In West Sussex young couple Becky and Joe plan to build their first home together: a tiny house on an old trailer, enabling them to live debt-free.

In this episode, George meets Mark - a vintage car nut from Coventry. With the help of his petrolhead daughters, Mark plans to build a super-cool camping trailer from an old Saab so they can travel to Le Mans in style. George is also back on home turf in the North East, where inspirational teacher Busola plans to create a cutting-edge mobile classroom out of a double-decker bus. George's Spanish design odyssey continues as he visits an incredible hundred-year-old farmhouse on the coast of Asturias, which has been given an extraordinary 21st-century facelift. And back at the big build, the team at Studio Hardie are hard at work designing a lightweight, flexible and multi-functional wall system for the campervan living pod, while Stu and George give the ancient Ford Transit chassis a slick, retro makeover.