It's the fourth of our nine heats as three new designers battle it out for a place in the second round and the chance to win The Great Interior Design Challenge. This time our amateurs will be updating a crooked bedroom in three grand medieval homes in Lavenham, Suffolk. Architectural historian Tom Dyckhoff discovers the history of the houses, and Judges Sophie and Daniel decide who will go through to the next round. Each designer has three days, £1000 and the help of a small team to achieve a 21st century take on the 600 year old rooms. Furniture restorer Scott faithfully follows his homeowners East meets West brief, but will he show enough originality to impress the judges? Mum of two Leila hopes her luxurious yellow scheme will bring some much needed light to her room, even though her homeowner isn't keen on the colour. And tea shop owner Kate goes all out with her British colonial theme – but will it suit the 300 year old room? With original wooden beams, uneven floors and discerning homeowners, the three would-be designers have their work cut out – and only one of them can go through to the next round.