NHS has access to some NI funding too about 20% of the NHS budget today comes from national insurance but oddly enough often in the forms of “loans”

https://www.kingsfund.org.uk/projects/nhs-in-a-nutshell/how-...

National Insurance is also de facto a payroll tax in the UK and a pretty steep one at that it will be over 15% come April if the NIC increases are implemented as is.