It is the grand final. Two of our best designers have battled their way through sweat and tears to get here. Now just one can be crowned the champion and winner of The Great Interior Designer Challenge.

However, the amateurs find it harder than ever to win that coveted title, as in their biggest challenge to date, they have to complete three rooms each in converted apartments in an 18th-century mock castle in Broadstairs. The designers have 72 hours across four days in which to complete their rooms but this time their teams are bigger and they will have a larger budget of £4,000 each. However the designers are tackling and taking on a kitchen for the first time ever and our designers soon find out that working in older properties is certainly not without its challenges.

Judging this epic battle are Daniel Hopwood and Kelly Hoppen, helped and joined by former judge and interior stylist Sophie Robinson. Nothing escapes these three, so the battle is intense. Both the designers are tested to the max, clients are exacting, demands are challenging and for the designers there is more than just a trophy on the line.

Architectural historian Tom Dyckhoff explores the castle and explains the significance of such a beautiful building in British history.

All eyes are on the two finalists, as only one can walk away as winner of The Great Interior Design Challenge. Show less