The budget's effect on growth? Zero. Zip. Zilch. Nada.

The OBR confirms: this budget is tinkering around the edges.

The Chancellor closed his budget declaring that it was:

A Budget for a Britain that wants to be prosperous, solvent and free.

In actual fact, the budget is unlikely to do any of that. In fact, on the macro-scale, it will do precisely nothing. And that's not my estimate, that's the OBR's, which writes:

The Government has announced a number of policy measures that are expected to have a broadly neutral fiscal impact in aggregate between 2012-13 and 2017-18, with ‘giveaways’ almost exactly offsetting ‘takeaways’ over this period. Correspondingly, we also assume that they will have a broadly neutral effect on the economy, with no impact on the level of GDP at the end of the forecast horizon.

So the OBR thinks the fact that the budget is fiscally neutral means it is unlikely to have much effect on growth. But what about the medium-term changes?

The reduction in the main rate of corporation tax from 2015-16 has a small positive effect on business investment in our forecast, while the decision to abolish the contracted-out NICs rebate slightly reduces disposable income and household consumption. The Government has also decided to increase capital spending and reduce current departmental spending from 2015-16. Given the long time horizon and the fact that the overall net effect of these changes is relatively small, we have not adjusted our overall GDP forecast.

No change there then. It goes on and on. Introducing an allowance for employers' national insurance contributions:

Given the small size of these potential effects we have not made any explicit adjustments to our forecast.

The expansion of the Help to Buy scheme, the Build to Rent Fund, and the Right to Buy scheme:

…likely to have a relatively small additional impact on transactions and residential investment.

The only major impact assessed is with the cut in beer duty and fuel duty, which are likely to reduce CPI inflation by around 0.1 percentage points for 12 months.

That's it.

It's not a budget for prosperity, it's not a budget for growth. It's a budget for nothing at all.

Freya, the Number 11 cat. 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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Who will win the Copeland by-election?

Labour face a tricky task in holding onto the seat. 

What’s the Copeland by-election about? That’s the question that will decide who wins it.

The Conservatives want it to be about the nuclear industry, which is the seat’s biggest employer, and Jeremy Corbyn’s long history of opposition to nuclear power.

Labour want it to be about the difficulties of the NHS in Cumbria in general and the future of West Cumberland Hospital in particular.

Who’s winning? Neither party is confident of victory but both sides think it will be close. That Theresa May has visited is a sign of the confidence in Conservative headquarters that, win or lose, Labour will not increase its majority from the six-point lead it held over the Conservatives in May 2015. (It’s always more instructive to talk about vote share rather than raw numbers, in by-elections in particular.)

But her visit may have been counterproductive. Yes, she is the most popular politician in Britain according to all the polls, but in visiting she has added fuel to the fire of Labour’s message that the Conservatives are keeping an anxious eye on the outcome.

Labour strategists feared that “the oxygen” would come out of the campaign if May used her visit to offer a guarantee about West Cumberland Hospital. Instead, she refused to answer, merely hyping up the issue further.

The party is nervous that opposition to Corbyn is going to supress turnout among their voters, but on the Conservative side, there is considerable irritation that May’s visit has made their task harder, too.

Voters know the difference between a by-election and a general election and my hunch is that people will get they can have a free hit on the health question without risking the future of the nuclear factory. That Corbyn has U-Turned on nuclear power only helps.

I said last week that if I knew what the local paper would look like between now and then I would be able to call the outcome. Today the West Cumbria News & Star leads with Downing Street’s refusal to answer questions about West Cumberland Hospital. All the signs favour Labour. 

Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.