Is the double-dip no more? Does it matter?

Maybe, and no. No it does not.

Last Friday, the ONS revised its estimates of the size of British construction output over 2012. It now thinks that the construction sector shrank by 5 per cent in the first quarter of that year, compared to the 5.4 per cent contraction it had previously estimated. (Although that's good news, the picture is less rosy for the other three quarters of the year, which were all revised downwards.)

That upward revision would be enough to bring the overall growth figure for Q1 2012 to exactly zero; hence the Saturday Mail story dubbing it "The double-dip that never was! Osborne gets a surprise boost as 'growth' was 0.0% rather than -0.1%".

There are two things to say at this point. Firstly, the nitpicking: the ONS is also due to announce the latest revisions to the service sector on the 23rd of this month (estimates for production, the third main component, were published on the 9th). Those revisions could be in either direction, and, given the size of services in the overall economy, it would not take a large downward swing to wipe out the "gains" from production. So it's too early to say for certain that the double-dip has been erased.

But the broader point is that it does not matter, and has never mattered, whether the economy grew by 0.1 per cent, didn't grow, or shrank by 0.1 per cent. What is important is that Britain has stagnated for the better part of two years running now. Anaemic growth is just as bad as a mild recession – and in some ways worse, because while a recession may be expected to spring back into recovery at some point, stagnation can last for decades. Just ask Japan.

That's the reason I've focused on the description of our economy as "corrugated". We focus so much on the ups and downs, with cheers alternating on either side of the aisle, that we neglect to take a step back and look at what the overall trend is. The fact that the economy was precisely stagnant in the first quarter of 2012 doesn't change that trend for the better; it makes it overwhelmingly clear that stagnation remains the reality we live in.

Of course, some will claim that this revision matters anyway, because it means that we never had the technical recession which garnered so much bad press last year. But – you can guess where this is going – technical recessions are an alarmingly misleading thing to focus on in an economic environment like ours. Because, again, in a corrugated economy, whether a particular consecutive pair of quarters displays slightly negative growth is basically down to chance. What is not down to chance is the overall pattern.

This is what our economy looks like, right now:

Until and unless that flat black line stops being quite so astonishingly flat, there is little to celebrate. Arguing about the size of the kinks within it is little more than trivia.

A construction site. The sector's performance in 2012 was revised up, causing some to dismiss the double dip recession. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Emily Thornberry heckled by Labour MPs as tensions over Trident erupt

Shadow defence secretary's performance at PLP meeting described as "risible" and "cringeworthy". 

"There's no point trying to shout me down" shadow defence secretary Emily Thornberry declared midway through tonight's Parliamentary Labour Party meeting. Even by recent standards, the 70-minute gathering was remarkably fractious (with PLP chair John Cryer at one point threatening to halt it). Addressing MPs and peers for the first time since replacing Maria Eagle, Thornberry's performance did nothing to reassure Trident supporters. 

The Islington South MP, who voted against renewal in 2007, said that the defence review would be "wide-ranging" and did not take a position on the nuclear question (though she emphasised it was right to "question" renewal). She vowed to listen to colleagues as well as taking "expert advice" and promised to soon visit the Barrow construction site. But MPs' anger was remorseless. Former shadow defence minister Kevan Jones was one of the first to emerge from Committee Room 14. "Waffly and incoherent, cringeworthy" was his verdict. Another Labour MP told me: "Risible. Appalling. She compared Trident to patrolling the skies with spitfires ... It was embarrassing." A party source said afterwards that Thornberry's "spitfire" remark was merely an observation on changing technology. 

"She was talking originally in that whole section about drones. She'd been talking to some people about drones and it was apparent that it was absolutely possible, with improving technology, that large submarines could easily be tracked, detected and attacked by drones. She said it is a question of keeping your eye on new technology ... We don't have the spitfires of the 21st century but we do have some quite old planes, Tornadoes, but they've been updated with modern technology and modern weaponry." 

Former first sea lord and security minister Alan West complained, however, that she had failed to understand how nuclear submarines worked. "Physics, basic physics!" he cried as he left. Asked how the meeting went, Neil Kinnock, who as leader reversed Labour's unilateralist position in 1989, simply let out a belly laugh. Thornberry herself stoically insisted that it went "alright". But a shadow minister told me: "Emily just evidently hadn't put in the work required to be able to credibly address the PLP - totally humiliated. Not by the noise of the hecklers but by the silence of any defenders, no one speaking up for her." 

Labour has long awaited the Europe split currently unfolding among the Tories. But its divide on Trident is far worse. The majority of its MPs are opposed to unilateral disarmament and just seven of the shadow cabinet's 31 members share Jeremy Corbyn's position. While Labour MPs will be given a free vote when the Commons votes on Trident renewal later this year (a fait accompli), the real battle is to determine the party's manifesto stance. 

Thornberry will tomorrow address the shadow cabinet and, for the first time this year, Corbyn will attend the next PLP meeting on 22 February. Both will have to contend with a divide which appears unbridgeable. 

George Eaton is political editor of the New Statesman.