Keir Starmer became the UK Prime Minister in July 2024 after Labour's landslide general election victory. This prediction market tracks whether he will leave office before the end of 2026, either through resignation, health reasons, loss of parliamentary confidence, or a snap election resulting in his removal from power. The question resolves YES if Starmer steps down or is forced out before December 31, 2026, and NO if he remains in office beyond that date. At 5% YES odds, the market currently reflects strong expectations that Starmer will remain Prime Minister through 2026, implying that political consensus sees an early exit as highly unlikely over the next year-plus window. The extremely low probability suggests traders view Labour's parliamentary position and Starmer's personal leadership as relatively stable despite typical UK political turbulence and opposition pressure. Odds movement will likely respond to key events: polling shifts, by-election results, government scandals, health announcements, or internal Labour party dynamics that might destabilize his premiership. Resolution is straightforward and binary: any confirmed departure from 10 Downing Street before January 1, 2027 triggers YES; otherwise the market resolves NO.