Impossible to live with?
All criticism aside, they might have very well found alien life even when using terribly shaky science. Simply because if the hypothesis is right, the chance on finding aliens raining down would be quite high. It might not differ that much at first glance from life on Earth, following that same hypothesis. How to do this experiment better with limited budget and interest, I wonder?
The Telegraph has Prof Wainwright adding: "If the ratio of certain isotopes gives one number then our organisms are from Earth, if it gives another, then they are from space."
And the tongue in cheek:
"The tension will obviously be almost impossible to live with."
C'mon people, they go out on a limb and try to be the first to capture alien life. It's as scientific as the Nostromo landing on a planetoid and poking through some mysterious eggs, then bringing back the infected inside their ship. But it might still be the harbinger of greater things to come :)