There is a possible geographic and social (not geo-political) explanation of what's going on here. The UK is in a similar situation to the high population area in the Canadian Province of British Columbia, the area bounded roughly by Victoria, Nanaimo and the Greater Vancouver area. Seasonal changes in climate occur at roughly the same time, and the intensity of the seasonal climates are about the same - and the same type. Also population density in that area is fairly comparable with the UK. Outside of the area, the population density in B.C. plummets and you get into an area of very high mountain range, so the comparison kind of falls apart eventually - but vaccination rates are also very similar.
If I make a comparison between the COVID-19 infection charts for both BC and the UK, they are not exactly the same, but very similar. This looks climate and social (i.e. lifestyle) driven, not vaccine driven. Keep in mind that vaccination now has almost no effect on the infections, but does in the hospitalizations and deaths - which I don't have data on for B.C. I would have included the US States of Washington and Oregon which are not in a different geographical zone, but the climate changes rather rapidly as you get closer to California. Their charts (Washington and Oregon) also look similar, but the spikes are quite a bit higher than either B.C. or the UK.
... just sort of related...
To me, the most interesting thing I found is that the areas directly east of the mainland mountain ranges is also the demarcation line of the high infection rates in North America - but Europe itself does not really have a comparable zone. For that you really need to go east of the Ural mountains - which is in Asia and the Indian sub-continent. I have almost no trust in the data being reported from most of that region except India. What I can say is that Eastern Europe seems to be a lot like the extreme eastern part of the Prairie provinces and Great Planes areas - so kind of flipped back to front so to speak. But it's the extreme western part of both Europe and North America and the similarity of the charts that drew my attention.
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