(200318) -- LONDON, March 18, 2020 (Xinhua) -- A notice is seen at an entrance to a theatre in West End in London, Britain, on March 17, 2020. As many as 1,950 people have tested positive for COVID-19 in Britain as of Tuesday morning, according to the latest figure from the Department of Health and Social Care. Following intensive review, the British government has stepped up measures to fight COVID-19. British Prime Minister Boris Johnson on Monday called on people to stop non-essential contact with others and to stop all unnecessary travel. (Photo by Ray Tang/Xinhua)