https://www.techdirt.com/articles/20170820/19053438050/gchq-knew-fbi-wanted-to-arrest-malwaretech-let-him-fly-to-us-to-be-arrested-there.shtml

It looks like the UK found an easy way to avoid another lengthy extradition battle. Its intelligence agency, GCHQ, knew something security research Marcus Hutchins didn't -- and certainly didn't feel obliged to tell him. Not only that, but it let a criminal suspect fly out of the country with zero pre-flight vetting. (Caution: registration wall ahead.)

Officials at the intelligence agency knew that Marcus Hutchins, from Devon, who was hailed as a hero for helping the NHS, would be walking into a trap when he flew to the US in July for a cyber-conference.