I think it means 88.4% of the UK population have had one dose, and 71.4% have had 2 doses.
although I don't think 37,782,252 people is 71% of the UK population is it? The 46,733,115 figure is about right for 71%.
figures eh, I'm only good with the hourglass ones, and it looks like someone screwed up and mixed theirs too