Guardian columnist Dawn Foster challenges us with the realities of the UKs housing crisis. What does affordable housing mean in practice? Why do successive governments fall short of building the new houses they promise to? Why is the cost of owning a home way beyond the majority of first-time buyers? And why are the poor increasingly warehoused in the very poorest of housing stock? How come putting a roof over our heads has become such a vexed issue?Dawn Foster is a columnist at The Guardian newspaper, and also contributes to the New York Times, London Review of Books, and Prospect magazine. She is a regular commentator on the BBC and Sky News.