A Heathrow expansion U-turn by David Cameron would be an "off-the-scale betrayal" a Tory MP has said.
Zac Goldsmith, MP for Richmond Park & North Kingston, whose seat would be affected by a third runway, said the move would make voters question whether the Prime Minister could be trusted, and would be "catastrophic' for Mr Cameron's reputation.
Government-appointed Airports Commission is due to outline its initial thoughts in a report next week. Mr Goldsmith has questioned its independence and suggested that accepting its findings would, in effect, be supporting the expansion of Heathrow.
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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.