Anne Wilson, head teacher of Fircroft Primary School in Tooting, has paid tribute to pupil Imani Green, who was shot dead in Jamaica during a family visit to the country.
"The entire Fircroft School community is deeply shocked and saddened by the tragic news of the death of our pupil Imani Green. Our thoughts and prayers are with her family to whom we pledge our continuing love and support."
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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.