As the national spotlight falls on the need for Britain to build more high-quality affordable homes, a Dispatches investigation asks why so few affordable properties are being built at a time when housebuilders have been making record profits. Reporter Antony Barnett travels across the country revealing how property companies have failed to deliver new affordable homes and asks questions about the links between the government and the property industry. Airing in a week of programmes on Channel 4 and More4 exploring issues of housing and homelessness.