Market resolves to YES if the Nationwide House Price Index annual rate of change for December 2026, as published in the Nationwide Monthly House Price Report, shows that UK average house prices have increased by more than 5.0% compared to December 2025. A change of exactly 5.0% does not resolve YES — it must be strictly greater than 5.0%. Source: Nationwide Building Society monthly House Price Index report (nationwide.co.uk/about/house-price-index).