Barely a year has passed since Rishi Sunak’s first Budget. Its centrepiece was a £30 billion stimulus designed to calm nerves about Covid-19 even though barely 500 cases had been diagnosed in the country. The Commons chamber was packed, with not a mask in sight. Few that day would have thought that in a year’s time the country would be in its third national lockdown and the economy would have suffered its worst slump since the Great Frost of 1709.