Police bosses plan to move from Scotland Yard as they face making cuts of more than £500 million.
Deputy Commissioner Craig Mackey told the Mayor's Office for Policing and Crime that the force hopes to save around £6.5 million per year by moving to a smaller headquarters.
New Scotland Yard has been in its current location in Victoria Street since 1967 but Mr Mackey said it would take an investment of around £50 million to bring the building up to scratch.
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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.