Britain's Fiscal Compass Under Fire: The OBR's 'Millstone' Model Faces a Reckoning

The UK's economic policymaking is on the brink of a significant re-evaluation, as the Trades Union Congress (TUC) escalates calls for a comprehensive “root and branch” review of the Office for Budget Responsibility (OBR). This challenge, directed squarely at the new chancellor, John Healey, targets the independent forecaster's core methodologies, claiming they actively suppress economic growth by underestimating the power of public investment.

### The Call for a 'Root and Branch' Review

Paul Nowak, the TUC’s general secretary, has been unequivocal, stating the OBR has “for too long… been a millstone preventing good growth across the country.” The union umbrella body is urging Healey to use his first budget on 28 October to re-examine the watchdog’s assessments, specifically criticising its assumption that public investment inherently “crowds out” private capital. This view, which Nowak describes as baking in “false assumptions” of austerity, is not isolated, echoing similar demands from a spectrum of thinktanks, including Progress and the New Economics Foundation.

### Outdated Maps for a Modern Economy?

Louisa Dollimore of the Good Growth Foundation thinktank previously likened the OBR to “a backseat driver with out-of-date maps,” asserting that its approach “obstructs long-term planning and investment at a moment when Britain needs both.” This growing chorus suggests that the OBR's models, designed for a different economic era, may be providing a skewed perspective on investment benefits. The argument hinges on whether public spending stifles or stimulates private sector activity, a foundational debate with profound implications for national strategy, especially with Andy Burnham's pledge for “good growth in every postcode.”

### Leveraging Public Capital: Beyond 'Crowding Out'

The TUC's critique extends to actionable policy proposals, advocating for the chancellor to bolster investment bodies such as the National Wealth Fund (NWF) and the National Housing Bank. This push leverages the flexibility built into the fiscal rules revised by Healey's predecessor, Rachel Reeves. Under these rules, government borrowing matched by a financial asset – such as a share in a company or a loan – does not count against Treasury targets. The TUC contends this provision should unlock significant additional investment, allowing institutions like the NWF to back British businesses and infrastructure projects, thereby “crowding in” private investors rather than displacing them.

### A New Helmsman, A Troubled Outlook

This re-evaluation of the OBR coincides with a transition at its helm. Jonathan Haskel, a former member of the Bank of England’s monetary policy committee, was recently picked as the next chair, following Richard Hughes's resignation last December after the OBR inadvertently published budget details in advance. Haskel, tasked with overseeing a new economic forecast for this year's budget, has already expressed a cautious outlook to MPs on the Treasury select committee. He stated his forecast would be “in the medium term of somewhat higher interest rates and weaker GDP growth than most are expecting,” and grimly noted that Britain was “not in a very good fiscal position.” This frank assessment from the incoming chair adds another layer of urgency and scrutiny to the TUC's demands for a review, highlighting the high stakes involved in how Britain's economic future is charted.