Erklärung siehe oben, hat also mit Minibar im Hotelzi. nichts gemeinsam

wird auch "honesty bar" genannt;
honesty bar = Bar mit Konsum nach dem Ehrlichkeitsprinzip;
honour bar = Es geht um ein Hotel/Restaurant/Kneipe in einer ehemaligen Bank: "vaults now host nothing more valuable than an honour bar";
Ist damit vielleicht so eine Selbstbedienungs-Bar gemeint, wo man dem Gast das Vertrauen entgegen bringt, selbstständig und freiwillig den korrekten Betrag für die entnommenen Getränke zu hinterlegen? Einige Resultate der Webrecherche ließen mich so was vermuten;
das wäre zwar eine honesty bar
Siehe Wörterbuch: honesty
aber vielleicht hast Du trotzdem recht;
Well if you trust children not to cheat, that is called the honor system (in the US) so I would imagine an honour bar to be one where you paid for what you drank on the honor sytem. But that is really only a rather wild guess;
Selkie, honor system is AE and honesty system is BE as I've just found out.
An honor system or honesty system is a philosophical way of running a variety of endeavors based on trust, honor, and honesty. Something that operates under the rule of the "honor system" is usually something that does not have strictly enforced rules behind its functioning. In British English, it would more often be called a "trust system" and should not be confused with the British honours system.

The honor system is a system granting freedom from customary surveillance (as to students or prisoners) with the understanding that those who are so freed will be bound by their honor to observe regulations <prison farms operated under the honor system>.[1]
A person engaged in an honor system has a strong negative concept of breaking or going against it. The negatives may include community shame, loss of stature, loss of a personal sense of integrity and pride or in extreme situations, banishment from one's community.
Some hotels, mostly in continental Europe, operate an honor bar, allowing guests to serve and record their own drinks and saving the cost of a night bartender. Patrons could theoretically lie about their drink consumption, and the hotel would have only limited powers to verify their claims. The concept of hotel "mini bars" in the United States and Canada is similar, although the stock is quantified more carefully, making it difficult to lie.
http://en.wikipedia.org/wiki/Honor_system