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It's the first of the three second-round episodes and three previous winners battle it out to win a place in the quarter-finals. This time, each of our amateurs takes on awkward dimensions in three bedrooms in converted oast houses in Kent.

In a boy's bedroom, mum-of-three Kelly creates one of the boldest schemes yet - with vibrant colours and quirky touches - but has she got her details right? Brimming with ideas, teashop owner Kate goes all out with an ambitious red and blue scheme, but she must learn to make sure that every aspect of her design is functional. And fashion graduate Alex must find a way to incorporate his homeowner's American football memorabilia into his restful, grown-up guest room.

While architectural historian Tom Dyckhoff delves into the fascinating history of these buildings, shaped by their agricultural heritage, judges Sophie Robinson and Daniel Hopwood keep a watchful eye over progress in the rooms.

The designers have just three days and 拢1,000 to demonstrate their skills and inventiveness - but with two places in the quarter-finals up for grabs, one of them will leave the competition at the end of this challenge.