ONS vaccination data: https://www.ons.gov.uk/peoplepopulati…
In the UK by the end of August 2022, of those aged 12 years and over: 93.6% had received a first dose of a COVID-19 vaccine, 88.2% had received a second dose, 70.2% had received three or more doses.
Therefore 6.4% of over 12s are totally unvaccinated.