Won't this just create urban sprawl?

England has massively underbuilt on its land compared to every other European nation. We're in a housing crisis where even the richest 10% of Londoners can't afford a home. The affordability crisis is bad in every major English conurbation. We need new cities. But we can also build with gentle density, in a way that creates new places and communities, not just boxy homes on the edge of towns.