Take from https://www.gov.uk/guidance/coronavirus-covid-19-advice-for-uk-visa-applicants-and-temporary-uk-residents?utm_source=08e4456d-ca66-4b50-9c99-fa1b63fcbb63&utm_medium=email&utm_campaign=govuk-notifications&utm_content=immediate on 15 April 2020.
UKVI webpage: Coronavirus (COVID-19): advice for UK visa applicants and temporary UK residents (14 April 2020)
Home Office Documents