Watch as GB News Chief Political Correspondent Katherine Forster tells Good Afternoon Britain that Number 10 was blindsided by Keir Starmer’s shock announcement that he is stepping down as MP for Holborn and St Pancras, triggering a by-election. Reform UK leader Zack Polanski has previously made his desire for a London seat known, raising the possibility that the Green Party leader could enter the race. #UKPolitics #Labour #KeirStarmer #UKNews #GBNews Keep up to date with GB News at gbnews.com or on X @GBNEWS Become a Friend of GB News: gbnews.com/friend