"You're welcome. And-- thanks." He rolls his eyes back at John, like to say "yes but if she had..." And he should probably explain. "Actually, that wasn't for fanciness. The Mondas-- I should tell you what that is first. Earth's twin planet, way out there. It's not clear exactly how things started up, but somewhere along the way, Cybermen were getting made and taking over. Anyway, those Mondas types for some reason have this allergy to gold, so if Tosh had been cyberized at all... I think you get the idea?"
He regards Ianto and John, and then Tosh. They can't let it go too long without figuring this out for sure. "Tosh, going to need your arm for the blood draw. Pick an arm."