I was messaging my MIL a few minutes ago (on something unrelated) and she said that the cornmeal she purchased was indeed labeled "cornmeal". I found it on Morrison's website (and Tesco, Asda, Sainsbury). It's a Caribbean brand called, "Island Sun Coarse Cornmeal". They also have one that's a fine grain. So, it does indeed exist. She lives in a town about 10 miles from Wigan so I imagine it's not too hard to find. But, it's on the major chain's websites for under £1 for 500g so it's worth a try.
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