We have a housing crisis, especially in affordable social housing, so they are going to offer tenants the right to purchase it for up to 70% discount 
It seems like every day brings new nonsense.
I quite liked about 80% of what the Tories have done, until this week. It seems such a desperate attempt to buy "working-class" votes.
Election 2015: David Cameron to pledge right-to-buy extension - www.bbc.co.uk/news/election-2015-32295970