Labour have rebranded greenfield grey belt already, so the brownfield sites arent the only option. There is a load of land round here going through the rebranding, which seems not to be the type of land they suggested it would be, but it is happening nontheless. This will give more housing in the countryside.
We cant give it away without real limits imo. There are plenty of houses for sale nobody is buying in the countryside. Apparently the roads and trains are knackered. And there are no schools, doctors, etc.
I rented for years when I was young, in a horrible area. Horrible flat. Got a tiny house, in a crap area and went from there. Now I live in, and can afford, a nice place in a nice area. I have folk work for me, in their 20s, want to go to the 3 bed semi at first buy. I was at an event for work this week and someone was sharing research about the expectations of younger folk now. It is far higher than I had. Now I am not tarring all younger folk the same, or all who are trying to buy a house in the countryside. But you cant always have what you want, unfortunately. For a long time I aspired for things I now have, some I dont and probablt wont ever. I would love to live in a world where everyone could live their dreams, but that isnt realistic.