There is recent precedent. Last October the OBR added 0.25ppts to its rates forecast to anticipate the inflationary impact of the budget on markets www.bloomberg.com/news/article...

There is an OBR growth downgrade coming but she’ll pin that on Tory austerity and Brexit for hammering productivity 7/

www.bloomberg.com/news/article...

The ambition is to increase the headroom from £9.9bn alongside move to one OBR assessment, to restore policy stability and reassure markets 6/
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She wants to lower inflation via regulated prices, to help bring down borrowing costs which have been the “fastest rising item of gov spending,” she told C4 5/

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Welfare cuts will be found, which could restore some of the government’s lost credibility with markets since the damaging u-turn. The Times reported that £1bn may be saved from Motability benefits 4/
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She looks likely to give business a reprieve from more tax rises in a bid to make the budget “pro-growth” 3/

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She seems reluctant personally to do a bank tax but it remains on the table 2/

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Reeves has confirmed this, telling Times Radio “The IMF have said that we should move to just one major fiscal event a year and I agree … we do need to change the way that the OBR do their forecasting and two full forecasts a year make it harder to have that one fiscal event.”

Tallies with IFS finding last year that middle earners are paying less income tax and NICs than at any point in the past 50 years
ifs.org.uk/publications...

The Companies House filings are public now and reveal the Foreign Office made Mandelson divesting his 21pc stake (£6m-ish) in GC a requirement of him becoming ambassador. It didn't happen and the FO was putting the pressure on. find-and-update.company-information.service.gov.uk/company/1053...