Experts have expressed doubt over Boris Johnson's hope for regular mass coronavirus testing of the population as a route back to a more normal life.

The Prime Minister said the government is "working hard" to increase daily COVID-19 testing capacity to 500,000 by the end of next month.

But he said the long-term ambition was for millions of coronavirus tests to be processed every day, with some results potentially being turned around in as little as 20 minutes. He characterised it as the "Moonshot approach".

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