It's the grand final. Two of our best designers have battled their way to get here. Now just one can be crowned champion. Standing between them and the title, the challenge is to transform three rooms each in an apartment in a grand Stately Home in Sussex. Judging this epic battle, Sophie and Daniel will be joined by iconic interior designer Kelly Hoppen, who will be bringing her elite eye to all the final schemes. Nothing will escape all three judges' attention, so the battle will be fierce. In this high stakes challenge, one designer has a disastrous start, with their homeowner disliking all three schemes, and asking for a complete rethink. After all the prep that has gone into the designs, it will be an almost impossible task to turn things around. The other designer displays some clever ideas – like a silver leaf wall, and deconstructed furniture – but there are doubts from the judges that the schemes are bordering on safe, and elements of their designs are dubbed amateurish by their client, so the race for the title is far from over. Architectural historian Tom Dyckhoff will be exploring the estate, and explaining the wider significance Stately Homes have had on the British countryside. However, all eyes will be on the finalists, as they attempt to prove they are the best amateur designer in the country and deserve to be crowned winner of The Great Interior Design Challenge.