The UK government's under mounting pressure to test more people - particularly healthworkers - for Covid-19.
It admits it needs to go 'further, faster' on testing but says it is having trouble sourcing enough chemicals and equipment to ramp up numbers.
It's thought as many as a quarter of UK doctors are in self-isolation, but many of those could return to work if they could be tested and were found to be negative.
Dr Osman Dar from the Global Health Programme at Chatham House says it's become harder to source what the government needs.
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