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Probably before the other contestants had been selected. After all they had to ensure that all of the other couples had major faults and were not outstanding chefs! Chris was probably the best chef but Nathan was undoubtedly his achilles heel. Next best were The Twins but they were too fragile and his back trouble could make him unreliable under a heavy workload in a kitchen.
But a couple with an existing, successful drinks business in Covent garden........gold! As was seen throughout the series, the souschef did almost all of the cooking...what stories could he tell, I wonder.
Check the books, select the opposition, and, well , we know the result!