The new cohort of interior designers tackle their first challenge, demonstrating their signature style on YHA bunk rooms in the Lake District.

The nine designers demonstrate sustainable design by transforming shipping containers into offices in Bristol for start-ups using recycled and repurposed materials.

The eight designers pair up to transform luxury retirement apartments in Portsmouth, using their home staging skills to attract baby boomers into buying their forever home.

The designers create a home from home for dogs at Battersea. Sue Perkins helps Michelle judge these transition rooms along with a couple of Pomeranian rescues.

The designers must create premium hospitality suites at Twickenham for diehard rugby fans by producing a swanky bar and a stylish dining area.

The designers hit the high street, doing up shops in Rye. Working in teams, they transform an Indian paper shop and a women’s boutique before being critiqued by Mary Portas.

The three semi-finalists need to put on their best performance as they head to Edinburgh to transform Festival Fringe venues for a place in the final.

The finalists transform holiday cottages in the whimsical and colourful village of Portmeirion before one of them wins Interior Design Masters and a contract with John Lewis.