merc for.