Sadiq Khan has warned Londoners affected by record energy price hikes could die this winter as he accused the government of “going AWOL” on the cost-of-living crisis.The London Mayor said inaction from Westminster had led to parents going hungry so their children can eat school meals - and others attempting to heat homes using dangerous methods.Mr Khan was speaking at the Notting Hill Carnival where one in eight float and sound system performers pulled out because they can’t afford to pay their bills.