[Stuart]

I'm not sure what you mean.  Nothing I have suggested is duplicated or given scope for misinterpretation.

For example, EMid and WM are easier to tell apart than EM and WM.

Not if you can read, and that's what you're looking for on Freesat.  On Sky/Freesat it's irrelevant, as you'll get the correct region anyway on 101.

If you're scanning for some other region, then quite honestly EM couldn't mean anything else in the UK. To say otherwise is somewhat ridiculous.

I can tell the difference between SW, NE, WM, EM, SE, NW . . . I doubt there are many people who can't.