According to OECD data, the UK's share of health expenditure and it's per capita healthcare spending is significantly lower than that of the U.S.
Data from the OECD states that U.K.’s health care spending per capita was $3247.2 in 2017, $3336.5 in 2018, and $3536.5 in 2019. The United States’ per capita healthcare spending was $8620, $9008.8, and $9386.5 in 2017, 2018, and 2019 respectively. The per capita spending figures include out-of-pocket spending, private spending, and public spending as well. The report also highlighted that from 1980-2018, the U.S. had the highest healthcare spending among the OCED member countries based on the percentage of the GDP.
Note- It is not clear if the figures mentioned in the report are in million or billion.