A spokesman from the Yvette Cooper campaign writes today:

So, on behalf of Yvette’s Leadership Campaign, I am today making these promises:

If anyone is speaking on behalf of the campaign, they will do so explicitly on the record. There will be no unattributed negative briefings about other candidates because that’s not the kind of politics Yvette has ever wanted to champion
If anyone else is speaking to you and claiming to do so on Yvette’s behalf and wants to criticise opponents – you can take it from me that they do not speak for the campaign or Yvette – and if she or I get to hear about it they will have lost our trust and our respect. I hope that all of the candidates will join me in making that pledge
If Yvette disagrees with things the other candidates are saying she will say so herself – on the record or in interviews.

We want this campaign to be about the best Labour has to offer. Negative briefing has no place in this debate.

This would be the same Yvette Cooper that is married to Ed Balls.

Pity, there was Guido beginning to enjoy the incoming chatter…