But there's still hope for one of them. We've asked you to vote for the best of the rest; the runner up you believed was dealt an unfair hand.
Voting has now closed. Thank you to everyone that voted.
Tune in to The Big Idea final this Saturday (25th November) at 9pm on Sky One to see which of our 30 runners up won that coveted seventh place in the final.
Neil Mackay & Richard Starrett
Jason Rowles and Stuart Cook
Geoff Jackson and Rachael Upton
Gary McMahon and Colin Gray
Stephen Richards and Roger Bold