The Queen was reportedly in "good spirits" today as she continued her recovery in hospital after being admitted with symptoms of gastroenteritis.
The Queen was well enough yesterday to meet an employee privately to award her a medal for long service before travelling by private car to the hospital.
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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.