Source: Independent [UK]
“Britain’s Government Security Group (GSG) has launched an investigation into a potential leak of Budget measures, which may have moved financial markets. It comes after a Bloomberg article published before the Autumn Budget on October 28 contained accurate details of planned changes to bank taxes. … The Treasury Committee said in a statement on Tuesday that a probe in the Cabinet Office is underway, despite assurance that no banks, their representatives or their trade bodies were briefed by the Treasury on the details of the Budget.” (11/10/26)
https://www.independent.co.uk/news/uk/home-news/uk-budget-2026-leak-investigation-b3082531.html