Guest judge Helen Sharman, Britain’s first astronaut, helps decide the winner from the two remaining chefs. Both have dishes themed around space, but whose will rocket them to success?

With delicious dishes celebrating Scotland’s landmark inventions, who will be judged the winner for Scotland? The judges, including bestselling author Caroline Criado-Perez, must decide.

Guest judge Professor Chris Jackson, geologist and adventurer, helps decide the winner from the two remaining chefs. Both have pioneering dishes, but whose will rocket to success?

Two top chefs from Wales go head-to-head with dishes celebrating Welsh produce, Welsh entrepreneurs and pioneers in their fields. But who will come out on top?

Guest judge Sophie Conran, cook, author and designer, helps decide the winner from the two remaining chefs. Both have truly pioneering dishes but who will take the crown today?

Guest judge and legendary designer Thomas Heatherwick helps decide the winner from the two remaining chefs. Both have pioneering dishes, but whose will rocket them to success?

Who will be judged the winner of the North West of England with delicious dishes celebrating invention? The judges, including one of Britain’s best loved designers, must decide.

Who will be judged the winner for the south west of England with innovative dishes inspired by the region’s inventions? The judges, including a modern-day madcap inventor, must decide.

The eight regional champions cook their starter courses in a bid to secure a place on the menu of a banquet celebrating British innovation. Comedian Phil Wang is the guest judge.

The eight regional champions cook their fish courses to win a place on the menu of a banquet celebrating British innovation. Engineer and TV presenter Zoe Laughlin is guest judge.

The eight regional champions cook their main courses in a bid to secure a place on the menu of a banquet celebrating British innovation. Carol Vorderman is the guest judge.

The eight regional champions cook their main courses in a bid to secure a place on the menu of a banquet celebrating British innovation. Carol Vorderman is the guest judge.