"Hands, face space and if you have symptoms, get a test", were the simple instructions that only last week the Health Secretary, Matt Hancock, told Parliament we should all follow.
What he forgot to say was that there isn't actually enough capacity in our laboratories to process the number of tests needed to meet demand right now. So while his message is (for once) very clear, for many of my constituents, and others up and down the country, it is proving impossible to follow.