Of course the most frequently occurring euphemism in the US is "bathroom" as in "go to the—". It makes a bit more sense here than in the UK; at least our bathtubs and toilets are usually in the same room. But I have heard people say, out of habit, "go to the bathroom" in a public place such as an airport, where there are no bathtubs at all, and hence no bathrooms as such. In public places, the standard term is "restroom" although nobody really goes there to rest. (I wonder what architects and plumbers call the room?)

In America, we use "toilet" to mean the porcelain fixture, but not the room where it is located. I believe in the UK, it means the room as well. Am I right?