I won't buy this kind of private pension.

If I do, I will lost contral my own money.I am not allowed to touch it until having reached a certian age.And there are still some risks, which you won't guarantee to get your money back. For example, you die just after drawing the pension.I reckon that you may buy it if you are sure you can live beyond 80 and you are a 40 % tax payer.