Just to revisit this thread for information purposes, I had the tyre pressure warning come on this weekend. I've probably done around 5k miles I think (car is 4 months old now).
Anyway, checked all the tyres and they're all on 38; fuel cap says 41 but that doesn't sound right to me as the chances of all 4 tyres losing the same pressure at the same time is highly unlikely.
Reset the system via the 'Car' setting and now all is hunky dorey. Hopefully
