UK Prime Minister Boris Johnson sent a video message from isolation and emphasized: "I'm in good health and have no symptoms".

"Hi folks", Johnson wrote, "I’ve been instructed by our NHS Test & Trace scheme to self-isolate for two weeks, after being in contact with someone with Covid-19".

"I’m in good health and have no symptoms", he added, "and will continue to lead on our response to the virus & our plans to build back better"