It is feared thousands of people could die as temperatures look set to soar to new highs, potentially even hitting a record 40C in some places.
With temperatures set to soar on Monday and Tuesday, the government held its second emergency Cobra meeting in three days on Saturday, to discuss preparations for the dangerous heatwave just hours away from striking Britain.
Schools, hospitals and businesses are all making cancellations and adjustments to keep people out of the sun, while the health secretary has called on everyone to look out for their more vulnerable neighbours, over the next three dangerous days.
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