With one in five households now renting and home ownership becoming just a dream for many, Jonathan Maitland investigates Britain's housing crisis. From Peterborough, where over 70 residents were made homeless to make room for other homeless people, to Manchester, where 15,000 new homes are being built without a single one being affordable, and Cornwall, where a family has spent 10 years waiting for a council property while their four children are forced to share a room.