If I was Labour, I'd proceed a little more carefully. Those of us who have been around a while remember just how close they were. I'd guess Rupert Murdoch will say that Blair was the first politician he was close to and Brown and Cameron wanted the same relationship.
It's a pretty open bet who is going to come off worst, but I think he liked Blair and Brown more than Cameron. And I suspect he will say they spent a lot more time courting him than he did them. Might make today look like a picnic!