Britain began its third COVID-19 lockdown on Tuesday with the government calling for one last major national effort to defeat the spread of a virus that has infected an estimated one in 50 citizens before mass vaccinations turn the tide.br br Finance minister Rishi Sunak announced a new package of business grants worth 4.6 billion pounds (RM24.8 billion) to help keep people in jobs and firms afloat until measures are relaxed gradually, at the earliest from mid-February but likely later.