I should stress - as I did in a comment yesterday - that I think phone-hacking is a disgraceful practice. But the fact remains that, unless more revelations emerge, the case against Coulson has barely progressed since he resigned the editorship of the NotW in January 2007. Yes, the dubious practice was more widespread than most people knew (although not, surely, more widespread than they suspected) during the court case of Clive Goodman. But Coulson has still not been tied, irredeemably, into it all. So it puzzles me why Ann Clwyd is kicking up such a fuss about "Mr. Coulson's dubious reputation," without futher evidence and without having done so before.
Certainly, Coulson has questions to answer - and they'll most likely be put to him in due course. In the meantime, Team Cameron are rallying around him in a manner which suggests he'll keep his job. Despite the absence of fatal evidence against Coulson, this remains a politically difficult spell for them. But, without that fatal evidence, it's unlikely to be a game-changer.