For me it is the unfairness of it, knowing some women receive a better pension when they have not worked.
I couldn't agree more. A friend of mine didn't work, and gets a full pension because she paid voluntary contributions in the years she wasn't covered by the state subsidy for looking after her own house and children (even when they were out all day at school). VCs are about £800 a year (and obviously were cheaper in previous years) as opposed to the thousands paid by working people, who are also paying childcare fees and believe it or not look after their own houses and families as well as working. Naturally, not working meant she wasn't opted out, so stopped paying ages ago when she reached the right number of years, when many people have to make up the opted out years to get the same amount as well as their occupational pension.
Even more annoyingly, if the SP does become means tested, the fact that she doesn't have an occupational pension will mean that she will probably still qualify, when working people who have paid into one could lose out. Pensions are supposed to allow people to leave work and have enough to live on after years of contributing to society. How you 'retire' when you've never worked is beyond me. It's very unfair.