People are told to stay at home, despite expected good weather, in honour of two nurses who died.
The government has pledged to increase daily testing tenfold by the end of the month.
It comes as the Queen will address the nation on Sunday, as the number of deaths rises to 3,602.
The health secretary has promised 100,000 tests a day but there are questions about how it will be achieved.
After being told her husband was dying from Covid-19, Sandra Wilson heard the doctor crying down the phone.
The mother-of-three died at Walsall Manor Hospital, while a second nurse has also died in Kent.
Medics are told they will need to decide who gets the most critical care as coronavirus spreads
Families and politicians are calling on Hospedia to cut their charges during the coronavirus crisis.
A second "Clap for Carers" tribute saw the country salute NHS staff and other key workers dealing with the coronavirus pandemic.
Experts are set to assess the value of face masks in helping slow the spread of coronavirus.