Surely the do not actually pay anything, it is all black hole made up rubbish, with no actual fund except future taxpayers, which means the scehems that pay for themselves end up in the same brackets as those which do not, and everyone gets hurt.
My nhs contributions are now at 16.5%, on a career average pension, which is now split into an annual packet pension with retirement for me at 67. There is no employer contribution, even if they claim there is, as there is no fund, or investment, which is half the problem with this country's public pension system.