The by-election in Holborn and St Pancras, triggered by Keir Starmer’s September resignation and scheduled for 8 October, features Labour’s Sagal Abdi-Wali as the strong favourite and Green leader Zack Polanski as the main challenger. This leaves third place open among Reform UK’s Peter Newman, the Conservatives’ Ewan Cameron, Liberal Democrat Patrick Stillman, George Galloway’s Workers Party, and several independents or minor-party candidates. With nominations closing in mid-September and no constituency polls released, trader pricing reflects uncertainty over national trends—such as Reform’s broader support—versus local dynamics in this inner-London seat, where vote splitting among smaller contenders sustains closely matched probabilities for third. Late campaign activity or turnout variations could still shift the outcome before polls close.