Prime Minister Boris Johnson says the action is needed to protect against the risk of new Covid strains.
Five things you need to know about the coronavirus pandemic this Friday evening.
The R number in the UK is officially estimated at 1.2-1.3 as a further 1,280 deaths are reported.
First Minister Mark Drakeford says there is "no doubt at all" Covid-19 is spreading in shops.
Plastic surgeons express shock at the stabbing of "highly respected" Graeme Parks in his home.
Replacement exam grades are likely to arrive earlier and be decided by teachers and a test.
Some areas could see freezing temperatures and 5-10cm of snow on Saturday, the Met Office says.
Donations of plasma from people who have recovered from the virus have been suspended.
Seriously ill patients are moved almost 300 miles to ease pressure in over-stretched hospitals.
David Chambers is accused of charging the woman £160 for a bogus jab.