John Allan, chairman of Tesco Plc, told the BBC's Sunday Morning Live that low-income households have difficulty choosing between food and heat this winter. Budgets are tight, triggering a 'winter of discontent' if widespread inflation doesn't diminish. 

"In some ways, the worst is still to come – because although food price inflation in Tesco last quarter was only 1%, we are impacted by rising energy prices. Our suppliers are impacted by rising energy prices. We're doing all we can to offset it … but that's the sort of number we're talking about. Of course, 5%," Tesco's Allan said.