I don't know. I don't know what % of social tenants live in 'affordable homes' but I assume it is still a small % as the category (with rents set at 80% of local market rents) was only begun after 2008.
I'm also 3 years out of the loop (early retired) and haven't kept track of the changing numbers.
However, this article from late 2015 gives a fair indication across all social housing in England and Wales:
https://www.theguardian.com/housing-...-england-wales
41% of social renters (council and housing association homes mainly) are in work.
28% of social renters are over 65 and on state pensions.
However, about 80% (3,3m out of 4.1m) of social renters get some housing benefit - so housing benefit (like many other welfare benefits) is supporting workers on low pay. It is even starker in parts of the private rented sector where the benefits system is subsidising landlords.