The heatwave is taking its toll of London's emergency services. With no let-up in the soaring temperatures, firefighters and paramedics have seen a surge in calls.
And as Londoners heed advice about coping with the heat, Thames Water said it has seen a 15% rise in the demand for tap water in the capital. Piers Hopkirk reports:
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.