As autumn descends upon the UK, the weather is set to become chillier and millions of households will soon be embroiled in the annual debate of when to turn on the heating. The NHS advises that indoor temperatures below 15C can pose health risks, particularly for the elderly or vulnerable.

To eliminate the guesswork, energy specialists at Construction Megastore have analysed Met Office data (merging historical records with current forecasts) to determine the official "switch-on" dates for every major UK city, reports Plymouth Live . Robert Quinton, an expert in energy, construction and insulation, stated: "The best time to switch your heating on is when temperatures consistently fail to reach 15C during the day. Waiting until it's much colder can risk both your health and your boiler, e

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