Mary Berry left The Great British Bake Off out of loyalty to the BBC when the show moved from the BBC to Channel 4 in 2017. She chose not to follow the show to its new network, emphasizing her loyalty to the BBC because they had nurtured both her and the show from the beginning. She expressed that it was an honor to be part of the BBC, and she felt deeply connected to the organization that had supported her career. After leaving, she continued to work on various cooking shows produced by the BBC. Her departure marked the end of her seven-year involvement with the baking show.