The UK government says it has a plan to ramp up coronavirus testing - especially for frontline health workers.
It's facing growing criticism for its lack of testing so far, compared to some other countries.
And it's been missing its own targets for daily tests.
Thousands of NHS staff are currently in self-isolation, but could return to work if they tested negative for Covid19.
Former UK health minister David Mellor says it's not good enough.
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