In this episode, inventor Rick Hunt plans a futuristic, wheelchair-friendly home for his family in a double decker bus - all for just £20,000. Sarah meets the family who traded London life for a beautiful debt-free home amid 35 acres of Welsh countryside. There's a stunning mortgage-free eco-home in Shropshire and a salvaged caravan made into a home for just £3500. And in Fife, a single mother explains how her drive for mortgage-free security has taken her from living on benefits to owning her home outright in just 10 years.