So, Gordon Brown has gone on the record on GMTV to deny he authorised briefings against Alastair Darling. Let's, for once, take him at his word. So if it wasn't him who told Dastardly and Mutley - sorry, Whelan and McBride - to sully the Chancellor's name, who was it?
Oh dear, there's only one other person it could have been. Step forward, Ed Balls, the man who was desperate to take on Darling's job.
Someone should ask him the question directly. If he denies it, we will know that either he or the Prime Minister is telling a Brownie, as Fraser Nelson would put it.
There is of course a third possibility - that Whelan and McBride did it off their own bats.
Nah, I don't think so either.