A new piece of environmentally-friendly engineering could see water bills come down in price.
Thames Water is planning a new project that will convert the waste that flows from sewage works into electricity. The £250 million project could generate up to 20% of their energy needs.
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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.