LONDON (Reuters) - Prime Minister Boris Johnson told his staff in No. 10 Downing Street he was fit and well after being forced to self isolate and that he was focused on combating coronavirus and levelling up across Britain. After a torrid week when two of his most senior advisers announced their departures from Downing Street, Johnson has tried to signal that his government was moving on with what he has repeatedly called its “ambitious” agenda. That was somewhat stymied when he was told to self isolate on Sunday. “This morning the PM gave an address via Zoom to all No. 10 staff, saying that he is fit and well but has been pinged by NHS Test and Trace so has to self-isolate,” his spokesman told reporters. “He thanked his political and civil service teams for all of their hard work and said the ambition of this government is absolutely undimmed and if anything growing the whole time,” the spokesman said.