Check the air recirculation is not on. Even if the light is not on give it a press just in case. I had a problem with this and thought that the heater had packed up on my car as it was always steaming up. The problem was solved when I pressed that button. It was like this had got stuck on.
I also use Fog-X and it works wonders. My old MINI One was worst for it and always seriously misting up especially when it was raining and cold. My first day of ownership I almost couldn't see out on the motorway and at night - not good! I even took it back for this problem. They told me to put the air con on. I didn't have air con! Fog X cleared it up immediately. Its brilliant and even use it on the rear view mirror as this used to even fogged up. Just a MINI trait I guess! Not to bad with our current S but do it anyway cos its a good excuse to clean the windows!
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