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In the last round of this heat, just two designers are left competing for one coveted spot in the quarter-final. They must transform awkward attic bedrooms in two desirable 1960s riverside homes in Marlow, Buckinghamshire. They'll have to be more creative than ever in these high-end properties, as they still have just 拢1,000, three days and a small team to help them transform their rooms.

Both designers are being stretched with very different schemes. One must deliver a modern bachelor pad-style room for the homeowners' twentysomething son, but while their ideas for geometric shapes and angular design go down well, their bright yellow and putty colour scheme raises many concerns. Meanwhile, the second designer is asked to create a hippy yet chic bedroom inspired by the colours of an Indian sari. When they come up with a multicoloured scheme with bulky pieces of bespoke furniture, doubt is cast on their ability. Can they turn it around?

Presenter and architectural historian Tom Dyckhoff looks back at the origins of this 20th-century housing development, and how it has roots firmly in the past of this industrious town. However, it's down to the judges to decide which designer has shown the potential talent to make it to the quarter-final, and which one will leave the competition.