I understand the point you are making with the chart you are showing but once again it is skewed due to population density.
Portugal for instance has a population of around 10 million, 1 million of which have not been vaccinated. Far less people to get jabbed compared to the 65 million in the UK and NI. The population density of Portugal is only 110 people per sq. kilometre as opposed to the UK at 280. It would be fairer to compare Germany, who have a slightly less population density, but higher overall population to the UK at 240/sq.km. and show a similar percentage vaccinated.
In my opinion we are comparable to any country in the world with a similar sized population and population density and the comparisons being made are unfairly biased by not making direct comparisons to similar sized and populated countries.
I think by comparing a country with a population of 10 million to a country of 65 million the country with the smaller population will always have the edge.
I also think the figures you are using are incorrect as the official UK figures show that 89.6% have received their first dose, 81.9% have been double dosed and 52% have received their booster a total of 128.5 million doses administered.
Portugal by comparison have administered 18.8 million doses. (
COVID-19 Vaccination Tracker: Daily Rates, Statistics & Updates (pharmaceutical-technology.com)
If you use the official figures against the chart you have posted the UK is significantly higher.