They claim it's completely innocent, as the codenames are randomly generated. Of course, adding "Wink wink, nudge nudge, say no more" might have undermined that defense.
But what about next time? It's possible that Obama could travel to the U.K. again. I mean, he may discover he's also Wells, and that would mean a trip to his ancestral home, where he'd talk about coming from a long line of Welsh Obamas.
We can help. We can come up with a list of approved codenames for Obama.