Funnily enough, I know some people at CBS News in London, and after seeing this thread I asked them about the fish n' chips story. The story in the link was done in New York, so the London bureau didn't have anything to do with it, but their response after hearing the "312 times a year" line was "that's ridiculous."
My guess (and it's just a guess) is they'll call their counterparts in New York and either 1) there's a real basis in fact for the number along the lines of what Karrit suggested, or 2) whoever produced the piece didn't do their math right, and the piece will get corrected or pulled off the website or whatever they do when there's a mistake in a story.