Britain's Prime Minister Boris Johnson speaks during a daily news conference to update on the coronavirus disease (COVID-19), at 10 Downing Street in London, Britain April 30, 2020. Andrew Parsons/No 10 Downing Street/Handout via REUTERS THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. NO RESALES. NO ARCHIVES. THIS IMAGE IS FOR EDITORIAL USE PURPOSES ONLY. THE IMAGE CAN NOT BE USED FOR ADVERTISING OR COMMERCIAL USE. THE IMAGE CAN NOT BE ALTERED IN ANY FORM.