Do the rear pads have wear electronic indicators or is it purely keeping an eye on them?
I ask because when I had my yearly service back in March they said I would need rear pads probably in the next few thousand miles - for me this could be 3-6 months - although of course they wanted them booked in straight away.
Looking today it was hard to tell - maybe I had 3-4mm but I don't want to leave them too long - what's the minimum pad thickness we are comfortable with?