Almost two years after the 2012 Olympic Games, Olympic Park has opened its doors to the public. There were acrobats and performers at the official opening, along with a parade of school children. The famous Orbit statue has now opened as a viewing platform.
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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.