Starmer stood down as MP on 1 September; by-election date still to be set.
Market resolves to YES if the Labour Party candidate is declared the winner of the UK parliamentary by-election in Holborn and St Pancras triggered by Sir Keir Starmer standing down as MP on 1 September 2026. Resolution is based on the official result declared by the returning officer. If the by-election has not been held by the resolution date, the market resolves NO. Source: UK Electoral Commission / official constituency declaration.