Official Met Office observations for May 22, 2026, recorded a peak of 28°C in London, locking in the market’s near-certain outcome. A strengthening high-pressure ridge over southern England combined with light southerly winds advected warmer continental air under largely clear skies, producing afternoon maxima near the upper end of late-May climatological norms. European model consensus aligned closely with these conditions, limiting upside potential from enhanced insolation or local effects. Only unexpected revisions to station data or rare microclimate variations at the official Heathrow anchor site could realistically alter the result, scenarios now assigned negligible probability given the finalized readings.