As I have said repeatedly, the NHS scheme takes in billions more in contributions than it pays out in pensions, which renders the "unaffordability" argument somewhat redundant.
And another thing: every time I pay for goods or services I contribute to the pay of someone or other in the private sector, and from my taxes in the increasing number of public sector contracts awarded to private companies, and thus, by extension, private sector pensions.
And when the private sector pension schemes were being screwed over (after employers had been allowed to take huge pension contribution holidays - where did that money go? I didn't notice prices for goods and services falling!) what prevented private sector workers taking the same sort of collective action that public sector are now under similar circumstances?