Come si dice in Inglese (Regno Unito)? How different are adjectives "posh", "chic" and "fancy" especially when you describe restaurants or cafes something like that? Examples would be a great help. (please ignore the template question)

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they more or less mean the same thing. "Posh" is a word that describes rich and upper class people (the origin is the initials of Port Out Starboard Home, the nicest cabins on cruise ships). So a posh restaurant might have magnificent wooden furniture, linen tablecloths, crystal glasses, traditional food like potatoes, beef and lobster, and very formal staff.
Chic is a French word we use to mean fashionable. So a chic restaurant would be more likely to have modern design, attractive young female staff and adventurous or foreign food. Fancy really just means out of the ordinary; either of the places I've described could be called fancy by an ordinary person, because they don't serve ordinary plain food in a basic way.