Four chefs compete for the central region with canapes, starters and fish dishes inspired by British invention and innovation. With a surprise extra judge, who will be eliminated?

The remaining chefs prepare mains and desserts inspired by science and innovation. But when two chefs both decide to make layered chocolate dishes, who will win and who must go home?

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?

Four chefs compete for Scotland with canapes, starters and fish dishes inspired by British invention and innovation. With veteran chef Tom Brown, who will be eliminated?

The remaining chefs compete over main and dessert dishes inspired by science and innovation, particularly Scotland’s legacy of inventions. But who will win, and who must go home?

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.

Four top chefs compete for the London and the South East region with canapes, starters and fish dishes inspired by British invention and innovation.

The remaining chefs compete over dishes inspired by science and innovation. But with such high-level cooking, who can keep their lead and who must go home?

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?

Four chefs compete for Wales with canapes, starters and fish dishes inspired by British invention and innovation. Who will be eliminated?

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?

Four chefs compete for the North East, Yorkshire and Humber region with canapes, starters and fish dishes inspired by British invention and innovation.

The remaining chefs compete over mains and desserts inspired by science and innovation. But with such high-level cooking, who will finish in front and who must go home?

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?

Four top chefs compete for Northern Ireland with canapes, starters and fish dishes inspired by British invention and innovation. But who will be eliminated?

The remaining chefs compete over dishes inspired by science and innovation, drawing especially from Northern Ireland’s legacy of inventions. But who will win and who must go home?

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?

Four chefs compete for the North West of England with canapés, starters and fish dishes inspired by British invention and innovation.

The remaining chefs compete with dishes inspired by British invention and innovation, but which two chefs will go through to the judges’ chamber and who must go home?

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.

Four chefs from the south west of England compete, with canapes, starters and fish dishes inspired by British invention and innovation. Who will be eliminated?

The remaining chefs compete over dishes inspired by science and innovation from the south west of England, but who will win and who must go home?

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.

Andi Oliver presents the series finale – an outdoor banquet celebrating British innovation and invention. The star-studded guests must vote for the overall winning chef.