Britain could see 40°C heat within 12 years. Cities must prepare now.

The UK's hottest summers on record arrived back-to-back in 2025 and 2026. The Met Office now says there's a 50-50 chance of 40°C days in the next 12 years. That matters because power grids and city planners are already building for the future—and they need to plan for this heat from the start.