Nigel Farage's Reform UK party won a narrow by-election in Runcorn and Helsby, gaining its fifth MP, Sarah Pochin, who defeated Labour's Karen Shore by just six votes. The victory, attributed to an anti-immigration platform and criticism of Labour's welfare cuts, marks a significant moment for Reform UK, which is gaining popularity and positioning itself as the main opposition party. Labour's Brian Leishman emphasized the need for change to avoid an extreme right-wing government.