George meets farmers Ali and Rich, who hope to salvage one of the rarest and - for its time - one of the most expensive caravans in the world: a 1950s Warwick Knight, complete with spiral staircase and roof garden. In Devon, fireman Nick wants to build a garden studio apartment for his mother-in-law out of an old dog house. George's New Zealand visit continues with a trip to a fold-out beach hut. And Will and George discover that an electric wheelchair could provide the engineering breakthrough they need to rotate their futuristic home.

In Lincolnshire, a couple are adding a dance floor to a rare campervan, while a small Stirlingshire business converts a Sea King helicopter into luxury overnight accommodation.