The Royal College of Art is holding its annual secret postcard sale in ten days time at its centre in Battersea. Hundreds of postcard-sized artworks are up for sale but buyers won't know who the artist is until they buy one and then check the signature on the back.
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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.