To me this sounds like more policy without thinking through consequences. I read an article today about a lady with 4 children being made homeless when her btl LL sold the property and local council had no housing stock to re-home her. Instead she had to spend months in temporary accomodation which was 2 rooms and 2 of her teenage children lived with their Nan. If the btl sector is squeezed any more surely most btl LL will simply sell up and then even less rental houses stock.