Traces of polonium was found on all sorts of airplanes (between UK and USSR) and all over the place. Many, many people had to be tested.
And yes, we might as well use the old name.
It was the guy that was his acquaintance that they had on camera flying into London, and then jetting back out.
I have to admit, I haven't followed up on that story in years, but my memory was that it was the "third" unidentified guy.
Oligarchs in the crosshairs of Parliament.
To be fair, the Brits gladly took their money and enabled the intrusion.
Guy found in apartment strangled to death.