In reply to Papillon:
> There are plenty of private pension schemes which are relying on current contributions to pay
> current pensions.... mine for a start!
Yes, some schemes are technically in deficit, by accounting rules, but the principle of a funded scheme is that they have assets sufficient to cover all future obligations. (Further contributions then add to the pot and generate further obligations, but aren't there to fund current payouts.)
> Nobody's been conned ...
Well good, if you're accepting that everyone knew it was a system of "you pay for current pensioners, in return for an IOU from future taxpayers, who will provide for you", then great, no-one was conned. Just so long as those past contributors understand that it was a deal in which the "future taxpayers" had no say, and thus shouldn't be regarded as binding on them.
> Are you also denying that the NIF has been invested in government gilts?
As I said, the NIF is an accounting device. There is no "fund" of all the contributions. What they do do is add up the inputs and outputs of the scheme each year. If there is a "deficit" then the government tops it up, if there is a "surplus" then that money is "lent" to the government. But that only concerns a very small portion of the money, namely the small gap between inputs and outputs, which is small because the scheme has always been designed to be in rough balance on current inputs and outputs.
E.g. "The Fund is used exclusively to pay for contributory benefits, and operates on a ‘pay as you go’ basis: broadly speaking, this year’s contributions pay for this year’s benefits." -- from www.parliament.uk/briefing-papers/sn04517.pdf
E.g. Government Actuary: "The National Insurance Scheme is financed on a pay-as-you-go basis with contribution rates set at a level broadly necessary to meet the expected benefits expenditure in that year, after taking into account any other payments and receipts, and to maintain a working balance."
[In complete contrast to a funded scheme which would have a massive excess of inputs over outputs in its early years, when no-one had built up much pension entitlement -- hence the building up of a large investment pot.]