British Prime Minister Rishi Sunak, anticipating potential defeat in the upcoming election, will warn voters on Monday that only his Conservative Party can effectively oppose a Labour-led government. He will caution against voting for Nigel Farage's Reform UK, arguing that it would splinter the right-wing vote and weaken the opposition to Labour. Sunak, facing polls indicating a significant lead for Labour under Keir Starmer, will highlight the risk of a Labour government unchecked by a strong opposition.