The UK Health Security Agency (UKHSA) has today released a revised protocol for managing extreme heat events, alongside a suite of public health tips aimed at mitigating the risks of the current heatwave. This is not a drill. The mercury is climbing, and the data is unequivocal: heat-related mortality rises sharply once ambient temperatures exceed 27°C. For the vulnerable, the elderly and those with pre-existing conditions, this is a matter of life and death.
The new protocol, effective immediately, mandates local health authorities to open cooling centres, increase street-level health patrols, and prioritise ambulance response times for heatstroke cases. It also introduces a colour-coded alert system: green for normal summer conditions, amber for moderate risk, and red for extreme danger. We are now in amber for most of the country, with red likely later this week.
The public health tips, while seemingly common sense, bear repeating. Stay hydrated, but not just with water. Electrolyte replacement is critical as you sweat out sodium and potassium. Avoid alcohol and caffeine. Wet your skin with a damp cloth or spray bottle; evaporation is nature’s own heat sink. Close curtains and blinds during the day, especially on south-facing windows. And for goodness sake, do not leave children or pets in parked cars. The interior of a car can reach 60°C within 20 minutes on a 30°C day.
But here is the physics of it: the UK is not designed for this. Our buildings retain heat, our infrastructure lacks widespread air conditioning, and our population is not acclimatised. The Urban Heat Island effect, wherein cities like London can be several degrees warmer than surrounding rural areas, amplifies the risk. We are now seeing what the models predicted decades ago: a doubling of heatwave frequency since the 1960s.
The UKHSA’s response is welcome, but it is a stopgap. The true solution lies in energy transition: decarbonising our grid, insulating our homes, and planting green roofs. Until we address the root cause, we will be rewriting these protocols every few years, as the baseline shifts upward.
For now, follow the tips. Check on neighbours. Keep an eye on the elderly. And remember: this is not weather. It is the physical reality of a warming world. Act accordingly.
