Addressing SNP health spokesmand Martyn Day, Mr Hancock said: “There were in the spring some people who complained about my determination to expand testing capacities at a record pace.
“We’re hearing some of those voices this morning out again and complaining that we want to increase testing.
“Both the SNP and the Labour Party opposite are making a huge mistake in opposing mass testing.
“It’s an incredibly important tool in our arsenal.”
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Mr Day had earlier questioned Mr Hancock on the viability of Operation Moonshot after representatives from the British Medical Associaition cast doubts on the plan’s deliverability.
The SNP MP for Linlithgow and East Falkirk said: “We heard the Prime Minister describe his Operation Moonshot as the ‘only hope’ of avoiding a second national lockdown.
“Already some experts have described this mass testing strategy as being fundamentally flawed.
“Does the Secretary of State think the Prime Minister is gambling on something that the experts feel cannot be delivered?”
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