I confess that I've never heard anyone British pronounce chorizo that way. It always comes out as a comedy (I use the word advisedly) Allo Allo accent. Once in Bingley our waitress did a rather splendid chor-IT-toh! which was delivered with such verve that I feared she was about to fight a bull or commence the flamenco mid-order. I can't really capture it though, because it was also in broad Yorkshirese. She didn't, unfortunately, start dancing and singing and the only bovine was plated.
Come to think of it, I'd like to hear Italians Talk Cockney, the first of my podcasts in Making Foreigns Talk Proper series.