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Covid-19: Critical Care Capacity

My Lords, can the Minister be a bit more specific on the diagnostic front? The deal with the private sector is incredibly welcome, and the situation with Northwick Park demonstrates how important it is. However, it is not just about beds and ventilators but people. We know that staff are having to self-isolate because someone at home seems to be ill but they themselves may not be. What kind of numbers are we talking about? The Prime Minister has talked about getting up to 25,000 a day; there are 65 million people in the country. What is the ambition, not just in four weeks but in eight and 12 weeks, of what we might get to and how we will get there?