The Great Interior Design Challenge

The amateur designers must transform a bedroom in a modernist former leisure center in south London.

The three remaining designers are out to impress, working in Kentish weatherboard cottages; each building is grade II listed, with individual restrictions on what can and can't be changed.

The backdrop for this showdown is an 18th-century Scottish Castle, now converted into apartments.

Another group of amateur designers will compete across three knock-out rounds for one place in the quarter-final; engineering manager Rob, DIY store worker Angelica, ex-visual merchandiser Sarah and textiles lecturer Lucy.

The remaining designers work on Georgian terraces in living rooms in high-end homes in Bath.

In the last round, two designers compete for a spot in the quarter final by transforming two small bedrooms in timber-framed houses.