The UK will mourn becoming a vassel state of the US following it's ill-conceived and hastily signed trade agreement with the US (the uSUKitup pact) and despite calls for a vote to USxit will agree to just become a state of the US because it will be quicker and give them representation in the US parliamentary "system". The government will point out that with a Charles on the throne there is legitimate precedent to seek a change in the status of the monarchy anyway. Yes, they argue, the people could rise-up in a civil war but they are too feckless and stupid to do so - and good luck without any meaningful armaments! The past 15 years have shown they can't think for themselves and just do what Cambridge Analytica manipulate them to do, which was made even easier after all the sheeple downloaded that covid app that did nothing meaningful to curtail the death rate, but helped the government gather massive amounts of personal data to learn more about to manipulate the masses.
Petrol cars are still on the road, and there are regular electric brown-outs with France and China jacking up the electric price, and Russia turning off the gas taps.
Pen and paper is back in schools as a result and people are increasingly being priced out of MS' new pay-per-day fee structure for windows and office software.
Policing has disintegrated to corrupt African standards with the rich bribing officials and common folk having no-hope. The NHS is sold off and everyone has US style insurance policies refusing to pay-out and a growing underclass is becoming malnourished, exploited and increasingly unruly.
Some cities have become no-go areas. Organised crime is rife, both foreign-run and home-grown. Certain counties are trying to push for independence to implement Sharia rule to push back against this.
No-one has a pot to pee in. English beach resorts are booming as it's all people can afford to do for a holiday, what with the carbon tax on airplanes and European tourist toll exceeding the average monthly wage. Central London has achieved its dream of becoming Singapore and is owned by rich Asians, Russians and Arabs. A border has been created around the edge of Zone 2 and no-one without a 6-figure bank account can enter other than to service the wealthy living there. The average building height within this border is 20 storeys, with remaining low-rise pockets being compulsarily purchased for redevelopment.
HS2 still only reaches Manchester, no northern branch lines have been built
Gibraltar is now Spanish and The Falklands have gone to Argentina with the British forces unable to prevent it due to fuel shortages and lack of resources.
Hadrians' wall has been rebuilt by the Scottish to keep the English out following their successful reintegration into the EU and the increased living standards north of the border. This came at a high price with the EU imposing migrant quotas in exchange based on population density. Scotland is now much more densly occupied and migrant numbers are passing 1:1 to native Scottish. Spain and Portugal have access to Scottish reservoirs to try to combat the increasing droughts, with a pipe line has been built via Ireland and Brest.
Northern Ireland has been sold to Ireland under US pressure and with the decline in food and living standards post the USUK trade agreement the people there welcomed it.
Mandarin is increasingly being taught in all schools worldwide and the Chinese OS is beginning to outstrip windows in all major retail markets.
England still haven't won a football tournament
Scotland still haven't qualified for a football tournament.
Venice is underwater
The ice caps are now at 15% of their 1990 area.
Greta Thunberg is still in prison in Moscow along with Pussy Riot and a number of Oligarch ex-pats extradited from London at the Kremlin's requests.