You shouldn't be - they've got no means with which to manage it, except lockdown.
Well, and those extremely successful vaccines that are showing no sign of actually not being effective against every variant so far.
Which is actually what is managing the situation right now.
Based on our cases, we should be seeing probably 10x the amount of daily deaths, at least.
We aren't, and while there's a long way to go, it's clear that's because of the vaccines. I don't see why you bang on with this certainty that COVID is going to mutate unlike any other virus ever and suddenly be totally immune to the vaccines, especially when you consider the amount of immunity already built up previously from people having it in the first place, and the boosters which are in development.
Should we plan for worst case if needed? Absolutely and I share your opinion that this government probably won't have anything in place and that's shocking.
But, in the meantime, that changes nothing because as a society - not just the UK - we have to take the steps out of it and see where we're at. Vaccination has been the way out of this all along, it is for every country, because no country in the world is currently back to normality - international travel is still ridiculously difficult and that affects everywhere.