The head of the Office for Budget Responsibility, the watchdog that marks the Treasury’s homework, has resigned after the organisation inadvertently leaked all of last week’s budget two hours early.

Richard Hughes said he took full responsibility for the failure.

Earlier in the day, Prime Minister Keir Starmer confirmed that he and Chancellor Rachel Reeves had considered a significant breach of their election manifesto before the budget.

But he insisted they had not misled the public about the improved OBR forecast that led them to change their minds over raising income tax rates.

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