In the last of the quarter-final heats, our two designers are going head to head for that coveted place in the semi-finals. This time, the amateur designers have two rooms to transform in rather glamorous 1930s Art Deco flats and they will each have be handed a living room and a guest bedroom. The designers will again both have £2000 to be spent across their two rooms and 48 hours across three days in which to complete their challenge. They'll see their workforce doubled to two decorators and two builders and they really will find out how hard it is to have one room finished and judged on day two. This will be particularly challenging for one of the designers for whom a possible asbestos outbreak means work is halted in one of the rooms. The race really is on to get their rooms completed in time. Will they manage it and how will they adapt their design plans to comply with the Art Deco brief they've been handed. Will a black skirting board be a step too far for the clients and "mock croc" be too feminine for the "Gentleman's Club" they'd asked for? Meanwhile the other designer might be going too far off brief with a butterfly inspired effect which dominates heavily throughout the living room. Both designers will again be given a surprise element with the Creative Challenge to cleverly incorporate into their overall schemes and architectural historian Tom Dyckhoff takes us back in time and shows us that 1930s Streatham, meaning "Hamlet on the Street" was one of London's most forward futuristic glamorous neighbourhoods.