Radical cleric Abu Qatada was arrested in London this morning.
The move came as Home Secretary Theresa May prepared to update MPs on the steps being taken to deport him to Jordan.
The 51-year-old has been described by a judge as Osama bin Laden's right-hand man in Europe.
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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.