You're absolutely correct that it's not solely an issue of landlords buying up property that's causing the shortage. I was just providing a possible legislative method to cut down on the number of properties being owned by speculators and corporate landlords.

There simply isn't enough housing being built for the population growth we've been seeing. That's 100% going to lead to an increase in prices.

In cities outside of London though there isn't always that same pressure (i.e. Liverpool still has a housing surplus), so why are housing costs rising past the point where people can afford to buy them? Supply and demand should mean that prices remain affordable for most people but they aren't.

A large number of rental properties are rented by investors of one form or another, if we can cut down on homes as speculative assets we should see more homes being sold to homeowners and prices fall back to more manageable levels for everyday people.

There are loads of other problems such as the UK building houses instead of things like apartments, planning permission bs, NIMBYism, economic activity being focused in the south, homeowners not wanting their valuations to go down, etc etc which are all part of the puzzle. Ensuring that more homes are owned by residents rather than investors can only be a good thing though imo.