One lobby group estimates 250,000 small firms are at risk of going bust. Bloomberg | Jan 25, 2021 (Bloomberg)—The U.K.’s third major lockdown to control the coronavirus could be the final straw for thousands of businesses struggling to pay rent and taxes with little or no money coming in the door. “It is costing us thousands of pounds a week, even being shut, and we have zero income,” said Andrew Wong, owner of the upmarket Chinese restaurant A. Wong in London’s fashionable Pimlico neighborhood. “I think all the time about shutting down and walking away, though I’m not going to do it.”