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People cool off in a fountain in Lyon as a heatwave hits France, on May 27, 2026. [AFP]

The UK's Royal Life Saving Society on Wednesday issued warnings on water safety after nine people died in the sea, rivers and lakes during days of record-breaking hot weather.

Tuesday saw the records for the hottest day in May broken in England and Wales, with temperatures reaching 35.1C at Kew Gardens near London.

Seven of the nine water-related deaths reported by police in England and Wales since Sunday have involved teenagers or young children.