An undercover television sting operation triggered an expanded investigation by London's Metropolitan Police into the financial records of Reform UK. The rightwing populist party is now the subject of a criminal probe focused on whether it sought illegal donations from foreign sources to support its political activities.

The police increased the scope of the financing inquiry following claims that the group attempted to bypass funding laws to secure overseas money. Authorities have not named the specific entities involved in the sting operation or provided a timeline for the conclusion of the criminal investigation.