How does the rest of the world go about the UK clean up operation?

What are your plans for cleaning up and retaking the UK? The current quarantine is a temporary measure at best. Third parties MUST work on a cure and vaccine in case it get's out. But I doubt there is any hope for the current inhabitants.

So in xx years later - how are you cleaning up and retaking the UK? Or maybe you use it for some other purpose. But you can't just let it sit there.