Littlebear
there are millions of people who are self employed or on low hours jobs with no state pension and no private pension and no employer to make a contribution
auto enrollment allows low earners to opt out : they will as any deduction from their pittance wages is too much
and even if they opt in, 3% plus 8% of £6000 a year for 5 years does not add up to much of an annuity.
Annuity rates are such that you need to be retired for 38 years just to get your money back
and if you are on NMW why on earth would you want to risk part of it to the stock market?