In spoken BrE the word "pound" is sometimes colloquially used for the plural as well. For example, "three pound forty" and "twenty pound a week" are both heard in British English. Some other currencies do not change in the plural; yen and rand being examples. This is in addition to normal adjectival use, as in "a twenty-pound-a-week pay-rise" (US "raise"). The euro most often takes a regular plural "-s" in practice despite the EU dictum that it should remain invariable in formal contexts; the invariable usage is more common in Ireland, where it is the official currency.