A ban on filming in court will be lifted for the first time in 90 years later, when cameras record proceedings at the Old Bailey. Cameras will film real cases at the Court of Appeal.
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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.