Hi,

reading this post reminded me of my rover 75 tourer cdti, i had the same problem, it turned out to be water ingress into the inbuilt sat nav system, which on the tourer is located in the rear wing, and they are known for leaks around the boot lid area, if it does not go to sleep it will drain a new fully charged battery within 8 hours. does your superb have a sat nav?

dobie

Do you have anything plugged in the boot power socket,??? her indoors left the cool box plugged in and flattened the battery on ours, ours is an 03 and still has the original one