Double Decker: remembered fondly, but memory is a deceptive mistress. A recent sampling revealed it to be both artificial tasting and a crude snack experience. It's all too easy to graze your gums on that hard base, after the soft-nougat follow-through. Consign to the memory drawer, and move on.
The process for making Cadbury Flake is a closely guarded secret and no other chocolate manufacturer has ever managed to recreate it. That's why no other chocolate bar can rival the delicate, crumbly texture of a Cadbury Flake.