It was mentioned in the Budget, a package of measures to help local councils.
https://www.gov.uk/guidance/coronavirus-covid-19-guidance-for-local-government
I’ve seen a recent tweet which says the military will be called upon to help, such as the medics, transport for oxygen etc and helping the prison service, and border force.
That’s a long way from lockdown and martial law that the gossip mongers are spreading rumours about.