The Aztec seems to be Cadbury's embarrassing relative. Until a couple of years ago they showed ONE wrapper in the advertising section at Cadburyworld. And now... nothing at all. Perhaps it's buggered off to Poland with the rest of their manufacturing facilities.
Granted, Aztec might have been Cadbury's desperate "me too!" attempt at a Mars bar, but they were still pretty good with a nice chewy malty hit, and I can't see why they're so ashamed.
Rant over.