I think by the time I am on a pension, they will be scrapped (because the benefit scroungers will have used it all up!) so instead of paying any money into a government pension I would rather pay into a trust or just an offshore bank account where it can't be touched by the UK.
You might want to read this (it's a couple of years old but still applies)
http://www.bbc.co.uk/news/uk-england-16744819
A large part of income tax that working people pay goes straight back out again to pay for the pensions of retired people. It doesn't go into a pot, put away for decades to be used for pensions.
When you are at retirement age, the younger people still working and paying income tax will be paying your pension.
There is no "pot" of pension money that gets "used up". You think the government would be able to have millions of pounds just sat there in the bank for decades, earning practically nothing?
It's basically the same as getting paid every month - money comes in, then it all goes out again on mortgage/bills/food/car etc. Only it's: tax revenue comes in, then it goes out again to pay for pensions, benefits, debts, NHS, education, defense etc.
And lets not forget the "benefit scroungers" - there's more to benefits than just JSA - have a look at the breakdown of benefits paid by your income tax. A tiny amount goes to JSA claimants, the rest is housing benefit, council tax benefit, child benefit, disability living allowance, income support... the list goes on. Combined with the pension bill (which is another form of government benefit) and all other benefits, JSA is 3% of the total benefits spend.
The reason why the state pension is getting less and less, is because people are living longer, therefore there are more people over retirement age, which means the pension bill is getting bigger.