British Prime Minister Boris Johnson has promised more help for families struggling with rising prices and bills after the government’s budget update was criticised for failing to go far enough to protect living standards. Talking to LBC radio on Thursday, Johnson said: “I think that the cost of living is the single-biggest thing we’re having to fix and we will fix it.” In his half-yearly budget update on Wednesday, Rishi Sunak, the Chancellor of the Exchequer, said he will cut fuel duty by 5 pence a litre ($0.25 per gallon) for the next 12 months. He raised the threshold at which people start paying national insurance contributions from July, and said the main rate of income tax will fall to 19 percent from 20 percent in 2024, when Britain is due to hold its next national election. Johnson said the Chancellor had “done a huge amount to try to address …