I believe the changes to expenses re withdrawal of payment of mortgage interest is one of the factors that has led to more MPs becoming landlords. So an MP under the old rules bought a flat and had his /her mortgage interest paid. That stopped so same MP rented a flat, had rent paid, and rented out the flat he owned ( sometimes to another MP) and used that rent to fund mortgage. For me, the real issue was that they got help with the mortgage interest but got to keep the increase in value of the flat/house ( minus any capital gains tax if they hadn't flipped but flipping's another story). I think this is one issue - and different from an MP who has a portfolio of rental properties. I don't understand why it matters whether a property is ex- council house or ex- housing association. If it's on the market and bought legitimately, why is that different from buying a house that was always a privately owned house? I think that's a different issue from buying the council house or housing association house that you actually live in at the point of sale. Not necessarily better or worse but different issues arise. My niece bought a lovely ex housing association house - the woman she bought it from had bought it under right to buy from the housing association - the real pity was that it was able to be sold in the first place in an area of real rental housing shortage at affordable rents.