Official temperature observations from London City Airport station confirmed a daily maximum of 30°C on May 23 under a strengthening high-pressure system advecting warm southerly air across southeast England. Met Office guidance and ensemble model runs aligned closely with this outcome, citing mostly clear skies, light winds, and peak insolation that supported afternoon readings clustered around the 28–30°C range. Trader consensus at 100% on 30°C reflects the tight clustering of verified data and minimal spread in post-event analyses. Scenarios that could realistically alter the result remain limited to rare station calibration adjustments or unverified microclimate variations, though historical precedent for late-May blocking highs makes such revisions improbable.