The worst aspect of this for Labour, though, is the timing. Sure, they wouldn't have chosen this at any point the campaign. But, with only a week left, it threatens to both obliterate eveything that's gone before and overshadow whatever Brown does from now until polling day.
And then there's the final TV debate. The audience has been asked to listen to the participants in silence - but you can't ban public sentiment, and it will be interesting to see whether any of that senitment bleeds through tomorrow.