It's the sixth of nine heats and three new designers battle it out for a place in the second round and the chance to win The Great Interior Design Challenge. This time our amateurs are updating three identical living rooms in the handsome town of Welwyn Garden City. But with only three days, £1000 and the help of a builder, the pressure's on to deliver rooms that keep the homeowners happy and impress the judges. Costume designer Christine from Belfast has a natural approach in her room – using turmeric and onion skins to dye her fabrics, but it's a time consuming task. Photographer Luke has a job convincing his clients to go with his vibrant retro scheme, while Rich from Somerset must work hard to deliver his art-deco scheme to his art-deco purist client. Architectural Historian Tom Dyckhoff delves into the history of the Garden City and its fine neo-Georgian architecture. While judges Sophie and Daniel must decide whose design is worthy of these iconic homes and a place in the next round.