The striking, and frankly pretty incomprehensible fact is that presently you can arrive in a UK airport on a Middle Eastern carrier having hubbed there from heaven knows where. Even though you might not have originated from a country that is heavily infected with Covid 19 you will in all probability have shared the flight from (Doha) with other people who have originated from more risky points, and consumed the recirculated air for 6 hours, and been well within 2m of other passengers.
That really doesn't sound like a very good way of containing, or preventing further spread of the virus, and the longer this lax situation persists, the longer it will be before international commercial aviation begins it's slow trek back to something like normality. Personally if I were the UK government I wouldn't be going out of the way to repatriate people who have found themselves stranded without a route home, since most of them by now would have exited the UK at a time when the virus was already spreading, and to be honest, the writing was on the wall. It won't be long before Brits (and others) living on the Costas of Spain are bleating about wanting to be repatriated to UK, and why won't HMG do anything for them.
One advantage the UK has over many other nations is that it is (geographically) an island, and as such should have been able to do more, sooner, to protect itself. Sadly it didn't, and so we find ourselves on a similar trajectory to many other nations, both inside and outside Europe.