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Where have you ever seen 'm' used for miles? Wherever that is, go there and scribble it out! Also tell off the person who wrote it.

mph is the only acronym I've seen it used without mi.

It's used that way on highway signs in England, where it's very confusing.

I'm not sure it's very confusing. Context suggests that you're not going to be told how many metres you are away from London.

’orrifying.