@Tootletum, my apologies for having misreading that you did not claim to be an epidemiologist.
Neither am I. Nor am I a genius. I am just reasonably good at basic secondary school maths, including exponential growth arithmetic.
That's really all it took in order to work out from the reported case numbers, the growth rates seen in other countries without aggressive containment measures, the known lag of about two weeks between infection and case confirmation in the UK, that there were likely many thousands of infected persons in the UK. I guessed roughly 30k. Today the UK government stated estimates that there are probably 5k to 10k. I really hope that they are right, but the key point is that even if they are, unless we take significant action right now to slow down those growth rates, we will get to those 30k actual infected persons in the UK within a week or ten days, and then it will keep growing further at very high rates unless we go into "lockdown."
So far, all but one of the big slowdowns in case count happened in countries where they used "lockdown" in certain areas, or nationwide. The exception, S. Korea, used aggressive testing with deployment of technology to help find, isolate and treat infected people (S.Korea).
We don't have the testing nor the technology capabilities of S.Korea, so lockdown is our only real option if we want to slow down actual case growth in the UK.
In most other places, where the political will or ability to take really effective containment measures has been lacking, we have just seen continued rapid growth in the number of cases, followed closely by a rapidly increasing number of deaths, until the death count gets so high that the population is willing to accept a proper lockdown.
Is that what we want to do in the UK?