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@Weegee There are a few shows like that which have likely helped in the states. Brit imports on Netflix may be a bigger general factor, but I think it's been growing steadily since the 70's.
https://books.google.com/ngrams/graph?content=chuffed&year_start=1800&year_end=2000&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cchuffed%3B%2Cc0