You also have to look at effective tax rate. One measure of this is total revenue / GDP, which you can see some different measures of in Wikipedia.
UK taxes 34-39% of GDP, US taxes 24-29% of GDP. So the fact that UK spends a smaller part of their total revenue doesn’t mean they are more efficient in public health spending, since their tax revenues are quite a bit higher.
You also have to look at effective tax rate. One measure of this is total revenue / GDP, which you can see some different measures of in Wikipedia.
UK taxes 34-39% of GDP, US taxes 24-29% of GDP. So the fact that UK spends a smaller part of their total revenue doesn’t mean they are more efficient in public health spending, since their tax revenues are quite a bit higher.