New YouGov polling suggests large numbers of Londoners are prepared to vote tactically at the next general election to prevent Nigel Farage becoming Prime Minister. The survey indicates that in several potential Reform UK versus Conservative contests, voters may shift support strategically rather than back their first-choice party. In Outer London seats, Conservative support appears significantly stronger when tactical voting is factored in, while Labour and Liberal Democrat backing falls sharply in head-to-head Reform-Tory scenarios. In Labour versus Reform contests, Labour maintains a clear lead, with Conservative support collapsing. Where Labour faces the Conservatives, Reform voters appear willing to switch to the Tories, while Lib Dem and Green supporters may lend votes to Labour. However, Green voters show less inclination toward tactical shifts. The findings challenge earlier projections suggesting Reform could secure major gains or even a Commons majority.