The Treasury has launched an inquiry into autumn budget leaks after a chaotic build-up to Rachel Reeves’s economic statement last week.

The Treasury minister James Murray said the department’s permanent secretary, James Bowler, would review “security processes” to inform future events.

“The government put the utmost weight on budget security, including the prevention of leaks of information,” Murray said on Wednesday.

“A leak inquiry is now under way with the full support of the chancellor and the whole Treasury team.”

It comes after major policies such as a freeze on income tax thresholds, a pay-per-mile levy on electric vehicles and a tourist tax were reported by the media before the budget on 26 November.

The Conservatives have claimed the leaks were unprecedented and part of

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