I just bought a 2006 Bentley Continental Flying Spur, and the cruise control feature does not work.
I searched the owner's manual fuse information and found a fuse that controls the cruise control braking but not a fuse that controls the actual cruise control system. I haven't changed the fuse yet. That leads me to believe if the car has a cruise control module, it may be faulty.
Any ideas that could help. It is a beautiful car with only 20,000 miles.

 

I think once you change your batteries (there are 2!) a lot of your problems will be corrected.