TOPSHOT - Trolleys piled high for delivery are seen as shoppers queue at the checkout of a supermarket in London on March 14, 2020, as consumers worry about product shortages, leading to the stockpiling of household products due to the outbreak of the novel coronavirus COVID-19. - British Prime Minister Boris Johnson, who has faced criticism for his country's light touch approach to tackling the coronavirus outbreak, is preparing to review its approach and ban mass gatherings, according to government sources Saturday. (Photo by JUSTIN TALLIS / AFP)