Labour’s plan to embarrass Nick Clegg and the Lib Dems over Lords reform has backfired spectacularly. "Why would we want to hand the Lib Dems a victory?" went the logic of Labour’s decision to two-facedly vote for the Bill but against the programme motion that gave it any chance of seeing the light of day. But what chumps they look now. Nick is left looking like the Miss Haversham of British politics, deserted at the altar of constitutional reform while the groom has a fistfight with his family in the car park. And trust me, everyone always ends up feeling sorry for the jilted bride.

But fear not, Labour MPs. Your war gaming may not have played out just as you expected. But there is a small consolation. You have probably just finished the career of David Cameron, ended any hope of this government doing much else of any worth in the foreseeable, and probably won the next general election to boot.

Cameron looks now like a weak and defeated leader – as the always excellent Jonathan Calder puts it, the new John Major of Conservative politics. Unable to control his backbenchers, he must be gloomily contemplating the hand that fate has dealt him. All over Westminster, Conservative rebels have been drinking the bars dry and celebrating showing the "leadership" – if we can still call it that – who’s boss. "Rebellion is the new cool", I saw tweeted tonight, quoting one Tory backbencher. I’m guessing it wasn’t Peter Bone. But they’ve got a taste for it now, and they know that with enough numbers, they can get the PM to back off. How Cameron must already be regretting his decision not to whip this one properly.

And having got a taste for rebellion, the Tory right will want more, more, more. The snooping bill, EU referendum, a British Bill of Rights. They’ll be clamouring for the lot. But they won’t get it. I doubt there’ll be many Lib Dem MPs willing to hold their noses for Tory policy going forward.

So the rebels won’t get anything they want. And they’ll blame Cameron for that. Ostensibly for not putting us in our place – but really because they’re still furious with him for not winning a majority at the last General Election. And so the rancour and the poison will continue.

And where will it end? Well, we have a Prime Minister, unable to deliver on his coalition promises, under the thumb of rebellious backbenchers, but incapable of satisfying their demands, behind in the polls and all the while becalmed in an austerity driven economy.

Major can probably tell Cameron how this ends ...