Cameron had wanted to spend the day electioneering and the audacity of the Speaker demanding that he attend first to his day job, was obviously a bit too much for prime minister, whom we know operates on a fairy short fuse, as indeed do many people promoted beyond their ability.
I just can't stand to watch of listen to him, or indeed any of the rabble at Westminster, so I haven't seen what happened, but by all accounts Cameron was tetchy all the way through, and made some remark to Dennis Skinner about it being time he retired (a bit rich from a bloke who is putting up retirement age and wants people to go on working for as long as possible, rather than take a pension...possibly because they won't have enough money to pay the pensions after they pay for the Olympics).
Now I happen to think that Bercow is an obnoxious little toad, way too full of himself for anyone's good. (He's been known to order people to clear the corridor for him and his entourage like some Middle eastern potentate.) But the truth of the matter is that, like it or not, the Speaker of the House of Commons is the blokey in charge of what happens in the Commons, and no matter what school Cameron went to or how many friends he has at Buck House, Bercow is his superior.
It was, at best, amateur of Cameron to let it be known that he was furious, and it was,again amateur to snap an ageist comment at 80 year old Skinner. (Not that I think that the Beast of Balsover will be bothering much about it; it won't have hurt him.) But it was "un-prime ministerial". It was insulting to parliament and to us that he was angry at having to give up electioneering to do his job.
I wonder if he's worked out a way to get Jeremy off the hook over this, or if, as I suspect, he is going to look a proper Charlie when Hunt eventually "resigns".