Police have issued a correction after it emerged an athlete from Sierra Leone is still missing.
Officers earlier said Mami Konneh Lahun had been found but it appears the runner is still missing.
The 24-year-old has not been seen since finishing this weekend's London Marathon and was due to fly home today.
Police apologised for creating the confusion.
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The high of 35C was recorded on a Bakerloo line train between Piccadilly Circus and Oxford Circus at 2pm.
Weather forecasters say temperatures could reach 35C, beating the previous record of 34.6C in the scorching summer of 1976.
After years of political manoeuvring over the future expansion of Heathrow Airport, there has been an important development this lunchtime.