I wonder exactly how the bill is written?

If it’s just “turbines” as Moggy says the UK law is written, it would effect far more than just the bizjet guys with top of the line Gulfstreams.
Remember, most US bizjets are far down the scale, not that they couldn’t afford more taxes, but it would effect a small firm with a Caition, one of the new VLJs, or old Lear (some sell for less than a most new 4 seat piston GA aircraft) more.

I hope someone in D.C. remembers…
Most AG aircraft are turbines…
as are all Medevac helicopters
and many bush planes and most firefighters…
not to mention the few non-business GA guys with turbine “toys”.

Hardly the “fat cat” rich guys the bill was meant to target.