[NitpickLawyer]

> they can just ignore it.

Eh, maybe? Maybe not? What if years later someone from that company flies through the UK? And if you think you can avoid connecting flights there, what if a flight from NY to CDG has to do an emergency landing and chooses somewhere in the UK?

[roblabla]

If you're that paranoid, you _can_ just chose not to fly.

The bigger problem is if the UK has an extradition treaty with the country you live in.