Vaccine coverage and denominators

What proportion of people had the Covid-19 vaccine?

What share of people have had a Covid-19 vaccine dose? For the United Kingdom on 25th May, different sources give different statistics:

• Public Health England: 72.9% (of the adult population)
• Our World in Data: 56.5% (of the total population)

There is a conceptual difference. PHE uses an Office for National Statistics estimate of the UK population aged 18 or over (~52.6m). Our World in Data uses the UN World…