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It is appropriate for most people of an 'average' risk profile to contract back to S2P (State 2nd Pension) as the growth rate after charges on a PP required to 'beat' S2P benefits is quite high
The difference is, if you 'contract in', you have to hope that future governments will actually pay up when you retire, whereas if you 'contract out' you have to hope that the economy will continue to grow at a decent rate and the stock market will grow with it.
IMHO, anyone who expects to retire on a state pension after about 2020 is likely to end up living in a cardboard box and eating dog food, if they're lucky. Anyone who expects to retire on a private pension by then _might_ have a chance of not having to live on dog food. The whole idea that you can have a sizeable portion of the population retired and living well off the backs of the rest is unlikely to work in the real world.
Probably the best bet would be to have lots of kids and hope you can scrounge off them when you're old and grey... assuming they're not paying 80% tax rates to keep state pensions flowing.