It was good news to me (and the tenant) ! I bought one. The tenant was father to a large family, had been there many years, and bought the house from the Council (Hammersmith and Fulham) very cheaply. It was enormous and in a tree-lined avenue near Olympia.He had no need of a place that size, rattling around in it on his own, his family having grown up and he being widowed. I think I paid £300,000 for it, as a family home. It only had one bathroom, though it was on 5 floors and had about 8 bedrooms, so it cost a fair bit to refurbish but it eventually returned a fair profit, tax free.
What escapes me is why, long ago, the Council couldn't have moved him out to somewhere smaller and then sold the house on the open market. But the policy was certainly popular and it did result in a lot of tenants buying and then upgrading their houses. I think Scotland may find that they are too late and there are few takers left.