Britain has imposed a stringent lockdown on the English city of Leicester following a local flare-up of the novel coronavirus just as Prime Minister Boris Johnson attempts to nudge the United Kingdom back to normality.

The United Kingdom has been one of the world's worst-hit areas, with more than 54,000 suspected deaths, though infections have been waning in recent weeks and Johnson is rolling back nationwide restrictions to revive the economy.

However, in Leicester, in the eastern Midlands of England, the seven-day infection rate was 135 cases per 100,000 people, three times higher than the next highest city.