This one has been around for ages. It was "floated" by the French; then EADS pointed out that it would kill most of their TBM market and the French govt, which always does what big French industry wants, shelved it.
It would also kill off the fractional bizjet operations.
It's not illegal; the USA forces non-N-reg planes to go N-reg within 6 months, I believe.
The UK may well implement something which does a lot of damage but I doubt many other EU states would.
It would also be easy to circumvent; the fractional operations would merely need to rotate their fleet via a non-EU location - easy with a bizjet whose range is more than adequate. Even Jersey would do just fine
