I have experience with shared ownership and a housing association.
Its a great concept and one that has a lot of potential. HOWEVER that potential is being massively ignored and not fully exploited. It worked for us but there are a lot of flaws - some schemes are better than others, its poorly regulated to protect home owners, they are complicated and no one knows much about them including mortgage lenders.
And oh my God dealing with our housing association! I think describing them as a chocolate teapot would be kind. We were initially told that our property was valued at £50k less than it was 4 years previously for starters (it wasn't) and the icing on the cake was when they tried to charge us rent on the property AFTER we had bought them out. I don't know a single person who has had a better experience with them.
So I'm inclined to say, that expanding the power of housing associations isn't a good move until you actually start tackling the existing problems with them, and since expanding social housing is being particularly shared ownership this is very important. Until you start making sure its properly regulated and far, far more transparent, you'll just be saving up on another ticking timebomb.
I'd consider us to have an understanding of economics and finance to be way above average. We bought our house anticipating the crash in 2008 (though if you listen to Mr Brown, no one was able to do this though. I find him pretty contemptible for that level of incompetant) and we both feel that we were caught out by certain aspects of shared ownership. So how someone who got less than a C at GCSE maths is supposed to understand stuff like this, I have no idea.
Which brings me back to a really important point. How many of you were taught budgeting and money management at school? And how many people on benefits tend to be more likely to have struggled with maths in the first place? And the solution to the problem being proposed is to once again penalise them for this, make the system more complex, restrictive and difficult when perhaps its the system thats failed them in the first place.