Just back from holiday and I've seen two examples of doing it right, both of which play cleverly with local pride.
First exhibit is Kent Crisps, "from the Garden of England" whose flavours include Oyster & Vinegar and Roast Beef & Spitfire Ale. Just the thing for a lazy afternoon in the sunny garden of the local pub.
Crossing over the Channel, we discovered Breizh Cola, although it's been around for the last decade. This is what is apparently known as an "Altercola", rather like Afri Cola here in Germany. No personalised bottles, though...
Maybe one day, even these regional products won't be specific enough. Can we expect to see Kentish Crisps and Crisps of Kent one day? Or even Finistere and Morbihan Colas? Or whatever the equivalents are in Breizh?