You want to allow sales of council homes, one of only two ways to turn spending into investment?
The only other way is making a profit on rentals, but I would argue rentals should be break even plus a little put aside for improvements and repair, but no more.
Low rental costs would be really nasty hit on greedy landlords and their ever rising rents as easy availability of cheap rents would kill their ability to keep their own prices high.
I would not allow Thatcher style selling off for any reason, and only break even rents, thus that's spending, not investment.