HM Treasury reported on 1 September 2026 that the Chancellor of the Exchequer had appointed Sir Keir Starmer to be Steward and Bailiff of the Three Hundreds of Chiltern, with the appointment made that same day, according to the department's news story.

The announcement named the office and the individual but gave no further context on the role, its duties or the circumstances of the appointment. No additional statements or details accompanied the notice, which was published by HM Treasury.