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Didn't we have this a while back?
UK Spec cars only heat the mirrors when the mirror control switch is in the "Central" position - IE not able to adjust either mirror. If it is to the left or the right then they won't heat up. The rear demister does not need to be on for this to work.
Outside the UK, they work with the rear demister.....
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Mine work regardless of where the mirror adjustment is, I always leave the mirror switch pointing to the passenger side so I can adjust it down when parking, heaters work fine, maybe it's a Sportback trait?