It's true that one bad call doesn't make you a bad source. However has Jim White ever called a story for United? I can't think of one. If he was regularly breaking United stories, or even if he'd broken a few I'd put some faith into him but I don't think he's clued in at all for United from what I can remember
Not saying to trust him or not on this call, even though it seems it was broken by Guardian before him anyway. I'm talking in general.