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A four-week-old boy is among ten children who have been admitted to hospital since the hot weather began.
Six of the ten patients, the oldest of which is 14 needed specialist treatment at the Queen Victoria Hospital in East Grinstead, Sussex, due to the severity of their sunburn.
As wildfire warnings are issued across the country, it has been "another busy night" for fire crews:
Fire crews in Mid and West Wales have been tackling blazes that include grass fires and a BBQ fire:
Insurers have warned wildfires could put lives at risk and cost millions of pounds in damaged crops and machinery as the longest UK heatwave for seven years continues.
Tim Price, of NFU Mutual, said: "The tinder-dry conditions and continuing heatwave pose a major fire risk to the countryside, threatening crops, equipment and even personal safety.
"Every precaution needs to be taken by both farmers and visitors alike."
Farmers have been urged to ensure that their fire extinguishers are well maintained and to reduce the risk of combine harvesters catching fire by regularly cleaning the machinery to remove chaff and dust.
The heatwave over Britain is showing little sign of relenting. High temperatures today has melted roads and sparked wildfires in the countryside.
A&E departments said they have had their busiest week of the year as a level 3 heat warning remains in place over western England.
Rupert Evelyn reports:
A grass fire in Epping Forest, in south east London is now "under control", the London Fire Brigade said today.
Pictures: Tarmac melts on road in Cambridge
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After several deaths as people try to avoid the heat - a look at why swimming in quarries and open water is so dangerous.
Heatwave health warnings were issued today as the Met Office declared it was the hottest day of the year so far.