When you go into most coffee bars, in England and order the following coffee:
Anyway I digress.
Most places where I order an Americano actually give me an Australian long black. On first glance this seems the same, but I can assure you, the taste is different.
I was in one of the larger chains and mentioned the difference and was told, yes, we know, but this is much easier to make, and it does give a stronger flavour.
So, in a nutshell, if your shop sells you a Long Black instead of an ordered Americano, don't complain... it has a stronger flavour!