LONDON (Reuters) - British Prime Minister Boris Johnson said he was perfectly well after coming into contact with someone with COVID-19 and will drive the government forward via Zoom while he self-isolates for two weeks in Downing Street.Johnson’s latest brush with COVID comes after a tumultuous week in which his most senior adviser, arch Brexiteer Dominic Cummings, was ousted after clashing with a rival faction led by his fiancée and his new spokeswoman. From a flat above Downing Street, Johnson will have to grapple with Europe’s deadliest COVID-19 outbreak and master the delicate diplomacy needed to clinch a last-minute Brexit trade agreement within days.