UK households are advised to stockpile five essential items before upcoming thunderstorms to prepare for potential power cuts. The Met Office warns of thunder and lightning storms after a recent heatwave, urging households to have torches, spare batteries, a backup charger for mobile phones, a battery-powered radio, and essential foods available. Official advice includes considering emergency supplies for a few days and preparing a car kit for wintry weather. In case of power cuts, dial 105 to report.