Market resolves to YES if the ONS Consumer Prices Index (CPI) 12-month rate for December 2026, as published in the ONS monthly CPI bulletin in January 2027, is at or below 2.0%. A December 2026 reading of exactly 2.0% resolves YES. UK CPI stood at 3.0% in February 2026 (ONS). The Bank of England's target is 2.0%. Source: Office for National Statistics CPI bulletin (ons.gov.uk).