As he announced the next step of measures, these were the scenes in Blackpool on a bitterly cold Easter Monday
But he said the difficulties facing countries in Europe illustrated the risks still posed by the pandemic.
Mr Johnson said: “We can’t be complacent. We can see the waves of sickness affecting other countries and we have seen how this story goes.
“We still don’t know how strong the vaccine shield will be when cases begin to rise, as I’m afraid that they will, and that’s why we are saying please get your vaccine – or your second dose – when your turn comes.”
He also encouraged people to use free NHS tests as part of the drive to identify cases without symptoms.