The demolition of part of an east London terrace is due to get underway today after cracks in the building were spotted over the weekend.
Officials are hoping to save four flats and a restaurant in another section of the structure, but one other restaurant and three flats will be knocked down first.
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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.