Britain's Government Security Group has launched an investigation into how details of bank tax changes emerged hours before Chancellor John Healey announced them in the October 28 Autumn Budget.
Bloomberg reported that the Bank Corporation Tax Surcharge would rise by less than 8%, prompting bank shares to rally ahead of the official announcement.
Treasury Permanent Secretary James Bowler told the Treasury Committee that no banks or trade bodies received advance briefings, although he acknowledged that knowledge of the plans had necessarily widened within government shortly before the Budget.
Healey is due to face questions from the Committee on Wednesday, as concerns over Treasury information security continue.
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UK launches investigation into bank tax budget leak https://t.co/xSXvEWrIRC
— Reuters (@Reuters) November 11, 2026
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