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Polly Powell, 39, launched the campaign after her son, Jack Pullan, 13, was threatened with detention for taking 'smart shorts' to school in sweltering 86F heat.
More than 300 parents added their support to the petition after the incident on Monday, and Ysgol Dyffryn Aman school in Carmarthenshire agreed to change its policy.
Chief meteorologist Steve Willington said: 'The high pressure that has dominated our weather of late is starting to move away, allowing fresher air in from the west.'A cold front that will pass through the UK will mark an end to the hot spell of weather in the south and bring cloudier skies and lower temperatures.' Elsewhere the heat meant disruption to routines across the land.
ITV's Good Morning Britain, hosted by Piers Morgan and Susanne Reid, was forced off the air at 7am with Mr Morgan blaming high temperatures affecting equipment.
The sweltering temperatures resulted in 'unprecedented demand' for ambulance services in London, with people fainting, collapsing and becoming unconscious in the heat. Defra said that while the general population will be fine in moderate levels, those with lung or heart problems should consider reducing their levels of strenuous outdoor activity Parts of the country faced increased air pollution as the Department of Environment, Food and Rural Affairs predicts rates of seven to eight out of their scale of 10 in some areas.