LONDON – The U.K. government plans to offer a first dose of COVID-19 vaccine to every adult by September as the nation’s health service battles the worst crisis in its 72-year-history.Foreign Secretary Dominic Raab said Sunday that the government is still opening new vaccination sites and will soon begin trials that will give round-the-clock injections at some locations to help increase the pace of delivery.“Our target is by September to have offered all the adult population a first dose,’’ he told Sky News.