Maybe there is, for a number of years but my suggestion will keep the housing stock available in the future to the LA when the purchaser moves on or dies. No different in practice to shared ownership. What happens then when the tenant moves on or dies?There is already a restriction on profiteering, from the resale. It has to remain in the owner's possession, for a number of years, after purchase. Otherwise, an amount has to be paid back to the council, from the sale.