Health alerts for heat have been upgraded to amber for large parts of England by the UK Health Security Agency.
Yellow alerts had been in place across England until Monday, but they were upgraded on Friday morning for the east and west Midlands, London, the east of England and the south east and south west.
An amber alert means there is likely to be a significant impact on health and social care services due to high temperatures, including a potential rise in deaths among those over 65 or with pre-existing health conditions.
It also mean the heat could affect the delivery of health services and lead to an increase in the demand for power.
The amber alerts are due to end at 9am on Monday.
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