Health services in the UK are urging the public to follow heat-safety guidance as the Met Office issues an extreme weather “red” warning for parts of the country. Multiple outlets report that the NHS is promoting a specific approach to seeking medical help in very hot conditions, advising people to cool themselves and to contact emergency services if symptoms do not improve within a short period. One report describes a “30-minute rule” for calling 999 if a person’s condition is worsening or not improving after cooling measures. The warning is linked to forecast temperatures reaching the high end of the heatwave range. Coverage says a red extreme heat alert comes into force over several days, with timing varying by report, and notes that temperatures could reach around 38C to 40C in some areas of England and Wales. The guidance reflects concerns about heat-related illness, particularly for vulnerable groups. The Met Office warning signals conditions where there is a risk to life if appropriate precautions are not taken.