LONDON – The British government is on Friday set to announce further support for firms to retain staff in the coming months if they are forced to close as a result of the imposition of further lockdown restrictions.With the government expected to tighten restrictions over the coming days to deal with a sharp spike in new coronavirus infections, there are growing concerns that the economy will suffer during the winter and that hundreds of thousands of jobs may be lost.Treasury chief Rishi Sunak said he understood how “people are worried about the coming winter months.” He is being urged by businesses, politicians and unions to accompany any lockdown restrictions with a financial support package to prevent mass unemployment.