Mo Farah has sacrificed spending time with his family to concentrate on training. At one point he was spending so much time away, that one of his daughters didn't even recognise him.
Farah said: "She didn't recognise me. Now she's getting to know me a bit better. I've been giving her sweets and chocolate, kind of bribing her a bit!"
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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.