The Office for Budget Responsibility’s chief has resigned after the financial watchdog accidentally released its response to Rachel Reeves’s Budget.

Richard Hughes quit as its chairman on Monday, less than a week after the independent financial watchdog upended parliamentary procedure by unintentionally releasing its response to the Budget before the chancellor had even presented it to parliament.

It came after a damning report revealed mistakes at the very top of the organisation were responsible for the leak.

In a latter to Meg Hillier, chair of the Treasury Select Committee, Hughes admitted the OBR had made “a serious error”, but that the OBR was already taking steps to make sure it cannot happen again.

He said: “By implementing the recommendations in this report, I am certain the O

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