@Declan *********
true, but there's a notable exception: if any immigrations offices interpret (centrally defined) rules wrongly, and publish it wrongly, they can still adhere to the rules they publish because they decide (and they have discretionary rights to decide otherwise than centrally defined). Embassies informing on visas, same thing. However, embassies informing on visa exemption matters, different story: now any interpretation errors do not carry over to actual entry decisions. Although this would normally warrant extra attention for accuracy, this is unfortunately not how it plays out. Embassies (some at least) are taking their responsibility too lightly and publish rules that are neither centrally defined nor common practice. Quite bad.