britain today, queen elizabeth ii delivered a rare public address on the coronavirus. as elizabeth palmer reports, it drew on her own wartime experience. >> reporter: boris johnson appeared in the doorway of 10 downeyeet on thursday to applaud health workers. he has been in isolation, but insisted is he was still leading the fight against the virus. tonight, we're told he's in hospital having tests as a precautionary step. the announcement came just after queen elizabeth made a rare address to the nation. >> i hope in the years to come, everyone will be able to take pride in how they responded to this challenge. and those who come after us will say, the britons of this generation were as strong as any. >> reporter: most britons are trying to keep the regulation two yards apart outdoors this beautiful spring weekend. those who aren't, get nudged along by patrolling police, whether in london's busy parks or on english channel beaches. meanwhile, sweden is still bucking a national lockdown. shops, restaurants and schools remain open, though older people are self-isolating. but critics say the data suggests sweden will soon follow italy and spain deep into crisis. in perugia, italy, father romano celeb