Boris Johnson has warned the NHS could be “overwhelmed” if people do not act to slow the “accelerating” spread of coronavirus, as he urged the UK not to visit loved ones on Mother’s Day.

The PM called on the public to join a “heroic and collective national effort” and follow social distancing advice.

The number of people who have died in the UK with coronavirus rose to 233 on Saturday, as cases topped 5,000.

It comes as NHS England plans to write to 1.5 million people most at risk.