A panel of judges will begin hearing an appeal by Abu Qatada to be freed while he fights extradition to Jordan. The radical cleric has been sentenced in his absence to life imprisonment with hard labour for conspiracy to carry out terror attacks.
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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.