We're moving a bit off topic here but just a comment on your comment.
In Canada, we pay Canada Pension Plan (CPP) which, I believe, is similar to the UK NI... provision of a pension in retirement. Employment Insurance (EI) is paid separately; itnused to be called Unemployment Insurance but that was massaged a few years ago. There is no separate National Health payment or contribution; health care is funded through income tax as is Old Age Security (OAS) pension.
Obviously, this is a MUCH reduced explanation of how it works.