epa08823024 (FILE) - Britain's Prime Minister Boris Johnson departs Downing Street to attend the National Service of Remembrance, on Remembrance Sunday, at The Cenotaph in Westminster, London, Britain, 08 November 2020. According to Johnson's spokesperson, 'the Prime Minister was notified by NHS Test and Trace that he is required to self-isolate as a contact of someone who has tested positive for Covid-19. The Prime Minister has no symptoms of Covid-19 and will continue to work from Downing Street. Boris Johnson has already once caught the virus, he was discharged from St. Thomas' hospital on 12 April 2020 after receiving treatment. EPA/VICKIE FLORES