My Lords, I pay tribute again to those at KCL who developed the symptom-tracking app. The information from it has been enormously helpful over the last few months. In many ways we have benefited from the app’s independence as a source of important front-line intelligence. I am aware of the letter written to the Prime Minister, and I hope very much that we will be able to work more closely together. The information on asymptomatic references is very important. However, I stress that the ONS study suggests that, unfortunately, many people who declare the symptoms of coronavirus are mis-self-diagnosing, and we have to bear that factor in mind.