The Channel is closed, as are all destination airports that would otherwise be receiving inbound flights from the UK. All flights inbound to the UK cease, from all originating countries, with no exceptions. Internet links to the UK are turned off, as everyone has heard enough bumbling, incoherent entitlement. The rest of the world gets on with recovering from the pandemic.
No-one else anywhere in the populated world gives a flying toss about the UK, and just carrys on as if we did not exist. The EU prospers, America ignores us, the Commonwealth shakes its head in disbelief and shrugs.
Back ‘ome, riots break out, HM Govt. opens ‘isolation camps’ dotted around the country, ringed with razor wire and a few desultory squadies who have to do what they are told. The camps are filled with ‘infection risks’ (Trade Unionists, Do-Gooders, Lefty Lawyers; that sort of scum).
Early in 2022, a drone crosses from France taking low-level high-res photos of the streets and fields to see if anyone is still alive over here…