Key facts
- The Treasury Committee said the Government Security Group started an investigation into a potential budget leak.
- The committee said the leaked measures may have moved financial markets.
- The statement gave no detail on the measures involved, the timing of the leak or any suspects.
Britain's Government Security Group has started an investigation into a potential leak of budget measures that may have moved financial markets, the Treasury Committee said in a statement on Tuesday, according to a Reuters report published on November 10, 2026.
The statement, as reported, gives no detail on which measures were involved, when the leak is alleged to have occurred, or who is suspected. It also does not state whether any market move has been established or quantified.
The Government Security Group is the part of the UK government that handles security matters across the civil service. The Treasury Committee is a parliamentary committee that scrutinizes the work of the Treasury and related bodies.