It's the first of the two quarter-final programmes and three previous winners battle it out for two places in the semi-final. This time they have three days and a larger budget of £1,200 to redesign quirky, open-plan rooms in an architecturally significant 1960s housing complex. All three designers must prove that they have imagination, skill and style if they're to win a coveted place in the semi-final of the Great Interior Design Challenge.