On Thursday 25 April from 9am, 10, 000 members of the public will be able to register for a fun run with a difference - they'll get to cross the Olympic finish line. Entry costs £27.50 (or £7 for family run entry) so register here.
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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.